Official 1981-2010 Climate Normals City: ATHENS 2SW State: IL ID: 110306 Latitude: 39.9467 Longitude: -89.7597 Elevation: 589.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 34.4 39.5 51.4 64.2 73.6 81.6 83.4 83.5 77.2 65.1 52.7 38.1 Mean: 26.1 30.3 40.8 52.7 62.4 71.2 73.8 73.0 65.2 53.8 43.1 29.7 Low: 17.7 21.1 30.3 41.2 51.3 60.9 64.3 62.4 53.2 42.5 33.5 21.2 CDD: 0 0 1 12 68 206 276 253 94 14 1 0 HDD: 1207 971 750 382 147 18 2 7 88 361 658 1095 Number of Days T090: 0.0 0.0 0.0 0.1 0.5 2.3 3.7 4.5 1.2 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 T000: 2.3 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.3 T032: 28.0 24.2 18.9 4.7 0.5 0.0 0.0 0.0 0.0 4.3 13.5 26.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 62.2 F Mean Temp: 51.9 F Low Temp: 41.7 F Cooling DD: 925 Heating DD: 5687 Days above 90 (T090): 12.3 Days above 100 (T100): 0.1 Days below 0 (T000): 4.5 Days below 32 (T032): 120.2 ------------------------------------------------------------------------------------------ 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: 1.92 1.95 2.61 3.76 4.39 4.22 4.17 3.48 3.09 3.06 3.37 2.62 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 38.64 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