Official 1981-2010 Climate Normals
City: OTTAWA 5SW
State: IL
ID: 116526
Latitude: 41.3283
Longitude: -88.9106
Elevation: 524.8 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 31.5 36.4 48.8 62.4 72.4 81.0 84.1 82.6 76.7 64.8 50.0 35.6
Mean: 23.3 27.7 39.0 51.2 61.5 70.7 74.2 72.5 65.3 53.5 41.0 27.6
Low: 15.1 19.0 29.3 40.0 50.5 60.4 64.4 62.4 53.9 42.1 32.0 19.6
CDD: 0 0 1 11 59 197 290 241 104 13 0 0
HDD: 1292 1044 805 425 169 26 3 9 95 371 720 1159
Number of Days
T090: 0.0 0.0 0.0 0.0 0.5 2.6 4.8 3.9 1.4 0.0 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0
T000: 4.4 2.4 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.4
T032: 28.8 25.0 19.7 5.5 0.4 0.0 0.0 0.0 0.1 3.5 14.8 26.9
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Annual Values
High Temp: 60.6 F
Mean Temp: 50.7 F
Low Temp: 40.8 F
Cooling DD: 916
Heating DD: 6120
Days above 90 (T090): 13.2
Days above 100 (T100): 0.2
Days below 0 (T000): 9.2
Days below 32 (T032): 124.7
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 1.48 1.43 2.46 3.22 4.11 3.98 3.85 3.89 3.26 2.80 3.11 2.13
Snow: 7.6 4.6 2.7 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.2 4.5
Number of Days
P001: 8.4 6.8 9.4 11.0 11.3 9.8 8.8 9.0 7.7 8.9 9.4 9.2
P010: 4.1 3.3 5.5 6.9 7.4 6.4 6.2 6.1 5.6 5.2 5.9 5.0
P100: 0.2 0.1 0.4 0.6 1.3 1.1 1.0 1.3 0.8 0.4 0.8 0.4
S001: 4.5 3.1 1.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.3 3.4
S010: 3.0 2.4 0.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.1 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
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Annual Values
Precipitation: 35.72 inches
Snowfall: 20.1 inches
Days precipitation at or above 0 inches (P000): 109.7
Days precipitation at or above 0.10 inches (P010): 67.6
Days Precipitation at or above 1.00 inches (P100): 8.4
Days Snowfall at or above 0.1 inches (S001): 12.8
Days Snowfall at or above 1.0 inches (S010): 8.8
Days Snowfall at or above 10.0 inches (S100): 0.0
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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
