Official 1981-2010 Climate Normals City: MATTOON State: IL ID: 115430 Latitude: 39.4725 Longitude: -88.3544 Elevation: 720.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.0 39.8 51.5 64.4 74.6 83.6 86.5 85.0 79.3 66.2 52.1 38.2 Mean: 27.7 31.9 42.3 54.1 64.2 73.5 76.6 74.8 68.0 56.1 43.6 31.0 Low: 20.5 24.1 33.1 43.8 53.8 63.4 66.7 64.6 56.6 46.0 35.1 23.8 CDD: 0 0 2 17 89 267 360 307 148 22 1 0 HDD: 1155 925 706 344 114 12 0 3 59 298 643 1054 Number of Days T090: 0.0 0.0 0.0 0.0 0.7 5.3 8.1 6.5 2.8 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.0 0.0 0.0 0.0 T000: 2.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 T032: 25.7 21.2 14.4 2.8 0.1 0.0 0.0 0.0 0.0 1.9 12.3 23.0 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.1 F Mean Temp: 53.8 F Low Temp: 44.4 F Cooling DD: 1212 Heating DD: 5313 Days above 90 (T090): 23.4 Days above 100 (T100): 0.4 Days below 0 (T000): 4.2 Days below 32 (T032): 101.5 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.26 2.14 2.71 4.01 4.17 4.11 4.22 2.89 3.22 3.56 3.85 2.96 Snow: 5.8 3.0 1.4 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.4 3.7 Number of Days P001: 9.0 8.0 9.9 11.2 11.7 10.5 8.9 7.9 7.2 8.5 10.4 9.6 P010: 4.9 4.6 6.3 7.3 7.8 7.1 6.3 5.2 4.8 5.8 6.4 5.1 P100: 0.4 0.4 0.4 0.9 1.0 1.2 1.1 0.9 1.1 1.0 1.2 0.7 S001: 3.1 2.3 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.9 S010: 2.1 1.2 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.7 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: 40.10 inches Snowfall: 14.4 inches Days precipitation at or above 0 inches (P000): 112.8 Days precipitation at or above 0.10 inches (P010): 71.6 Days Precipitation at or above 1.00 inches (P100): 10.3 Days Snowfall at or above 0.1 inches (S001): 9.5 Days Snowfall at or above 1.0 inches (S010): 5.7 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