Summary of the past 24 hours from the unofficial station on the roof of the Eyring Science Center on the campus of Brigham Young University in Provo, Utah, USA.

Wed, Feb 20, 2019 9:32:17 PM Wed, Feb 20, 2019 9:31:00 PM¹
Current Values Past 24 hours
 Temperature   -3.6 °C   rising 0.32 °C/hour   Maximum:   1.1 °C   at 14:38:50, 2/20/2019 
 Minimum:   -8.2 °C   at 06:08:50, 2/20/2019 
 Mean²:   -3.5 °C 
 Average³:   -4.7 °C 
 Relative Humidity   57 %   falling 2.9 %/hour   Maximum:   73.9%   at 06:00:50, 2/20/2019 
 Minimum:   34.6%   at 14:40:50, 2/20/2019 
 Mean²:   54.3% 
 Average³:   49.5% 
 Dewpoint   -10.9 °C   falling 0.33 °C/hour   Maximum:   -8.8 °C   at 18:42:00, 2/20/2019 
 Minimum:   -17.3 °C   at 00:32:50, 2/20/2019 
 Mean²:   -13.1 °C 
 Average³:   -13.9 °C 
 Mean Sea Level Pressure   99.9 kPa   falling 0.04 kPa/hour   Maximum:   101.0 kPa   at 21:33:50, 2/19/2019 
 Minimum:   99.9 kPa   at 21:25:00, 2/20/2019 
 Mean²:   100.5 kPa 
 Average³:   100.5 kPa 
Station Pressure   83.7 kPa   Maximum:   84.5 kPa   at 21:33:50, 2/19/2019 
 Minimum:   83.7 kPa   at 21:19:00, 2/20/2019 
 Mean²:   84.1 kPa 
 Average³:   84.1 kPa 
 Wind Speed   0.8 m/s from NNW (333)   Maximum:   5.8 m/s from SE (145°)   at 07:08:50, 2/20/2019 
 Average³:   1.8 m/s 
 Wind Direction   Average4  from S (171°) 
 Solar Irradiance   27 W/m²   rising 1.3 (W/m²)/hour   Maximum:   654 W/m²   at 12:41:50, 2/20/2019 
 Average³:   144 W/m² 
 Rainfall this month   30.0 mm 
 Rainfall since midnight   0.0 mm   Past 24 hours   0.0 mm 
 Maximum rate   0.00 mm/hour   at 21:36:50, 2/19/2019 
 Wind-Chill Temperature   -3.6 °C   Maximum:   0.6 °C   at 14:55:50, 2/20/2019 
 Minimum:   -14.6 °C   at 07:07:50, 2/20/2019 
 Mean²:   -7.0 °C 
 Average³:   -7.1 °C 
 Heat Index   -3.6 °C   Maximum:   1.4 °C   at 14:38:50, 2/20/2019 
 Minimum:   -8.1 °C   at 06:08:50, 2/20/2019 
 Mean²:   -3.3 °C 
 Average³:   -4.5 °C 

Click here for metric units.

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¹ The time for the Past 24-hours values is the time those values were last updated. It is usually before the current time because the history values are only updated every few minutes.
² The mean is the midrange or midextreme value: (max(x)+min(x))/2. In the weather industry this can be referred to as either the mean daily value or the average daily value.
³ The average given here is the arithmetic mean: Σxi/N where the sum is performed over the available data for the previous 24-hour period. Normally the available data is the 1-minute average (arithmetic mean of data taken once per second) for temperature, humidity, mean sea-level pressure, station pressure, solar insolation, and dewpoint. For wind chill the 1-minute value is the minimum recorded over that period. For wind speed and heat index it is the maximum during the period.
4 The average wind direction is the vector average which incorporates both the direction and speed. It is the net direction a parcel of air would have moved if you could track it over the 24-hour period.