Official 1981-2010 Climate Normals City: CARBONDALE SEWAGE PLT State: IL ID: 111265 Latitude: 37.7308 Longitude: -89.1658 Elevation: 390.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 41.8 46.9 57.1 68.3 77.0 85.6 89.0 88.7 81.6 70.3 57.7 45.0 Mean: 32.4 36.6 45.8 56.3 65.8 74.6 78.1 76.5 68.5 57.0 46.6 35.4 Low: 23.0 26.2 34.6 44.3 54.6 63.6 67.3 64.3 55.3 43.7 35.6 25.9 CDD: 0 0 4 30 109 294 408 358 158 28 3 0 HDD: 1010 797 597 291 84 7 0 1 55 276 553 916 Number of Days T090: 0.0 0.0 0.0 0.0 0.8 7.5 14.3 13.4 4.0 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.8 0.0 0.0 0.0 0.0 T000: 0.9 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.4 T032: 24.6 20.2 13.8 3.2 0.0 0.0 0.0 0.0 0.1 3.7 12.0 22.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 67.5 F Mean Temp: 56.2 F Low Temp: 44.9 F Cooling DD: 1391 Heating DD: 4587 Days above 90 (T090): 40.3 Days above 100 (T100): 1.1 Days below 0 (T000): 1.7 Days below 32 (T032): 100.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 3.06 3.08 4.15 4.45 5.37 4.51 3.66 3.26 3.14 3.81 4.63 4.05 Snow: 3.0 4.1 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 2.6 Number of Days P001: 9.5 8.6 11.5 11.4 12.5 9.4 8.6 7.9 7.7 8.3 10.2 10.8 P010: 5.7 5.6 7.2 8.0 8.2 6.3 5.2 5.4 4.9 5.3 6.8 6.7 P100: 0.8 0.7 1.0 1.0 1.6 1.4 1.0 0.9 0.6 1.0 1.0 1.0 S001: 1.7 1.7 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 1.6 S010: 1.1 1.5 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.9 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: 47.17 inches Snowfall: 11.0 inches Days precipitation at or above 0 inches (P000): 116.4 Days precipitation at or above 0.10 inches (P010): 75.3 Days Precipitation at or above 1.00 inches (P100): 12.0 Days Snowfall at or above 0.1 inches (S001): 5.5 Days Snowfall at or above 1.0 inches (S010): 3.9 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