Grand Chain Dam Climate Normals

Official 1981-2010 Climate Normals

City: GRAND CHAIN DAM
State: IL
ID: 113580
Latitude: 37.2036
Longitude: -89.0422
Elevation:  384.7 ft

Temperature-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    42.1   46.7   56.7   67.3   75.8   84.3   88.6   88.1   81.9   70.1   57.7   44.8
Mean:    33.8   38.1   46.4   56.5   65.8   73.9   78.5   77.8   70.8   59.0   48.3   36.9
 Low:    25.6   29.6   36.2   45.8   55.8   63.5   68.3   67.5   59.7   47.9   38.9   28.9
 CDD:       0      0      1     17    100    275    417    397    200     36      2      0
 HDD:     966    752    576    271     75      8      1      0     27    222    503    872

Number of Days
T090:     0.0    0.0    0.0    0.0    0.3    5.2   13.1   11.5    2.7    0.1    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.4    0.0    0.0    0.0    0.0
T000:     0.3    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0
T032:    22.4   17.0    9.9    2.3    0.0    0.0    0.0    0.0    0.0    1.1    6.6   19.1
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Annual Values

 High Temp:    67.1 F
 Mean Temp:    57.3 F
  Low Temp:    47.4 F
Cooling DD:    1447
Heating DD:    4273

Days above  90 (T090):    32.9
Days above 100 (T100):     0.4
Days below   0 (T000):     0.4
Days below  32 (T032):    78.4
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Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    3.85   3.90   4.48   4.81   4.96   4.30   3.36   2.87   3.30   4.06   4.51   4.60
Snow:     2.1    3.3    0.7    0.0    0.0    0.0    0.0    0.0    0.0    0.1    0.0    1.8

Number of Days
P001:     9.6    8.6    9.7   10.2   10.5    9.3    7.5    5.8    7.2    7.3    8.4    9.9
P010:     6.7    6.1    7.4    7.3    8.5    7.0    5.2    4.4    5.0    5.3    6.3    6.9
P100:     1.1    0.7    1.2    1.3    1.6    1.3    1.2    0.9    1.1    1.2    1.1    1.0
S001:     1.1    1.5    0.2    0.0    0.0    0.0    0.0    0.0    0.0    0.1    0.0    0.8
S010:     0.7    0.9    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.1    0.0    0.6
S100:     0.0    0.1    0.1    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:   49.00 inches
     Snowfall:     8.0 inches

   Days precipitation at or above 0 inches (P000):   104.0
Days precipitation at or above 0.10 inches (P010):    76.1
Days Precipitation at or above 1.00 inches (P100):    13.7
      Days Snowfall at or above 0.1 inches (S001):     3.7
      Days Snowfall at or above 1.0 inches (S010):     2.4
     Days Snowfall at or above 10.0 inches (S100):     0.2

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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