Official 1981-2010 Climate Normals City: PROPHETSTOWN State: IL ID: 117014 Latitude: 41.6808 Longitude: -89.9403 Elevation: 604.8 ft Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.44 1.51 2.91 3.41 4.02 4.43 4.03 5.01 3.17 3.05 2.79 2.28 Snow: 10.1 6.6 2.8 0.8 0.0 0.0 0.0 0.0 0.0 0.1 1.2 9.7 Number of Days P001: 7.3 6.2 8.1 9.9 10.2 9.9 7.6 8.3 5.9 7.4 6.0 6.7 P010: 4.2 4.4 5.3 7.3 7.8 7.7 6.2 7.3 4.7 5.8 4.3 5.1 P100: 0.2 0.3 0.5 1.0 1.3 1.3 0.9 1.6 0.8 0.8 0.4 0.4 S001: 4.5 3.5 1.6 0.5 0.0 0.0 0.0 0.0 0.0 0.1 0.9 4.2 S010: 3.1 2.3 0.8 0.4 0.0 0.0 0.0 0.0 0.0 0.1 0.6 3.3 S100: 0.1 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: 38.05 inches Snowfall: 31.3 inches Days precipitation at or above 0 inches (P000): 93.5 Days precipitation at or above 0.10 inches (P010): 70.1 Days Precipitation at or above 1.00 inches (P100): 9.5 Days Snowfall at or above 0.1 inches (S001): 15.3 Days Snowfall at or above 1.0 inches (S010): 10.6 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