Official 1981-2010 Climate Normals City: STOCKTON 3 NNE State: IL ID: 118293 Latitude: 42.4006 Longitude: -89.9958 Elevation: 969.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 28.0 32.8 45.1 59.4 70.8 79.5 82.3 80.5 73.8 61.4 46.0 31.6 Mean: 19.7 24.6 35.7 48.3 59.3 68.5 71.7 69.8 62.1 50.4 37.5 23.7 Low: 11.5 16.3 26.4 37.1 47.9 57.6 61.1 59.0 50.5 39.4 29.0 15.8 CDD: 0 0 0 7 41 146 217 170 61 7 0 0 HDD: 1403 1132 907 509 216 40 9 23 146 460 825 1280 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 1.7 3.1 2.0 0.6 0.0 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: 6.8 3.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.3 T032: 29.6 25.4 22.9 8.0 0.8 0.0 0.0 0.0 0.5 7.1 18.2 28.8 ------------------------------------------------------------------------------------------ Annual Values High Temp: 57.7 F Mean Temp: 47.7 F Low Temp: 37.7 F Cooling DD: 649 Heating DD: 6951 Days above 90 (T090): 8.0 Days above 100 (T100): -777.7 Days below 0 (T000): 15.3 Days below 32 (T032): 141.3 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.05 1.37 2.21 3.62 3.82 4.98 3.87 4.60 3.69 3.06 2.66 1.70 Snow: 9.3 6.6 4.4 1.4 0.1 0.0 0.0 0.0 0.0 0.2 1.6 8.3 Number of Days P001: 7.4 7.0 9.0 11.1 11.7 10.8 9.3 9.9 8.8 9.0 8.8 9.0 P010: 3.0 3.3 4.9 6.9 8.0 7.4 6.3 6.7 6.1 5.8 5.2 4.3 P100: 0.1 0.2 0.5 0.9 0.9 1.5 0.9 1.4 1.1 0.8 0.6 0.2 S001: 5.6 4.5 2.9 0.8 0.0 0.0 0.0 0.0 0.0 0.2 1.5 5.5 S010: 3.2 2.5 1.6 0.4 0.0 0.0 0.0 0.0 0.0 0.1 0.7 3.3 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: 36.63 inches Snowfall: 31.9 inches Days precipitation at or above 0 inches (P000): 111.8 Days precipitation at or above 0.10 inches (P010): 67.9 Days Precipitation at or above 1.00 inches (P100): 9.1 Days Snowfall at or above 0.1 inches (S001): 21.0 Days Snowfall at or above 1.0 inches (S010): 11.8 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