Official 1981-2010 Climate Normals City: CARBONDALE SOUTHERN IL State: IL ID: 093810 Latitude: 37.7797 Longitude: -89.2497 Elevation: 405.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 41.4 46.4 56.8 67.5 76.8 85.5 88.5 87.5 80.2 69.9 56.4 44.2 Mean: 32.9 37.1 46.4 56.3 66.2 74.7 78.2 76.5 68.1 57.5 46.6 35.9 Low: 24.5 27.9 36.0 45.1 55.6 64.0 67.8 65.5 56.1 45.2 36.9 27.6 CDD: 0 0 3 23 110 296 408 357 143 29 2 0 HDD: 993 780 579 284 73 4 0 1 49 260 552 902 Number of Days T090: 0.0 0.0 0.0 0.0 0.8 6.6 12.4 8.9 2.0 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.5 0.0 0.0 0.0 0.0 T000: 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 T032: 24.3 19.0 11.7 2.7 0.1 0.0 0.0 0.0 0.0 2.4 10.5 21.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 66.8 F Mean Temp: 56.5 F Low Temp: 46.1 F Cooling DD: 1370 Heating DD: 4476 Days above 90 (T090): 31.0 Days above 100 (T100): 0.6 Days below 0 (T000): 0.8 Days below 32 (T032): 91.8 ------------------------------------------------------------------------------------------ Precipitation-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.93 2.77 3.94 4.14 5.16 3.99 3.59 2.88 3.42 3.87 4.25 3.63 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 44.57 inches ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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