Official 1981-2010 Climate Normals City: KASKASKIA RVR NAV State: IL ID: 114629 Latitude: 37.9842 Longitude: -89.9492 Elevation: 379.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 40.9 46.0 56.7 68.3 77.6 86.4 90.2 89.2 81.4 69.7 56.6 43.3 Mean: 31.9 35.9 45.7 56.4 66.2 75.2 79.2 77.5 69.3 57.8 46.6 34.7 Low: 22.9 25.9 34.8 44.6 54.9 64.1 68.1 65.7 57.1 45.9 36.5 26.1 CDD: 0 0 3 29 119 313 439 388 176 32 2 0 HDD: 1026 813 600 285 80 6 0 2 49 255 556 939 Number of Days T090: 0.0 0.0 0.0 0.3 1.7 9.5 17.1 14.0 4.5 0.3 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.4 1.7 1.0 0.2 0.0 0.0 0.0 T000: 0.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 T032: 25.4 20.6 12.5 2.3 0.0 0.0 0.0 0.0 0.0 2.0 10.5 21.8 ------------------------------------------------------------------------------------------ Annual Values High Temp: 67.3 F Mean Temp: 56.5 F Low Temp: 45.6 F Cooling DD: 1502 Heating DD: 4612 Days above 90 (T090): 47.4 Days above 100 (T100): 3.3 Days below 0 (T000): 2.0 Days below 32 (T032): 95.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.44 2.21 3.35 3.77 5.20 3.89 3.81 3.40 3.46 3.49 4.24 3.68 Snow: 1.0 1.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.6 Number of Days P001: 5.8 6.1 9.2 9.5 10.9 8.2 7.5 6.4 6.6 8.1 8.0 8.2 P010: 4.1 4.7 6.8 6.8 8.3 6.1 5.5 5.2 4.8 6.2 6.2 5.8 P100: 0.7 0.4 0.7 0.9 1.4 1.1 1.3 1.1 1.1 0.8 1.1 1.0 S001: 0.8 1.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 S010: 0.5 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 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: 42.94 inches Snowfall: 4.5 inches Days precipitation at or above 0 inches (P000): 94.5 Days precipitation at or above 0.10 inches (P010): 70.5 Days Precipitation at or above 1.00 inches (P100): 11.6 Days Snowfall at or above 0.1 inches (S001): 2.8 Days Snowfall at or above 1.0 inches (S010): 2.0 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