Official 1981-2010 Climate Normals City: MONMOUTH State: IL ID: 115768 Latitude: 40.9442 Longitude: -90.6381 Elevation: 720.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 32.8 37.8 51.2 64.8 74.3 82.6 85.8 84.4 78.0 65.8 50.6 36.0 Mean: 24.3 28.9 40.6 52.7 62.5 71.4 74.8 73.1 65.7 54.3 41.2 27.9 Low: 15.7 19.9 30.0 40.6 50.6 60.2 63.8 61.8 53.5 42.9 31.8 19.9 CDD: 0 0 1 14 65 210 305 257 110 15 0 0 HDD: 1263 1012 758 383 144 18 1 6 88 345 714 1148 Number of Days T090: 0.0 0.0 0.0 0.1 0.6 3.4 7.1 5.4 1.3 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.4 0.0 0.0 0.0 0.0 T000: 4.1 2.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.4 T032: 28.5 23.9 18.3 5.7 0.2 0.0 0.0 0.0 0.2 3.8 15.6 26.9 ------------------------------------------------------------------------------------------ Annual Values High Temp: 62.1 F Mean Temp: 51.6 F Low Temp: 41.0 F Cooling DD: 978 Heating DD: 5881 Days above 90 (T090): 18.0 Days above 100 (T100): 0.8 Days below 0 (T000): 8.8 Days below 32 (T032): 123.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.66 1.87 2.75 3.92 4.75 4.36 4.21 4.07 3.54 3.06 2.82 2.37 Snow: 8.4 5.5 3.0 1.1 0.0 0.0 0.0 0.0 0.0 0.1 1.2 5.6 Number of Days P001: 7.1 6.6 8.7 10.2 11.8 9.7 8.9 8.7 7.7 8.8 8.6 7.6 P010: 4.3 4.4 6.3 7.5 8.2 7.2 5.9 6.3 5.5 6.0 5.7 5.0 P100: 0.2 0.3 0.4 1.0 1.2 1.3 1.3 0.9 0.9 0.6 0.7 0.5 S001: 4.0 3.2 1.2 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.9 3.3 S010: 2.6 2.2 0.9 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.6 2.5 S100: 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 39.38 inches Snowfall: 24.9 inches Days precipitation at or above 0 inches (P000): 104.4 Days precipitation at or above 0.10 inches (P010): 72.3 Days Precipitation at or above 1.00 inches (P100): 9.3 Days Snowfall at or above 0.1 inches (S001): 13.0 Days Snowfall at or above 1.0 inches (S010): 9.2 Days Snowfall at or above 10.0 inches (S100): 0.2 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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