Official 1981-2010 Climate Normals City: WHITE HALL 1 State: IL ID: 119241 Latitude: 39.4411 Longitude: -90.3789 Elevation: 579.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.3 40.4 51.6 64.1 73.6 82.3 85.7 84.7 78.4 66.5 52.6 38.9 Mean: 26.7 30.8 41.3 52.9 62.9 72.0 75.5 74.0 66.3 54.6 42.7 30.3 Low: 18.0 21.2 31.0 41.8 52.1 61.7 65.3 63.3 54.2 42.8 32.8 21.7 CDD: 0 0 2 15 69 227 326 284 121 17 1 0 HDD: 1189 958 736 377 136 17 1 5 82 338 670 1076 Number of Days T090: 0.0 0.0 0.0 0.1 0.4 4.0 7.2 6.7 2.0 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 T000: 2.8 1.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.4 T032: 28.0 23.3 17.3 4.0 0.1 0.0 0.0 0.0 0.0 4.1 14.7 25.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 62.9 F Mean Temp: 52.6 F Low Temp: 42.3 F Cooling DD: 1062 Heating DD: 5584 Days above 90 (T090): 20.4 Days above 100 (T100): 0.3 Days below 0 (T000): 5.7 Days below 32 (T032): 117.2 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.70 1.92 2.91 3.80 4.48 3.98 3.88 3.18 3.18 3.04 3.54 2.61 Snow: 5.5 4.5 1.8 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 3.9 Number of Days P001: 7.0 6.6 10.2 11.6 11.8 9.8 8.8 8.4 7.7 9.1 9.4 8.4 P010: 3.6 4.0 6.4 7.1 7.6 6.6 6.0 5.9 5.1 6.0 6.4 4.9 P100: 0.4 0.4 0.5 0.9 1.1 1.1 1.2 0.8 1.0 0.6 0.9 0.6 S001: 2.4 2.0 1.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.3 S010: 1.7 1.3 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.9 S100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 38.22 inches Snowfall: 16.5 inches Days precipitation at or above 0 inches (P000): 108.8 Days precipitation at or above 0.10 inches (P010): 69.6 Days Precipitation at or above 1.00 inches (P100): 9.5 Days Snowfall at or above 0.1 inches (S001): 8.1 Days Snowfall at or above 1.0 inches (S010): 5.8 Days Snowfall at or above 10.0 inches (S100): 0.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ KEY: High - average daily high temperature, degrees F Mean - average daily mean temperature, degrees F Low - average daily low temperature, degrees F CDD - cooling degree days, base 50F HDD - heating degree days, base 50F T090 - number of Days with Temperatures above 90 degrees F T100 - number of Days with Temperatures above 100 degrees F T000 - number of Days with Temperatures below 0 degrees F T032 - number of Days with Temperatures below 32 degrees F Prcp - precipitation, inches Snow - snowfall, inches P001 - number of Days with Precipitation of 0.01 inches or more P010 - number of Days with Precipitation of 0.10 inches or more P100 - number of Days with Precipitation of 1.00 inches or more S001 - number of Days with Snowfall of 0.1 inches or more S010 - number of Days with Snowfall of 1.0 inches or more S100 - number of Days with Snowfall of 10.0 inches or more Page Source: Dr. Jim Angel, State Climatologist Illinois State Water Survey Prairie Research Institute University of Illinois Data Source: NOAA National Climatic Data Center