Official 1981-2010 Climate Normals City: KNOXVILLE State: IL ID: 114780 Latitude: 40.9033 Longitude: -90.2892 Elevation: 749.8 ft Temperature-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 High: 31.1 36.5 48.7 61.6 71.8 81.0 83.7 82.7 76.4 63.8 49.4 35.3 Mean: 22.6 27.5 38.4 50.4 60.9 70.8 73.9 72.8 64.9 52.6 40.0 26.7 Low: 14.0 18.5 28.0 39.1 50.0 60.6 64.0 62.8 53.4 41.3 30.6 18.1 CDD: 0 0 0 5 41 190 276 244 86 14 0 0 HDD: 1316 1050 826 444 168 17 2 4 90 400 750 1187 Number of Days T090: 0.0 0.0 0.0 0.0 0.8 1.4 3.0 2.0 0.6 0.4 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T000: 5.8 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.8 T032: 28.6 25.1 21.8 5.8 0.0 0.0 0.0 0.0 0.0 3.8 17.9 28.7 ------------------------------------------------------------------------------------------ Annual Values High Temp: 60.3 F Mean Temp: 50.2 F Low Temp: 40.1 F Cooling DD: 857 Heating DD: 6254 Days above 90 (T090): 8.2 Days above 100 (T100): 0.0 Days below 0 (T000): 8.9 Days below 32 (T032): 131.7 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.88 1.97 2.79 3.95 4.86 4.51 4.29 4.19 3.80 3.17 2.76 2.45 Snow: 6.7 5.7 3.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.6 8.5 Number of Days P001: 8.2 8.2 10.2 11.4 12.9 11.9 10.0 10.9 7.8 9.6 8.3 10.2 P010: 3.9 4.4 6.7 7.4 8.1 7.5 6.2 6.6 5.0 5.5 4.1 5.8 P100: 0.5 0.5 0.6 1.2 1.6 1.9 1.2 1.1 1.1 0.6 0.2 0.4 S001: 4.0 3.9 1.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 4.8 S010: 2.0 2.1 1.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.1 S100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 40.62 inches Snowfall: 25.2 inches Days precipitation at or above 0 inches (P000): 119.6 Days precipitation at or above 0.10 inches (P010): 71.2 Days Precipitation at or above 1.00 inches (P100): 10.9 Days Snowfall at or above 0.1 inches (S001): 14.6 Days Snowfall at or above 1.0 inches (S010): 8.7 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