WEATHERmeter Reading Accuracy

WeatherFlow Smart WEATHERmeters are designed to be the best handheld weather devices on the market. They are affordable and accurate. Technical specifications for the WINDmeter can be found here. Technical specifications for the WEATHERmeter can be found here.

If you feel that your meter is not reading accurately, please be aware of the following information.

Temperature and Humidity

We use a very popular temperature/humidity sensor. It is pre-calibrated and extremely accurate. Temperature accuracy is ±0.4 °C and humidity is accurate to ±4% below 80%. The sensor is tested in a precisely controlled environment at a fixed temperature and humidity to pass quality control. 

In short we are very comfortable with the quality and accuracy of the WEATHERmeter.

The WEATHERmeter's temperature and humidity sensor can take a little time to adapt to changes. Example: If you have it indoors in 40% humidity and 72° then walk outside to 70% humidity and 90°, it's going to take some time (depending on how windy it is - the more airflow the faster) for the meter to report ambient conditions.

Also note that temperature and humidity readings are best taken in the shade without anything surrounding them. Leaving the WEATHERmeter in direct sun for more than a few minutes can cause it to heat up and report higher temperature and lower humidity readings. Unlike a permanently-mounted weather station, the WEATHERmeter (like other handheld meters) does not have a solar radiation shield. for all factors that can lead to inaccurate Temperate readings

Pressure

Note that by default the WEATHERmeter measures and reports "station pressure" (as opposed to "sea level pressure").

Wind Speed

The anemometer in each WINDmeter and WEATHERmeter is individually tested before leaving the factory. It is extremely rare to find one that does not report wind speed accurately. That said, there are several things that can help you get a more meaningful wind reading.

1. Double-check that you have the units properly set.  For example, if you prefer mph or knots but have the Settings to m/s, winds will appear to report at roughly half of what you expect.

2. Ensure that you've oriented the Weather Meter correctly.  The WEATHERmeter should point into the wind and should be held up as high as possible.  Holding the device behind, in front of, or even next to your body or another large object can create wind shadowing that results in lower wind speeds being recorded.

3. Stand in an open, unobstructed area when taking readings.  Standing next to a building or structure, beneath a tree, etc., could easily result in lower wind readings. 

Note: The actual wind speed is often much less than the perceived wind speed. For instance, wind speed is a measurement of how far a given mass of air travels over a given time period.  So, wind speeds are always averages (even if other anemometer devices claim otherwise).  It may be that the perceived wind speed is more in line with the wind gust, which is the maximum recorded wind speed over a given period.  

Weather stations near you might read differently for several reasons.

First, recall that wind speed and direction can vary greatly only short distances apart.  For instance, the winds on the beach and the winds on the water can vary substantially.  So, is the fixed weather station really representative of the winds that you are measuring with your WEATHERmeter? 

Second, remember that weather stations themselves may have varying degrees of accuracy.  Is the anemometer for that weather station well-calibrated and well-sited?  Is it reporting the same wind speed units as your personal WEATHERmeter?  Oftentimes, fixed anemometers will be sited at an elevation of roughly 10 m (33 feet).  Hence, it is very likely to record higher wind speeds as the accompanying graphic indicates.

Wind speed decreases the closer to ground you are, even when you have a clean fetch upwind of you. This decrease is due to aerodynamic forces between the air and the ground. That means wind speed at 10 meters off the ground (where most anemometers are sited) is significantly higher than the wind speed at 2 meters (where you normally hold the weather meter). Our human brains automatically calibrate to this phenomenon, and any handheld weather meter will seem to read low. But it's completely normal for a handheld weather meter on the beach to read significantly lower than what your experiences over water (or what nearby weather stations may report).

 

 

 

  

Wind Direction

For notes on taking an accurate wind direction reading, please see this page.

In you still feel your WEATHERmeter readings are incorrect, please follow this link for WEATHERmeter Troubleshooting.

If this doesn't help, please Contact Us with specific details regarding what is happening, where you are, what mobile device you're using, and so on.  Then we can further examine your issue.

 

All WINDmeter and WEATHERmeter Help Topics

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