Official 1981-2010 Climate Normals City: HILLSBORO State: IL ID: 114108 Latitude: 39.1500 Longitude: -89.4833 Elevation: 629.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 38.0 43.8 55.1 67.6 77.2 85.7 89.3 88.0 81.2 69.4 54.8 41.3 Mean: 29.8 34.5 44.9 56.5 66.1 75.1 78.7 77.0 69.0 57.8 45.5 33.3 Low: 21.5 25.2 34.7 45.4 55.0 64.4 68.1 66.0 56.8 46.1 36.2 25.3 CDD: 0 0 4 30 116 308 425 373 168 33 2 0 HDD: 1092 854 627 285 82 7 0 1 48 258 587 982 Number of Days T090: 0.0 0.0 0.0 0.0 1.1 8.4 13.6 11.3 3.7 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.6 0.5 0.0 0.0 0.0 0.0 T000: 1.6 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 T032: 25.3 20.0 13.1 2.5 0.0 0.0 0.0 0.0 0.0 2.0 11.1 22.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 66.1 F Mean Temp: 55.8 F Low Temp: 45.5 F Cooling DD: 1459 Heating DD: 4824 Days above 90 (T090): 38.3 Days above 100 (T100): 1.3 Days below 0 (T000): 3.3 Days below 32 (T032): 96.5 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.51 2.32 2.96 4.17 5.21 3.63 3.94 3.02 3.37 3.36 4.03 2.87 Snow: 6.2 3.1 1.4 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.3 3.4 Number of Days P001: 5.8 6.0 8.4 9.4 10.3 8.4 7.4 7.0 6.2 7.4 7.3 7.7 P010: 3.9 4.7 6.6 7.1 7.9 7.2 6.2 5.5 4.9 5.9 6.4 5.4 P100: 0.7 0.5 0.7 1.0 1.7 0.8 1.0 0.9 1.0 1.1 1.2 0.9 S001: 2.1 1.5 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.6 S010: 1.4 1.0 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.2 S100: 0.1 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: 41.39 inches Snowfall: 14.6 inches Days precipitation at or above 0 inches (P000): 91.3 Days precipitation at or above 0.10 inches (P010): 71.7 Days Precipitation at or above 1.00 inches (P100): 11.5 Days Snowfall at or above 0.1 inches (S001): 6.2 Days Snowfall at or above 1.0 inches (S010): 4.4 Days Snowfall at or above 10.0 inches (S100): 0.1 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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