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Waterloo, Iowa
H I S T O R I C A L   W E A T H E R   D A T A

Average Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F46.514.620.134.248.360.269.173.170.361.950.135.720.3
C8-9-6191520222116102-6
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average High Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F56.923.729.443.359.371.680.583.981.573.761.845.228.9
C13-4-16152226282723167-1
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average Low Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F365.410.62537.148.757.662.2595038.426.211.7
C2-14-11-329141615103-3-11
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Highest Recorded Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F1055866871009410310510598957965
C40141830373439404036352618
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Lowest Recorded Temperature
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
F-34-31-29-34-4253842382211-17-27
C-36-35-33-36-20-3353-5-11-27-32
Years Charted: 45 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Days Below 32F/0C
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days1573127241110001102230
Years Charted: 34 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Precipitation
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
in.33.70.81.082.33.34.084.474.833.643.512.571.821.3
mm855202758831031131229289654633
Years Charted: 30 Source: National Weather Service, San Francisco
Results based on data collected from 1961 - 1990


Average Snowfall
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
in.32.16.96.661.7000000.13.67.2
mm8151751671524300000291182
Years Charted: 39 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Wind Speed
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
mph10.711.511.412.412.711.1108.68.49.210.211.211.2
km/h17181819201716131314161818
Years Charted: 37 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Days of Precipitation
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days1037691011101099778
Years Charted: 43 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Cloudy Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days175161518161412111112131818
Years Charted: 33 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Partly Cloudy Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days1007678101112118876
Years Charted: 33 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Mean Number of Clear Days
 TotalJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
Days9087667789101057
Years Charted: 33 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Morning Relative Humidity
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
%83778082828183869089848382
Years Charted: 34 Source: National Weather Service, San Francisco
Results based on data collected through 1993


Average Afternoon Relative Humidity
 YearJan.Feb.Mar.Apr.MayJun.Jul.Aug.Sep.Oct.Nov.Dec.
%62706865555555595959566672
Years Charted: 34 Source: National Weather Service, San Francisco
Results based on data collected through 1993





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