Official 1981-2010 Climate Normals City: SHELBYVILLE DAM State: IL ID: 117876 Latitude: 39.4067 Longitude: -88.7747 Elevation: 654.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 34.8 41.4 51.9 64.0 73.9 83.2 86.6 85.7 80.0 66.9 53.3 39.5 Mean: 26.5 31.6 41.8 53.5 63.6 73.3 76.6 75.1 68.1 55.4 43.4 30.9 Low: 18.1 21.9 31.7 43.0 53.4 63.5 66.6 64.5 56.3 44.0 33.4 22.3 CDD: 0 0 1 13 77 262 360 315 150 22 0 0 HDD: 1195 934 720 358 119 12 0 3 56 318 650 1057 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 4.5 8.2 7.3 2.8 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.1 0.0 0.0 0.0 0.0 T000: 2.6 1.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 T032: 26.7 22.8 16.8 3.1 0.0 0.0 0.0 0.0 0.0 3.1 14.2 25.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.5 F Mean Temp: 53.4 F Low Temp: 43.3 F Cooling DD: 1200 Heating DD: 5420 Days above 90 (T090): 23.5 Days above 100 (T100): 0.4 Days below 0 (T000): 5.2 Days below 32 (T032): 112.2 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.11 2.06 2.73 3.83 4.05 3.85 3.54 3.20 3.07 3.84 4.06 2.95 Number of Days P001: 6.7 7.2 9.6 10.3 11.5 9.6 8.4 7.5 7.4 8.7 8.7 8.7 P010: 4.3 5.0 6.0 7.5 7.8 6.4 5.8 5.4 4.8 6.0 6.2 5.2 P100: 0.6 0.7 0.6 0.8 1.1 1.3 0.9 0.7 0.9 1.1 1.1 1.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 39.29 inches Days precipitation at or above 0 inches (P000): 104.3 Days precipitation at or above 0.10 inches (P010): 70.4 Days Precipitation at or above 1.00 inches (P100): 10.8 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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