WEATHERmeter Technical Specifications

Weatherflow WEATHERmeter

The Weatherflow WEATHERmeter is a highly accurate miniature weather device used with your smartphone to measure wind, temperature, humidity and pressure readings. You can record data in a variety of compatible apps including the free WINDmeter app and share reports instantly via email, SMS, Twitter, Instagram, and more.   

WEATHERmeter uses Bluetooth Smart (super energy efficient) to wirelessly communicate to your smartphone up to 100 feet away. From sailors to farmers, now anyone can capture and share accurate weather data with the WEATHERmeter.


  • wind speed (avg, gust, apparent, true)
  • wind direction (magnetic, true)
  • crosswind, headwind, tailwind
  • temperature & relative humidity
  • pressure & dew point
  • heat index, wind chill, and more
  • Bluetooth® Smart (super energy efficient; range up to 100 ft away)
  • held in hand or attached to any 1/4"-20 thread mount


List of available values

  1. Wind Speed
  2. Wind Direction
  3. Wind Speed (Avg)
  4. Wind Speed (Gust)
  5. Temperature (Dry Bulb Temperature)
  6. Pressure
  7. Humidity
  8. Apparent Speed
  9. Apparent Angle
  10. Dew Point
  11. Wet Bulb Temperature
  12. Wind Chill
  13. Heat Index
  14. Feels Like
  15. Air Density
  16. Delta-T
  17. Headwind/Tailwind
  18. Crosswind








wind speed

0.5 to 125 mph

0.4 to 110 Knots

0.8 to 200 kph

0.2 to 55 m/s

Full Beaufort scale

± 0.5%

calibrated by University of Florida Aerospace Engineering

wind direction

0 to 360°

± 0.5°



0 to 95%

± 3% up to 85%

 above 85% slight decrease in accuracy

atmospheric pressure

8.9 to 32.5 inHg

300 to 1100 mbar

± 0.03 inHg

± 1 mbar



-40 to 255°F  

-40 to 125°C

± 0.7°F

± 0.4°C


Bluetooth range

100 ft


Range will vary depending on line of sight, obstructions, and device. 




CR 2450


Here a brief explanation of the available values:

  • Wind Speed - Wind speed, or wind flow velocity, is a fundamental atmospheric rate. Wind speed is caused by air moving from high pressure to low pressure, usually due to changes in temperature.
  • Wind Direction - Wind direction is reported by the direction from which it originates. For example, a northerly wind blows from the north to the south. Wind direction is usually reported in cardinal directions or in azimuth degrees. For example, a wind coming from the south is given as 180 degrees; one from the east is 90 degrees.
  • Wind Speed(Avg) - The average over the sample period
  • Wind Speed (Gust) -The Maximum gust over the sample period
  • Temperature (Dry Bulb Temperature) - The dry-bulb temperature (DBT) is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture.
  • Pressure - WEATHERmeter measures and reports "station pressure" (as opposed to "sea level pressure").
  • Humidity- Humidity is the amount of water vapor in the air. Water vapor is the gaseous state of water and is invisible
  • Apparent Speed -The Apparent wind is the wind experienced by an observer in motion and is the relative velocity of the wind in relation to the observer. Apparent wind velocity is the vector sum of the true wind and the headwind an object would experience in still air.
  • Apparent Angle - Apparent wind velocity is the vector sum of the true wind and the headwind an object would experience in still air.
  • Dew Point - the temperature to which air must be cooled, at a given pressure and water-vapor content, for it to reach saturation; the temperature at which dew begins to form
  • Wet Bulb Temperature - The wet-bulb temperature is the temperature a parcel of air would have if it were cooled to saturation (100% relative humidity) by the evaporation of water into it, with the latent heat being supplied by the parcel.
  • Wind Chill- Wind-chill or windchill, (popularly wind chill factor) is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air.
  • Heat Index - a quantity expressing the discomfort felt as a result of the combined effects of the temperature and humidity of the air.
  • Feels Like - The combination of the heat index and the wind chill factor are denoted collectively by the single terms "apparent temperature" or "relative outdoor temperature" or simply "Feels Like". Wind chill is the apparent temperature felt on exposed skin, which is a function of the air temperature and wind speed.
  • Air Density - The mass per unit of volume of air in terms of weight per unit of volume.
  • Delta T - Delta T is used by the agricultural industry. It is an important indicator for acceptable spraying conditions. It is indicative of evaporation rate and droplet lifetime. Delta T is calculated by subtracting the wet bulb temperature from the dry bulb temperature. When applying pesticides, Delta T should ideally be between 2 and 8, and not greater than 10.
  • Headwind/Tailwind - A tailwind is a wind that blows in the direction of travel of an object, while a headwind blows against the direction of travel. A tailwind increases the object's speed and reduces the time required to reach its destination, while a headwind has the opposite effect.
  • Crosswind - a wind blowing across one's direction of travel.




All WINDmeter and WEATHERmeter Help Topics

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