Official 1981-2010 Climate Normals City: MT CARROLL State: IL ID: 115901 Latitude: 42.0981 Longitude: -89.9842 Elevation: 639.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.2 35.3 47.1 60.7 71.7 81.2 84.5 82.9 75.8 63.3 48.2 33.8 Mean: 20.7 25.4 36.7 48.7 59.5 68.8 72.6 70.7 62.5 50.6 38.4 24.9 Low: 11.2 15.5 26.3 36.7 47.3 56.5 60.6 58.6 49.3 37.9 28.5 15.9 CDD: 0 0 0 9 43 155 241 198 73 8 0 0 HDD: 1373 1109 878 498 214 40 7 19 147 454 800 1244 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 2.9 5.6 3.8 1.3 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 T000: 7.1 4.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 4.1 T032: 29.8 25.4 22.3 9.6 1.5 0.0 0.0 0.0 1.0 9.3 19.1 28.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 59.7 F Mean Temp: 48.4 F Low Temp: 37.1 F Cooling DD: 728 Heating DD: 6783 Days above 90 (T090): 14.2 Days above 100 (T100): 0.1 Days below 0 (T000): 16.1 Days below 32 (T032): 146.2 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.48 1.69 2.61 3.70 4.42 4.98 4.52 4.50 3.46 3.14 2.90 2.24 Snow: 9.6 6.2 3.5 0.7 0.0 0.0 0.0 0.0 0.0 0.1 1.2 8.9 Number of Days P001: 7.9 6.9 8.9 10.6 11.9 10.9 9.2 9.4 8.6 8.7 8.8 9.1 P010: 4.2 4.2 5.5 7.1 7.6 7.5 6.4 6.8 6.1 5.9 5.5 5.5 P100: 0.2 0.3 0.6 0.9 1.2 1.4 1.3 1.3 0.9 0.8 0.7 0.4 S001: 5.1 3.8 2.1 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.5 5.0 S010: 3.2 2.4 1.2 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.3 3.4 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: 39.64 inches Snowfall: 30.2 inches Days precipitation at or above 0 inches (P000): 110.9 Days precipitation at or above 0.10 inches (P010): 72.3 Days Precipitation at or above 1.00 inches (P100): 10.0 Days Snowfall at or above 0.1 inches (S001): 16.9 Days Snowfall at or above 1.0 inches (S010): 10.8 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