Official 1981-2010 Climate Normals City: LA HARPE State: IL ID: 114823 Latitude: 40.5839 Longitude: -90.9686 Elevation: 689.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 33.1 37.9 50.2 63.0 73.1 82.3 86.1 84.5 77.2 65.3 50.6 36.6 Mean: 24.1 28.3 39.8 51.7 62.1 71.7 75.3 73.5 65.3 53.4 40.6 27.7 Low: 15.1 18.7 29.3 40.5 51.1 61.0 64.5 62.6 53.4 41.5 30.6 18.9 CDD: 0 0 1 12 63 219 321 270 107 13 0 0 HDD: 1268 1027 784 410 153 19 1 5 98 373 732 1155 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 3.4 8.2 6.3 1.7 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.6 0.0 0.0 0.0 0.0 T000: 4.4 2.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.8 T032: 29.2 24.7 19.3 5.6 0.3 0.0 0.0 0.0 0.1 5.5 16.9 27.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 61.8 F Mean Temp: 51.2 F Low Temp: 40.7 F Cooling DD: 1006 Heating DD: 6025 Days above 90 (T090): 20.2 Days above 100 (T100): 1.0 Days below 0 (T000): 9.5 Days below 32 (T032): 128.9 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.49 1.75 2.66 3.90 4.80 4.75 4.64 3.73 3.79 3.09 2.94 2.28 Number of Days P001: 5.8 5.3 7.3 9.5 10.8 8.9 8.7 8.4 7.4 7.7 7.4 6.7 P010: 3.8 3.8 5.6 7.6 8.4 7.0 6.7 6.5 5.9 5.7 5.9 5.2 P100: 0.3 0.4 0.5 0.9 1.5 1.4 1.5 1.1 1.0 0.7 0.6 0.4 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 39.82 inches Days precipitation at or above 0 inches (P000): 93.9 Days precipitation at or above 0.10 inches (P010): 72.1 Days Precipitation at or above 1.00 inches (P100): 10.3 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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