Official 1981-2010 Climate Normals City: HARRISBURG State: IL ID: 113879 Latitude: 37.7408 Longitude: -88.5244 Elevation: 365.1 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 41.7 46.9 57.4 68.8 77.1 85.2 88.6 88.3 81.7 70.8 57.7 44.9 Mean: 32.5 36.9 46.2 56.9 66.0 74.5 77.9 76.8 69.0 57.6 46.9 35.7 Low: 23.2 26.9 35.0 45.0 54.9 63.8 67.3 65.2 56.3 44.5 36.1 26.5 CDD: 0 0 3 32 111 292 402 366 169 28 3 0 HDD: 1009 787 586 275 80 7 0 1 49 256 546 908 Number of Days T090: 0.0 0.0 0.0 0.1 0.6 7.1 13.0 12.3 4.3 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.6 0.0 0.0 0.0 0.0 T000: 0.8 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 T032: 24.8 19.6 12.9 2.6 0.0 0.0 0.0 0.0 0.1 3.4 11.1 22.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 67.5 F Mean Temp: 56.5 F Low Temp: 45.5 F Cooling DD: 1406 Heating DD: 4505 Days above 90 (T090): 37.6 Days above 100 (T100): 0.7 Days below 0 (T000): 1.4 Days below 32 (T032): 96.7 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 3.42 3.42 4.67 4.43 5.07 4.46 3.75 3.00 3.05 3.75 4.50 3.94 Snow: 1.3 1.5 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 Number of Days P001: 7.5 6.8 9.5 11.0 9.9 8.3 7.3 6.3 6.3 6.9 8.7 9.0 P010: 5.0 5.6 7.2 7.9 7.1 6.2 5.5 4.6 4.7 5.4 6.6 6.8 P100: 0.8 0.6 0.9 1.3 1.9 1.4 1.3 0.7 1.0 1.0 1.2 1.0 S001: 0.8 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 S010: 0.5 0.3 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 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: 47.46 inches Snowfall: 3.9 inches Days precipitation at or above 0 inches (P000): 97.5 Days precipitation at or above 0.10 inches (P010): 72.6 Days Precipitation at or above 1.00 inches (P100): 13.1 Days Snowfall at or above 0.1 inches (S001): 1.6 Days Snowfall at or above 1.0 inches (S010): 1.1 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