Greenhouses can get pretty hot in the summer months, so you should never put your greenhouse thermometer in direct sunlight, or you will get a false reading of how warm it actually is in there.

A greenhouse thermometer helps to monitor and record the greenhouse’s temperature accurately. This is important because plants are sensitive to temperature changes; even small fluctuations can affect their growth and health. As mentioned, a lot of digital thermometers will provide max/min temperature readings as well as the current temperature. But why is this useful? One of the most common issues with greenhouse thermometers is inaccurate readings. This can happen due to various reasons such as a malfunctioning thermometer, incorrect placement of the thermometer, or interference from external factors such as direct sunlight or drafts. You need to take accurate records of both the temperature and humidity levels on a daily basis. That way you can keep humidity levels around 50-70% relative humidity and act fast if your greenhouse steams up. The records should be taken throughout the day and night. You can achieve that only with a good thermometer and hygrometer.

My Top Recommended Greenhouse Thermometers

It’s robust in its simplicity, and its green ABS plastic case has a water and dust resistance rating of IP65 – this makes it suitable for use outside in the greenhouse as well as indoors. IP65 is considered both dust tight and protected from ‘low pressure jets’; as result, it should stand up against humidity, rain and even the odd accidental splash from the hose. It does let you to remotely monitor the temperature and humidity levels 24/7 from your phone, tablet or a computer. This is a really nice feature, as it gives you a snapshot of what happened last night in the greenhouse, even if you forget to reset the max-min. The ThermPro is my choice for the best greenhouse thermometer and hygrometer. It has many of the same features as my simpler choice earlier but with the added hygrometer. It has a white plastic casing, described as ‘water resistant’. Most customers seem to have found this description accurate, and that the thermometer is not easily affected by small amounts of moisture, be that light rain, or humidity inside the greenhouse.

In terms of accuracy which is (+/-1 F and +/- 2-3% RH) I prefer something a little bit higher (the next product). Overall this device has a good performance. Avoid using water or harsh chemicals that can damage the thermometer. Additionally, store the thermometer in a dry and cool place when not in use to prevent damage from extreme temperatures or moisture. Thanks to the weather resistant plastic construction, you can be sure that you’re buying a durable piece of equipment. Like all great models, this particular thermometer has a large and easy to read display. What’s more, the OutdoorHome thermometer automatically shows the latest maximum and minimum temperatures both in Celsius and Fahrenheit. And as a bonus, it even records the daily temperatures for future reference. What I like about it: Thermometers come in two varieties: traditional and Wireless models. Traditional thermometers are the more straightforward analog liquid or big numbers for readings. They are used to measure the temperature of a greenhouse, and they typically do not have any other features. This is an excellent affordable option when starting. Wired Indoor/Outdoor Thermometers And HygrometersCompared to the small Brannan Greenhouse Thermometer, the ThermoPro TP50 is capable of measuring a much larger range of temperatures, from -50°C to 70°C, and it can display its readings in either Celsius of Fahrenheit. Range: The thermometer should be able to measure the temperature range that you require for your plants. For taking basic temperature readings, look for a wireless digital thermometer that shows min/max temperature data as well as the current temperature. Thermometers that show maximum and minimum temperature over a certain period are really useful, as these allow you to see how much temperature variation your plants are experiencing. You can then plan ahead to keep your greenhouse’s temperature more consistent.

A humidity level indicator is an essential tool for greenhouse owners. It helps you monitor the relative humidity in your greenhouse and ensure it stays within the desired range. Temperature Monitor theraingauge.com Keeping a close eye on the temperature inside your greenhouse is vital for the health of the plants. Certain plants require different temperatures to flourish, and if the greenhouse is too hot or too cold, they will struggle to carry out necessary processes like photosynthesis. Digital displays are easy to immediately interpret, and they are clear and easy to read. Thanks to the nature of the digital instrument, it’s easy to buy a digital thermometer that displays a variety of data, not just the current temperature. There are digital greenhouse thermometers that will display the maximum and minimum temperatures over a period of time, as well as the humidity.If you are a gardening lover and are planning to invest in something special rather than just a thermometer, this tool is for you.