Official 1981-2010 Climate Normals City: LACON 1N State: IL ID: 114805 Latitude: 41.0411 Longitude: -89.4061 Elevation: 459.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 33.7 38.8 51.1 65.1 75.0 84.0 87.1 85.6 78.9 66.5 51.6 37.0 Mean: 26.1 30.4 41.4 53.6 63.5 72.6 76.2 74.5 67.0 55.1 42.6 29.5 Low: 18.5 22.0 31.6 42.2 51.9 61.2 65.3 63.4 55.0 43.7 33.6 22.0 CDD: 0 0 2 18 79 242 348 299 132 20 0 0 HDD: 1206 969 735 359 127 14 1 4 74 327 673 1100 Number of Days T090: 0.0 0.0 0.0 0.0 0.6 5.7 9.8 7.5 2.5 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.3 0.0 0.0 0.0 0.0 T000: 2.8 1.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.5 T032: 26.7 22.3 17.0 4.2 0.2 0.0 0.0 0.0 0.1 3.3 13.9 25.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.0 F Mean Temp: 52.8 F Low Temp: 42.6 F Cooling DD: 1141 Heating DD: 5588 Days above 90 (T090): 26.2 Days above 100 (T100): 0.8 Days below 0 (T000): 5.8 Days below 32 (T032): 113.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.92 1.84 3.05 3.71 4.41 3.86 3.72 3.56 3.19 3.11 3.17 2.29 Snow: 7.0 5.2 3.0 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.8 6.2 Number of Days P001: 9.3 7.8 10.6 11.2 11.5 9.4 9.0 8.7 7.6 9.4 9.9 9.9 P010: 4.3 3.9 6.2 7.9 7.4 6.7 6.5 6.5 4.8 6.0 6.3 4.9 P100: 0.5 0.3 0.6 0.7 1.5 1.0 0.9 1.0 0.8 0.6 0.9 0.5 S001: 5.7 4.1 2.1 0.3 0.0 0.0 0.0 0.0 0.0 0.0 1.1 5.1 S010: 2.1 1.7 0.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.2 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: 37.83 inches Snowfall: 23.0 inches Days precipitation at or above 0 inches (P000): 114.3 Days precipitation at or above 0.10 inches (P010): 71.4 Days Precipitation at or above 1.00 inches (P100): 9.3 Days Snowfall at or above 0.1 inches (S001): 18.4 Days Snowfall at or above 1.0 inches (S010): 7.4 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