Weather Summary for January 2009

Brigham Young University, Department of Physics and Astronomy

Eyring Science Center, Provo, Utah

Mean Values
ValueMonthly MeanMonthly AverageAverage MinimumAverage Maximum
Temperature 29.1 F ( -1.59 C) 27.3 F ( -2.63 C) 18.4 F ( -7.56 C) 39.9 F ( 4.37 C)
Humidity 68.2% 74.0% 45.0% 91.3%
Dew Point 19.4 F ( -6.99 C) 19.4 F ( -6.98 C) 13.8 F (-10.10 C) 25.0 F ( -3.88 C)
Pressure 30.13 in. Hg (102.0 kPa) 30.14 in. Hg (102.1 kPa) 29.99 in. Hg (101.6 kPa) 30.28 in. Hg (102.5 kPa)
Absolute Pressure 25.14 in. Hg ( 85.1 kPa) 25.13 in. Hg ( 85.1 kPa) 25.03 in. Hg ( 84.8 kPa) 25.25 in. Hg ( 85.5 kPa)
Wind Speed 0.5 mph ( 0.22 m/s) 8.0 mph ( 3.58 m/s)
Solar Irradiance 0.20 cal/min/cm2 ( 139. W/m2) 0.73 cal/min/cm2 ( 509. W/m2)
Wind Chill 28.2 F ( -2.13 C) 28.2 F ( 28.17 C) 16.9 F ( -8.41 C) 39.5 F ( 4.16 C)
Heat Index 29.1 F ( -1.59 C) 27.3 F ( 27.26 C) 18.4 F ( -7.56 C) 39.9 F ( 4.37 C)

Monthly rainfall: 3.22 in. ( 81.8 mm)
Maximum daily rainfall: 1.11 in. ( 28.2 mm) on 25
Maximum rainfall rate: 0.800 in./hour ( 20.32 mm/hour) on 24 at 14:45:23
Heating degree-days (base 65): 1111.9 (Maximum: 53.2 on 4)
Cooling degree-days (base 65): 0.0 (Maximum: 0.0 on 31)
Growing degree-days (base 40): 6.1 (Maximum: 4.4 on 23)
Growing degree-days (base 50): 0.0 (Maximum: 0.0 on 31)

Extreme Values
ValueLowestonatHighestonat
Maximum Temperature 22.1 F ( -5.53 C) 4 13:16:23 53.7 F ( 12.07 C) 2 15:16:23
Minimum Temperature 1.6 F (-16.86 C) 4 07:59:23 35.7 F ( 2.06 C) 23 22:42:23
Maximum Humidity 80.1% 28 22:23:23 97.9% 26 00:09:23
Minimum Humidity 26.8% 2 15:16:23 80.7% 25 15:49:23
Maximum Dew Point 4.8 F (-15.10 C) 4 00:10:23 39.7 F ( 4.27 C) 24 10:06:23
Minimum Dew Point -5.8 F (-21.00 C) 4 10:16:23 33.8 F ( 1.01 C) 23 22:42:23
Maximum Pressure 29.67 in. Hg (100.5 kPa) 25 00:00:23 30.66 in. Hg (103.8 kPa) 18 11:15:23
Minimum Pressure 29.34 in. Hg ( 99.3 kPa) 2 17:57:23 30.42 in. Hg (103.0 kPa) 18 01:54:23
Maximum Absolute Pressure 24.85 in. Hg ( 84.1 kPa) 25 00:00:23 25.56 in. Hg ( 86.5 kPa) 10 11:15:23
Minimum Absolute Pressure 24.60 in. Hg ( 83.3 kPa) 25 19:40:23 25.35 in. Hg ( 85.8 kPa) 18 04:26:23
Maximum Wind Speed 1.1 mph ( 0.51 m/s) at 270. deg. 31 23:37:23 26.3 mph (11.75 m/s) at 251. deg. 24 14:43:23
Maximum Solar Irradiance 0.16 cal/min/cm2 ( 108. W/m2) 6 13:13:23 1.21 cal/min/cm2 ( 845. W/m2) 29 12:18:23
Maximum Wind Chill 21.6 F ( -5.79 C) 4 13:38:23 53.5 F ( 11.97 C) 2 15:16:23
Minimum Wind Chill 1.3 F (-17.08 C) 5 11:43:23 33.3 F ( 0.71 C) 23 08:07:23
Maximum Heat Index 22.1 F ( -5.53 C) 4 13:16:23 53.7 F ( 12.07 C) 2 15:16:23
Minimum Heat Index 1.6 F (-16.86 C) 4 07:59:23 35.7 F ( 2.06 C) 23 22:42:23