Official 1981-2010 Climate Normals City: NEW BOSTON DAM State: IL ID: 116080 Latitude: 41.1922 Longitude: -91.0578 Elevation: 547.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.6 36.4 48.7 62.4 72.8 82.5 86.2 84.0 76.8 63.8 49.6 35.3 Mean: 22.7 27.7 39.1 51.5 62.2 71.9 75.9 73.5 65.4 53.4 40.5 27.7 Low: 14.8 19.1 29.5 40.7 51.6 61.4 65.5 63.0 54.0 43.0 31.3 20.1 CDD: 0 0 0 7 64 227 337 268 95 14 0 0 HDD: 1311 1043 803 410 151 18 1 4 83 374 737 1156 Number of Days T090: 0.0 0.0 0.0 0.0 0.6 4.2 8.2 4.7 0.9 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 T000: 4.6 2.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.8 T032: 29.1 24.4 19.9 5.1 0.3 0.1 0.0 0.0 0.0 3.3 16.2 26.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 60.9 F Mean Temp: 51.1 F Low Temp: 41.3 F Cooling DD: 1012 Heating DD: 6091 Days above 90 (T090): 18.8 Days above 100 (T100): 0.1 Days below 0 (T000): 8.5 Days below 32 (T032): 124.6 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.21 1.55 2.63 3.24 4.54 4.10 3.49 3.89 3.32 2.91 2.32 1.82 Number of Days P001: 6.8 7.1 8.8 9.5 10.9 9.3 7.8 8.6 7.2 7.8 8.3 8.1 P010: 3.8 3.8 5.1 7.0 7.8 6.9 5.7 6.3 4.7 5.3 5.0 4.6 P100: 0.1 0.3 0.5 0.8 1.1 1.2 1.0 1.0 0.9 0.9 0.3 0.2 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 35.02 inches Days precipitation at or above 0 inches (P000): 100.2 Days precipitation at or above 0.10 inches (P010): 66.0 Days Precipitation at or above 1.00 inches (P100): 8.3 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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