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Top 30 Wettest MAYS - WINNIPEG (since 1873)

Rank

Rainfall (mm)

Snowfall (cm)

Precipitation (mm)

Rank

1

177.7

1977

32.5

1931

177.7

1977

1

2

166.2

2022

29.0

2002

166.2

2022

2

3

160.0

2010

24.4

1890

162.1

1911

3

4

158.0

1911

23.1

1967

160.0

2010

4

5

155.2

1974

22.0

2004

156.0

1974

5

6

135.1

1896

15.2

1882

135.1

1896

6

7

133.9

1933

13.7

1905

134.0

2004

7

8

131.6

1962

8.9

1968

133.9

1933

8

9

125.5

1880

8.6

1950

132.3

1962

9

10

122.6

1978

8.4

1938

125.5

1880

10

11

121.2

1877

8.3

1979

122.6

1978

11

12

119.4

1927

6.6

1953

121.2

1877

12

13

116.1

1959

6.1

1885

119.9

1953

13

14

114.7

2024

6.1

1907

119.4

1927

14

15

113.3

1953

5.8

1954

117.6

1959

15

16

110.5

2001

5.1

1876

117.3

1950

16

17

108.7

1950

4.8

1963

114.7

2024

17

18

104.1

1930

4.8

1991

110.5

2001

18

19

103.1

1973

4.1

1911

104.4

1930

19

20

101.5

2004 E

4.1

1943

103.1

1973

20

21

100.0

1998

4.1

1966

100.0

1998

21

22

98.3

1902

3.2

2008

99.1

1968

22

23

97.5

2012 E

3.0

1972

98.3

1902

23

24

97.0

1999

2.8

1915

97.5

2012 E

24

25

93.5

1895

2.8

1916

97.0

1999

25

26

91.9

1941

2.8

1975

95.0

1895

26

27

91.2

1912

2.5

1891

93.1

1979

27

28

90.4

1965

2.5

1949

91.9

1941

28

29

89.7

1968

2.5

2015

91.4

1965

29

30

86.4

1903

2.0

1926

91.2

1912

30


Data Notes:
1870 - An unofficial 152.4 mm of rain, according to the Open Data Rescue Project (James Stewart obs). 
1871 - James Stewart 45.9 mm rain/precip included in graphs but not table.
1872 - James Stewart 96.6 mm rain/precip included in graphs but not table.
1910 - 4.8 cm snowfall on May 28 was erroneous and eliminated, resulting in only 1.0 cm for the month. Observer notes from St John's College revealed that the rain amounts were mistakenly entered in the snow column for the date. Further evidenced by the fact that the snow amounts were entered when temperatures were 14-15c, far too warm for snow to fall. The observer, in their notes, also reported that rain was falling, not snow. The monthly summary from the observer showed no snow, and instead rain (4.8 mm) on the date. In addition, newspapers (note that this paper's 2.2 inches of rain is an error for 0.22 inches) had no mention of snowfall. They instead talked about rains that fell. 
1938 - St John's College had 18.1 cm of snow.
2004 - Rainfall is considered estimated due to mixed precipitation on the 11th and 12th. Accuracy is within a few mm. 
​2012 - Decided to eliminate a spurious 0.5 mm on the 17th. 
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