Cairo Climate Normals

Official 1981-2010 Climate Normals

City: CAIRO 3N 
State: IL
ID: 093809
Latitude: 37.0422
Longitude: -89.1856
Elevation:  312.9 ft

Temperature-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    42.7   47.9   58.5   69.6   78.1   86.2   89.0   88.1   81.3   70.3   57.9   45.6
Mean:    34.0   38.5   47.7   58.0   67.5   75.6   78.9   77.5   69.9   58.8   48.1   37.3
 Low:    25.2   29.1   36.9   46.4   56.9   65.1   68.8   67.0   58.6   47.2   38.3   28.9
 CDD:       0      0      4     35    135    323    431    390    186     35      3      0
 HDD:     962    742    541    245     58      4      0      1     38    229    510    861

Number of Days
T090:     0.0    0.0    0.0    0.2    1.1    9.1   14.2   11.4    3.7    0.1    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.2    0.2    0.4    0.0    0.0    0.0    0.0
T000:     0.5    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.2
T032:    23.3   17.5    9.9    1.7    0.0    0.0    0.0    0.0    0.0    1.4    7.1   19.7
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Annual Values

 High Temp:    68.0 F
 Mean Temp:    57.7 F
  Low Temp:    47.4 F
Cooling DD:    1543
Heating DD:    4189

Days above  90 (T090):    39.8
Days above 100 (T100):     0.8
Days below   0 (T000):     0.8
Days below  32 (T032):    80.6
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Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    3.69   3.77   4.05   4.63   5.27   3.91   4.14   3.01   3.19   4.05   4.46   4.47
Snow:     1.6    1.7    0.3    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.8

Number of Days
P001:     8.3    9.5    9.8   10.8   10.6    9.1    7.9    6.9    6.4    7.9    9.1   10.1
P010:     5.4    5.9    6.9    7.3    7.8    6.3    5.7    4.8    4.2    5.9    7.0    7.0
P100:     1.0    1.3    0.9    1.6    1.8    1.1    1.3    1.1    0.9    1.4    1.5    1.0
S001:     1.4    1.1    0.4    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.6
S010:     0.6    0.5    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.2
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:   48.64 inches
     Snowfall:     4.4 inches

   Days precipitation at or above 0 inches (P000):   106.4
Days precipitation at or above 0.10 inches (P010):    74.2
Days Precipitation at or above 1.00 inches (P100):    14.9
      Days Snowfall at or above 0.1 inches (S001):     3.5
      Days Snowfall at or above 1.0 inches (S010):     1.4
     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