Where t is the outdoor temperature (centigrade) and v is the average wind speed in m/s (not km/h). Since writing the above Phil Maddocks has sent me a much better formula, based on Court's formula for Heat Loss: Unfortunately this formula is just not working for me at present, with results quite different from the EasyWeather values. Where t is the outdoor temperature (centigrade) and v is the average wind speed in km/h. There are various quite different formulae, with some variation by country. I've yet to discover what happens at sub zero temperatures. This formula is only accurate to about 0.4 degrees anyway, so this result is acceptable. This formula gives results within 0.1 degrees of the EasyWeather values, especially after some rounding tweaks are added.
Where t is the outdoor temperature in degrees centigrade and rh is the relative humidity. I have found formulae on various web sites, but none exactly matches the values in the data file. The dew point and wind chill values are computed from outdoor temperature, outdoor humidity and average wind speed. The raw data as it came from the weather station
After reaching 00FFF0, returns to 000100 - i.e. Pointer to where in weather station's memory data came from. Column 19 * 0.3, but does not reset to zero, stays fixed until ticks catch up Resets to zero if station's batteries removed 0 is north, 1 is NNE, 8 is south, 15 is NNWĬumulative count of number of times rain gauge has tipped. Appears to be derived from computer's clock at time of transferĠ to 15. Columnĭate and time (according to computer, not weather station) of transfer from station to fileĭate and time of record. For more details about this software, and links to other weather station software, see my main weather station page. The table below shows what I think each column means.Īfter a few months I stopped using EasyWeather, as I'd developed my own alternative software to run on a low power embedded Linux box. It's a plain text file, with comma separated values (i.e.
Home page > weather station > EasyWeather.datĪs part of my experimenting with the EasyWeather software that came with my weather station I've managed to decipher the meaning of most of the numbers in the EasyWeather.dat file.
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