Official 1981-2010 Climate Normals City: EFFINGHAM 3SW State: IL ID: 093816 Latitude: 39.1186 Longitude: -88.6242 Elevation: 624.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 36.2 41.2 52.3 64.5 74.2 83.7 87.1 86.2 79.5 67.1 53.6 39.9 Mean: 28.0 32.1 42.2 53.4 63.4 72.9 76.4 74.9 67.2 55.3 43.9 31.6 Low: 19.7 23.0 32.1 42.2 52.6 62.2 65.7 63.5 54.9 43.6 34.2 23.3 CDD: 0 0 2 16 79 253 354 309 137 21 1 0 HDD: 1148 921 709 366 128 15 1 4 71 320 634 1035 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 5.4 9.3 9.1 3.2 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.5 0.0 0.0 0.0 0.0 T000: 2.1 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.3 T032: 25.9 22.1 16.9 3.9 0.2 0.0 0.0 0.0 0.0 3.4 13.3 24.3 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.9 F Mean Temp: 53.5 F Low Temp: 43.2 F Cooling DD: 1173 Heating DD: 5352 Days above 90 (T090): 27.7 Days above 100 (T100): 0.9 Days below 0 (T000): 4.3 Days below 32 (T032): 110.0 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.89 2.72 3.27 4.01 5.27 4.46 4.43 2.75 2.99 3.59 4.13 3.22 Snow: 4.5 5.3 1.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.4 3.2 Number of Days P001: 8.8 8.5 10.4 11.4 11.6 10.3 9.4 7.6 7.1 8.9 10.0 10.1 P010: 5.0 5.3 6.5 7.5 8.7 7.1 6.7 5.1 4.7 5.6 7.1 6.0 P100: 0.5 0.7 0.6 0.9 1.4 1.1 1.3 0.6 0.8 1.1 1.2 1.0 S001: 3.7 3.1 1.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.5 S010: 2.1 1.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.6 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: 43.73 inches Snowfall: 15.2 inches Days precipitation at or above 0 inches (P000): 114.1 Days precipitation at or above 0.10 inches (P010): 75.3 Days Precipitation at or above 1.00 inches (P100): 11.2 Days Snowfall at or above 0.1 inches (S001): 10.7 Days Snowfall at or above 1.0 inches (S010): 6.3 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