Official 1981-2010 Climate Normals City: SALEM State: IL ID: 117636 Latitude: 38.6453 Longitude: -88.9461 Elevation: 549.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 38.0 43.0 54.0 65.9 75.3 84.3 87.8 86.9 79.7 68.3 54.6 41.2 Mean: 29.3 33.3 43.5 54.9 64.6 73.7 77.4 76.0 68.0 56.5 44.6 32.7 Low: 20.5 23.6 33.0 43.9 53.8 63.2 67.1 65.2 56.3 44.6 34.6 24.2 CDD: 0 0 2 20 91 272 386 344 147 23 1 0 HDD: 1108 887 669 323 104 9 0 2 57 288 613 1001 Number of Days T090: 0.0 0.0 0.0 0.0 0.6 6.1 10.6 9.0 2.5 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.3 0.0 0.0 0.0 0.0 T000: 1.6 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 T032: 26.5 22.2 15.4 3.2 0.0 0.0 0.0 0.0 0.0 2.7 12.5 24.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 65.0 F Mean Temp: 54.6 F Low Temp: 44.3 F Cooling DD: 1286 Heating DD: 5063 Days above 90 (T090): 29.0 Days above 100 (T100): 0.5 Days below 0 (T000): 3.2 Days below 32 (T032): 106.8 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.83 2.64 3.69 3.77 5.02 4.18 4.02 3.39 3.17 3.74 4.20 3.23 Snow: 4.1 3.6 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.3 2.7 Number of Days P001: 8.8 7.9 9.7 10.2 11.6 9.8 8.4 8.1 7.0 8.9 9.7 9.5 P010: 4.9 5.2 6.4 7.0 8.0 7.0 6.0 5.7 5.1 5.8 7.0 6.0 P100: 0.7 0.5 1.0 0.9 1.3 1.2 1.2 0.9 0.9 1.0 1.1 0.6 S001: 2.8 2.2 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 2.0 S010: 1.5 1.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.2 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: 43.88 inches Snowfall: 11.5 inches Days precipitation at or above 0 inches (P000): 109.6 Days precipitation at or above 0.10 inches (P010): 74.1 Days Precipitation at or above 1.00 inches (P100): 11.3 Days Snowfall at or above 0.1 inches (S001): 7.7 Days Snowfall at or above 1.0 inches (S010): 4.3 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