Greenhouse Thermometer: A Buyer’s Ultimate Guide

Suppose you’re venturing into the world of greenhouse gardening. In that case, you’re likely aware of the critical role that precise temperature control plays in nurturing your plants. It’s no secret that greenhouses can be delicate ecosystems, where even minor temperature fluctuations can impact the health and growth of your crops. This is where a greenhouse thermometer come into play.

This humble device is crucial in monitoring and controlling the climate within your greenhouse, ensuring your plants thrive in optimal conditions. A greenhouse thermometer comes in various types, each with unique features and benefits. From traditional analog thermometers to advanced digital and infrared models, the choices are vast. But how do you decide which one is the best fit for your needs?

Let’s dive into the world of greenhouse thermometers with this comprehensive guide. We will explore their significance, the available types, and factors to consider when choosing one. At the end of this journey, you will be fully equipped to make an informed decision when selecting the perfect greenhouse thermometer for your needs.

Understanding the Importance of A Greenhouse Thermometer

Before going into the intricacies of greenhouse thermometers, it’s essential to recognize their fundamental significance in greenhouse gardening.

Temperature profoundly impacts every facet of plant growth and development. Greenhouse thermometers are indispensable aids for growers, facilitating precise temperature monitoring and control, thus fostering thriving crops.

By tracking temperature fluctuations, growers can swiftly detect potential issues and take corrective measures. For instance, during cold spells, heaters can be activated to shield crops from frost, while in sweltering conditions, vents and fans come to life to cool down the greenhouse.

Greenhouse thermometers enable growers to maintain the optimal growing conditions necessary for healthy plant growth and development. The result? Increased yields and a bounty of high-quality produce.

Precise temperature control emerges as a pivotal factor, particularly for specific greenhouse crops like tomatoes, which thrive within the temperature range of 65-75 degrees Fahrenheit for optimal fruit production. Deviations from this range can significantly impact fruit yields and quality.

In essence, greenhouse thermometers are not mere tools; they are guardians of ideal conditions, ensuring that crops receive the nurturing environment they require to flourish. Now that we’ve understood the significant role of greenhouse thermometers let’s discuss selecting the perfect one for your unique needs.

How to Choose the Right Greenhouse Thermometer

Choosing the perfect greenhouse thermometer is similar to selecting the right tool for a job. Several factors must be carefully considered for successful greenhouse ventures.

Factors to Consider when Choosing a Greenhouse Thermometer:

Important factors to consider for your greenhouse thermometer

1. Type of Thermometer: The first decision you’ll face is the type of thermometer that best suits your requirements. Will you opt for a digital thermometer, known for its precision, or an analog thermometer with a more traditional charm? Are you in need of an indoor or outdoor thermometer? Each type comes with its advantages and disadvantages.

2. Accuracy and Precision: One of the foremost qualities to look for in a greenhouse thermometer is accuracy. Even a slight temperature variation can have a significant impact on plant growth. Precision is equally vital, ensuring that you can pinpoint temperature changes with accuracy.

3. Durability and Reliability: Greenhouse environments can be challenging, with fluctuating humidity levels. Your thermometer should be built to withstand these conditions and provide reliable readings consistently.

4. Additional Features: Some greenhouse thermometers have additional features like humidity sensors or alarms. These can be valuable tools for a more comprehensive understanding of your greenhouse environment.

5. Price: Finally, your budget will play a role in your decision. Investing more in a quality thermometer pays off by ensuring plant health and productivity despite cheaper options being tempting.

Now that we’ve covered the essential factors let’s move on to the practical aspects of using a greenhouse thermometer effectively.

How to Use a Greenhouse Thermometer Effectively

It’s crucial to understand proper usage to make the most of your greenhouse thermometer. Here’s a concise guide to help you master this essential tool.

1. Proper Placement of the Thermometer:

To get accurate readings, the placement of your greenhouse thermometer is critical. Follow these tips:

  • Hang it at Plant Level: Position the thermometer at the same height as your plants. This ensures you measure the temperature they experience, not the air above them.
  • Avoid Direct Sunlight: Protect your thermometer from direct sunlight, which can distort readings. Please place it in the shade or use a model with a sun shield.
  • No Drafts or Heat Sources: Keep the thermometer away from doors, windows, or heaters. Drafts and artificial heat sources can lead to inaccurate readings.

2. Reading and Interpreting the Thermometer:

Understanding the numbers on your thermometer is essential. Here’s how to read and interpret them effectively:

  • Fahrenheit or Celsius: Ensure you’re reading the correct temperature scale (Fahrenheit or Celsius) based on your preference.
  • Know Your Plant’s Preferences: Different plants have specific temperature preferences. Research your plant species to determine its ideal temperature range.
  • Monitor Daily Fluctuations: Greenhouses often experience temperature fluctuations throughout the day and night. Observe these changes to gain insights into your greenhouse’s microclimate.
  • Watch for Extremes: Extreme temperatures, either too high or too low, can harm your plants. Take action if your thermometer indicates danger.

3. Keeping the Thermometer Clean and Calibrated:

Maintenance is vital to the accuracy of your greenhouse thermometer. Here are some essential tips:

  • Regular Cleaning: Dust can build up on or around the sensor and affect accuracy. It’s essential to clean it periodically using a soft cloth or gentle cleaning solution.
  • Calibration Checks: Ensure your thermometer remains accurate by occasionally comparing it to a calibrated reference thermometer. Calibration ensures precise readings.
  • Battery Check (Digital Thermometers): If you use a digital thermometer, check the battery status regularly. Low batteries can lead to inaccurate readings, so replace them as needed.

By following these guidelines, you’ll become a greenhouse thermometer expert equipped to monitor and maintain the ideal temperature for your cherished plants.

Common Mistakes When Using a Greenhouse Thermometer

It’s essential to avoid these common pitfalls to ensure your greenhouse thermometer serves its purpose effectively. Let’s explore these mistakes that can compromise the accuracy of your temperature monitoring.

1. Not Placing the Thermometer in the Right Location:

Improper placement of your greenhouse thermometer can yield misleading readings. To avoid this mistake, hang the thermometer at the same height as your plants, ensuring you measure the temperature they experience.

2. Not Reading the Thermometer Correctly:

Misinterpreting your greenhouse thermometer is another frequent error. Even a slight temperature change can have a significant impact on the health of plants. To read it accurately, ensure you’re using the correct temperature scale, familiarize yourself with your plant species’ temperature preferences, and monitor daily temperature fluctuations.

3. Not Calibrating the Thermometer Regularly:

Over time, even the most reliable thermometers can drift, leading to inaccurate readings. Neglecting calibration is a common mistake. To maintain precision, periodically compare your thermometer to a calibrated reference thermometer.

4. Not Cleaning the Thermometer Regularly:

Dust and grime can accumulate on your thermometer’s sensor, affecting its accuracy. Neglecting cleaning can lead to unreliable data. To keep your thermometer in top shape, clean it periodically with a soft cloth or a gentle cleaning solution.

By avoiding these common mistakes, you’ll maximize the effectiveness of your greenhouse thermometer, providing your plants with the ideal temperature conditions they need to thrive.

Different Types of Greenhouse Thermometers and Their Pros and Cons

There are many different types of greenhouse thermometers available, each with its own advantages and disadvantages. Here is a brief overview of the most common types:

1. Digital thermometers

Digital thermometers are the most accurate and reliable type of greenhouse thermometer. They are also the easiest to read and interpret as they display the temperature in large, precise numbers. Digital thermometers come in various styles, including wall-mounted, freestanding, and probe thermometers.

  • Pros:
    • Accurate and reliable
    • Easy to read
    • Available in a variety of styles
  • Cons:
    • More expensive than other types of thermometers
    • May require batteries

2. Analog thermometers

This type of thermometers is less expensive than digital thermometers, but they are also less accurate and more difficult to read. Analog thermometers come in various styles, including minimum/maximum thermometers and hygrothermograph.

  • Pros:
    • Less expensive than digital thermometers
    • Do not require batteries
  • Cons:
    • Less accurate than digital thermometers
    • More complex to read
    • May be fragile

3. Indoor thermometers

Indoor thermometers are designed to measure the temperature inside a greenhouse. They are typically placed at the center of the greenhouse, at plant height.

  • Pros:
    • Measure the temperature inside the greenhouse
  • Cons:
    • Do not measure the temperature outside the greenhouse, which can be important for monitoring microclimates

4. Outdoor thermometers

Outdoor thermometers are designed to measure the temperature outside a greenhouse. They are typically placed on the north side of the greenhouse, away from direct sunlight.

  • Pros:
    • Measure the temperature outside the greenhouse, which can be important for monitoring microclimates
  • Cons:
    • Do not measure the temperature inside the greenhouse, where the plants are

5. Maximum/minimum thermometers

Maximum/minimum thermometers record the highest and lowest temperatures that occurred over some time, typically 24 hours. This can help identify temperature fluctuations that may not be apparent when only reading the current temperature.

  • Pros:
    • Record the highest and lowest temperatures over a while
  • Cons:
    • Less accurate than digital thermometers
    • More complex to read

6. Hygrothermograph

Hygrothermographs are a combination of thermometers and hygrometers that measure temperature and humidity. This can help maintain optimal growing conditions for certain plants, such as orchids and ferns.

  • Pros:
    • Measure both temperature and humidity
  • Cons:
    • Less accurate than digital thermometers
    • More complex to read
hygrothermograaph for greenhouse

7. Smart greenhouse thermometer

Smart greenhouse thermometers are a new type of thermometer that uses wireless technology to transmit temperature data to a smartphone or computer. This allows growers to monitor temperature remotely and receive alerts if the temperature goes outside of the desired range.

  • Pros:
    • Wireless technology allows for remote monitoring
    • Can send alerts if the temperature goes outside of the desired range
  • Cons:
    • More expensive than other types of thermometers
    • May require a smartphone or computer for remote monitoring
smart automatic greenhouse thermometer

Which type of greenhouse thermometer is right for you?

Choosing the right thermometer for your greenhouse depends on your specific needs and budget. For the most accurate and reliable temperature readings, a digital thermometer is the way to go. If you’re trying to keep costs down, an analog thermometer may be a more practical option. If you need to track both temperature and humidity, a hygrothermograph would be a great choice. And if you’re looking to monitor temperature from a distance, an intelligent greenhouse thermometer is the perfect solution.

Top Greenhouse Thermometer Brands and Models

When maintaining the perfect climate in your greenhouse, choosing a suitable thermometer is crucial. Here are some of the top greenhouse thermometer brands and models that are popular among gardening enthusiasts:

  1. Thermometer World’s Maximum/Minimum Thermometer: The Classic Design Max Min Thermometer is a digital thermometer that is suitable for both indoor and outdoor use. It has a flip-out roof for extra protection from the elements and comes with a 1 AAA battery included. The thermometer is very accurate and is ideal for greenhouse use. It is also backed by exceptional customer service from Thermometer World.
  2. DOQAUS’ Indoor Thermometer: The DOQAUS Indoor Thermometer Hygrometer is a highly accurate and easy-to-use device that provides precise temperature and humidity readings every 5 seconds. It features a large, easy-to-read LCD display, a comfort indicator, and multiple mounting options. The included CR2032 battery is built to last, and DOQAUS provides excellent customer support.
  3. ThermoPro’s Indoor/Outdoor Wireless Thermometer: The ThermoPro TP55 Wireless Thermometer is a waterproof and highly accurate thermometer with a fast response time and a 500-foot remote range. It can monitor environmental conditions in up to 4 locations with additional temperature sensors. The remote sensor is cold-resistant and features a rechargeable lithium battery. The thermometer has an easy-to-read backlit LCD display and multiple placement options.
  4. Smartro’s SC92 Digital Thermometer: This model stands out for its highly accurate readings and outstanding durability against extreme temperatures, making it a top choice for digital greenhouse thermometer.
  5. Govee’s Bluetooth Thermometer: This smart greenhouse thermometer provides readings for your phone via a compact sensor. It’s an excellent choice for tech-savvy gardeners.

Remember, the best greenhouse thermometer for you depends on your specific needs and preferences. When choosing a model, prioritize the features that are important to you.

How to troubleshoot problems with your greenhouse thermometer

Greenhouse thermometers can be essential tools for greenhouse growers, but they can also be prone to problems. Here are some common issues and their solutions:

Common problems and their solutions

  • Inaccurate readings: If your greenhouse thermometer is giving inaccurate readings, there are a few things you can check. First, make sure that the thermometer is placed in the correct location. Thermometers should be placed away from direct sunlight and heat sources. Second, check to make sure that the thermometer is clean. It’s essential to remember that dirt and dust accumulation on the thermometer can impact its precision and accuracy. Finally, calibrate the thermometer according to the manufacturer’s instructions.
  • Broken thermometer: If your greenhouse thermometer is broken, there is no easy fix. You will need to replace the thermometer.
  • Battery failure: If your greenhouse thermometer is battery-powered, ensure the batteries are fresh. Dead batteries can cause the thermometer to give inaccurate readings or stop working.
  • Wireless connection problems: If you have an intelligent greenhouse thermometer, ensure it is correctly connected to your wireless network. If you’re experiencing connectivity issues, consider rebooting your router or modem to see if that resolves the problem.

Tips for preventing problems

Here are a few tips for preventing problems with your greenhouse thermometer:

  • Choose a durable thermometer: When choosing a greenhouse thermometer, look for a model that is durable and can withstand the elements.
  • Place the thermometer in the correct location: Place the thermometer away from direct sunlight and heat sources.
  • Keep the thermometer clean: Clean the thermometer regularly to remove dirt and dust.
  • Calibrate the thermometer regularly: Calibrate the thermometer according to the manufacturer’s instructions.
  • Replace the batteries regularly: If you have a battery-powered thermometer, replace the batteries regularly to avoid dead battery problems.
  • Check the wireless connection regularly: If you have an intelligent greenhouse thermometer, ensure it is appropriately connected to your wireless network.

By following these tips, you can help prevent problems with your greenhouse thermometer and ensure that you are getting accurate readings.


In this guide, we’ve ventured into the fascinating world of greenhouse thermometers, uncovering their indispensable role in nurturing your cherished plants. As you wrap up your journey through these insights, remember these key takeaways:

  • Precision Matters: A greenhouse thermometer isn’t just a tool; it’s your plants’ guardian. Accurate temperature control is the bedrock of successful greenhouse management.
  • Choosing Wisely: Select the thermometer type that aligns with your needs, whether digital, analog, indoor, outdoor or even a smart thermometer. Your choice can make all the difference.
  • Mastering Usage: Proper placement, accurate readings, regular calibration, and routine cleaning are essential for getting the most out of your thermometer.
  • Avoiding Common Pitfalls: Correct mistakes like improper placement, misreading, neglecting calibration, and infrequent cleaning to maintain precision.

Now, armed with this knowledge, you’re equipped to make an informed choice when purchasing your greenhouse thermometer. Your plants will thrive under your watchful eye, thanks to the precise temperature control your thermometer provides. Happy gardening!

Frequently Asked Questions (FAQs)

Q1: What is a greenhouse thermometer?

A greenhouse thermometer is a device used to measure the temperature inside a greenhouse. It is an essential tool for greenhouse growers, as it allows them to monitor and control the temperature of their greenhouse environment.

Q2: Why is temperature control important in greenhouse management?

Temperature is a critical factor in plant growth and development. Greenhouse growers need to maintain optimal temperatures for their crops to thrive. Too high or too low temperatures can lead to a variety of problems, such as stunted growth, poor flowering, and disease susceptibility.

Q3: What are the different types of greenhouse thermometers available?

There are many different types of greenhouse thermometers available, including:

  • Digital
  • Analog
  • Indoor and outdoor
  • Maximum/minimum
  • Hygrothermographs
  • Smart thermometers

Q4: How do I choose the right greenhouse thermometer for my needs?

When choosing a greenhouse thermometer, consider the following factors:

  • Accuracy and precision
  • Durability
  • Price
  • Features
  • Specific needs of your greenhouse

Q5: How do I use a greenhouse thermometer effectively?

To use a greenhouse thermometer effectively, follow these tips:

  • Place the thermometer in a location where it will be exposed to direct sunlight.
  • Read the thermometer at the same time each day.
  • Keep the thermometer clean and calibrated.

Q6: What are some common problems with greenhouse thermometers?

Some common problems with greenhouse thermometers include:

  • Inaccurate readings
  • Broken thermometers
  • Battery failure
  • Wireless connection problems

Q7: How can I prevent problems with my greenhouse thermometer?

To prevent problems with your greenhouse thermometer, follow these tips:

  • Choose a durable thermometer.
  • Place the thermometer in the correct location.
  • Keep the thermometer clean.
  • Calibrate the thermometer regularly.
  • Replace the batteries regularly (if battery-powered).
  • Check the wireless connection regularly (if smart thermometer).
grant yost greenhouse innovator

Grant Yost

Grant Yost is co-owner of Beulah Land Farms, a small business that is part of and trying to push forward the local food movement. Although I grew up on a farm in the middle of Kansas, we took the wheat and other grain to the elevator, and then went to the grocery store to buy all our food. Maybe it's a generational thing, but we should be growing our own food as much as possible! My wife was diagnosed with Graves disease, which is an auto-immune disease affecting the thyroid, and while it wasn't debilitating (we are grateful for that) we have to wonder if it had to do with processed food and our mass-produced food supply. Auto-immune epidemic anyone? Also, maybe a generational thing... we live in the city in Kansas City, but our kids want to move to the farm!

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