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.

Mon, May 12, 2008 9:13:30 PM
 Temperature   Maximum:   20.1oC   at 21:14:30, 5/11/2008 
 Minimum:   2.4oC   at 08:44:30, 5/12/2008 
 Mean1:   11.3oC 
 Average2:   8.7oC 
 Relative Humidity   Maximum:   86.5%   at 05:50:30, 5/12/2008 
 Minimum:   17.0%   at 21:14:30, 5/11/2008 
 Mean1:   51.7% 
 Average2:   51.1% 
 Dewpoint   Maximum:   2.2oC   at 05:55:30, 5/12/2008 
 Minimum:   -12.1oC   at 18:01:30, 5/12/2008 
 Mean1:   -4.9oC 
 Average2:   -2.4oC 
 Sea Level Pressure   Maximum:   100.6 kPa   at 16:36:30, 5/12/2008 
 Minimum:   99.0 kPa   at 23:45:30, 5/11/2008 
 Mean1:   99.8 kPa 
 Average2:   100.0 kPa 
 Station Pressure   Maximum:   84.5 kPa   at 16:28:30, 5/12/2008 
 Minimum:   83.8 kPa   at 23:55:30, 5/11/2008 
 Mean1:   84.1 kPa 
 Average2:   84.2 kPa 
Wind Speed   Maximum:   26.2 m/s from NNW (327o)   at 01:08:30, 5/12/2008 
 Average2:   3.9 m/s  
 Wind Direction   Average3:   from NW (324o) 
 Solar Irradiance   Maximum:   1051.6 W/m2   at 16:05:30, 5/12/2008 
 Average2:   200.8 W/m2 
 Rainfall this month   19.05 mm 
 Rainfall since midnight   2.54 mm 
 Past 24 hours   2.54 mm 
 Maximum rate   15.249 mm/hour   at 05:07:00, 5/12/2008 
 Wind-Chill Temperature   Maximum:   20.1 oC   at 21:14:30, 5/11/2008 
 Minimum:   -1.6 oC   at 08:20:30, 5/12/2008 
 Mean1:   9.3 oC 
 Average2:   7.1 oC 
 Heat Index   Maximum:   20.2 oC   at 21:14:30, 5/11/2008 
 Minimum:   2.5 oC   at 08:44:30, 5/12/2008 
 Mean1:   11.3 oC 
 Average2:   8.8 oC 

1 The mean (in the weather industry this can be referred to as either the mean daily value or the average daily value) is actually known statistically as the midrange or midextreme value: (max(x)+min(x))/2.
2 The average given here is also known statistically as 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 irradiance, 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.
3 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 1-minute period.

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