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.

Sun, Nov 22, 2009 9:13:30 PM
 Temperature   Maximum:   9.3oC   at 12:35:30, 11/22/2009 
 Minimum:   -4.2oC   at 06:17:30, 11/22/2009 
 Mean1:   2.5oC 
 Average2:   1.1oC 
 Relative Humidity   Maximum:   90.7%   at 19:20:30, 11/22/2009 
 Minimum:   24.0%   at 16:10:30, 11/22/2009 
 Mean1:   57.4% 
 Average2:   54.9% 
 Dewpoint   Maximum:   -1.8oC   at 19:20:30, 11/22/2009 
 Minimum:   -11.5oC   at 13:30:30, 11/22/2009 
 Mean1:   -6.7oC 
 Average2:   -8.0oC 
 Sea Level Pressure   Maximum:   101.2 kPa   at 09:43:30, 11/22/2009 
 Minimum:   100.4 kPa   at 17:24:30, 11/22/2009 
 Mean1:   100.8 kPa 
 Average2:   101.0 kPa 
 Station Pressure   Maximum:   84.6 kPa   at 10:31:30, 11/22/2009 
 Minimum:   84.0 kPa   at 17:10:30, 11/22/2009 
 Mean1:   84.3 kPa 
 Average2:   84.4 kPa 
Wind Speed   Maximum:   19.4 m/s from NNW (329o)   at 18:17:30, 11/22/2009 
 Average2:   1.5 m/s  
 Wind Direction   Average3:   from NNW (334o) 
 Solar Irradiance   Maximum:   743.7 W/m2   at 12:12:30, 11/22/2009 
 Average2:   119.1 W/m2 
 Rainfall this month   7.11 mm 
 Rainfall since midnight   0.00 mm 
 Past 24 hours   0.00 mm 
 Maximum rate   0.000 mm/hour   at 21:14:00, 11/21/2009 
 Wind-Chill Temperature   Maximum:   9.0 oC   at 12:00:30, 11/22/2009 
 Minimum:   -10.7 oC   at 20:58:30, 11/22/2009 
 Mean1:   -0.8 oC 
 Average2:   0.0 oC 
 Heat Index   Maximum:   10.1 oC   at 12:35:30, 11/22/2009 
 Minimum:   -4.1 oC   at 06:15:30, 11/22/2009 
 Mean1:   3.0 oC 
 Average2:   1.3 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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