XGY   Grimsby Mountain, ON
43-11-00  N    79-33-34  W
Normals :   1971-2000
Records :  1910-          
+ indicates most recent of multiple occurrences.
Note all stats on this page use  "climate days" rather than calendar days.  
             
 TEMPERATURE : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Average Temperature : (°C)
-5.5
-4.9
0.1
6.3
12.8 18.4
21.4
20.5
15.6
9.3
3.7
-2.6
7.9
  Record Warm Month : 1.3
0.8
5.3
9.5
17.2
22.2
24.9
23.7
21.1
13.8
8.5
2.7
11.4
  Year : 1932
19982000
1998
1998 2005
1921+
2001
2002
1947
2001
2001
1998
  Record Cold Month : -11.7 -13.3
-5.9
2.7
8.5
14.8
18.5
17.4
12.9
5.4
-0.7
-7.3
5.5
  Year : 1918
19341960
1926
1917+
1928
1920
1927
1918
1925
1933
1917 1917
  Avg Maximum Temperature : -2.0
-1.2 4.2
11.1
18.5
23.9
26.7
25.5
20.4
13.4
7.0
0.8
12.4
  Record High Temperature : 17.8
19.7
18.0
27.0
30.6
37.2
36.1
41.1
40.6
38.3
30.4
24.4
21.0
41.1
  Date : 25th
23rd
21st
31st
26th
31st
3rd
9th
25th
3rd
8th
3rd
3rd
7/9
  Year : 1950
2017
1997
1998
1957
1919
1934
1936
1948
1953
2007
1961
1982
1936
  Avg Minimum Temperature : -9.0
-8.5
-4.0
1.5
7.1
12.8
16.1
15.5
11.1
5.1
0.4
-6.0
3.5
  Record Low Temperature : -27.8 -29.4
-22.8
-17.2
-4.4
1.7
5.6
1.1
-0.6
-9.4
-15.6
-28.9
-29.4
  Date : 25th
5th19th
1st
4th
3rd
15th
30th
30th
29th
16th
27th
2/5
  Year : 1945
19181916
1923
1935
1928
1930
1965
1935
1965
1933
1925 1918
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 RELATIVE HUMIDITY : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Average Rel Humidity : (%)
74
69
72
62
68
68
68
72
77
77 79 80 72
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 DEW POINT : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Average Dew Point : (°C)
-9.4
-9.6
-4.3
0.3
7.0 12.3
15.3
15.3
11.5
5.5
0.4
-5.6
3.2
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 PRECIPITATION : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Total Precip : (mm)
71.9
53.6
62.6
76.4
76.3
80.7
77.1
74.2
93.5
74.9 69.9 73.5 884.6
  Record Wet Month :
147.7
131.1
146.0
180.3
140.6
193.8
189.6
184.6
202.7
210.2
228.0
239.4
133.6
1164.6
  Year :
1932
2008
1913
2017
1996
1942
2000
1992
1956
1977
1954
1985
1990
1996
  Record Dry Month :
9.5
17.2
18.7
15.7
12.7
14.4
13.9
11.4
7.1
9.9
10.7
19.9
540.4
  Year :
1961
1987
1915
1946
1920
1988
1918
1974
1960
1952
1930
1919
1941
  Record Precip in 1 Day :
52.1
40.6
51.6
41.9
68.6
78.0
72.6
90.2
77.0
115.3
60.2
61.0
115.3
  Date :
19th
16th
1st
20th
25th
11th
12th
29th
29th
15th
4th
12th
10/15
  Year :
1929
1954+
1972
1943
1953
1922
1962
1950
1924
1954
1985
1944
1954
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 RAINFALL : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Total Rainfall : (mm)
29.3
25.5 44.2
68.2
76.1
80.7
77.1
74.2
93.5
74.7
64.0
43.3
750.8
  Record Rainiest Month : 130.9
100.0
144.2
175.7
131.1
193.8
189.6
184.6
202.7
210.2
228.0
230.0
127.4
1027.2
  Year :
1932
1938
1976
2017
1929
1942
2000
1992
1956
1977
1954
1985
1990
2006
  Record Least Rainfall : 0
0
4.3
14.5
12.7
14.4
13.9
11.4
7.1
9.9
10.7
0
447.5
  Year :
1918+
1920+
1915
1946
1920
1988
1918
1974
1960
1952
1930+
1910
1941
  Record Rainfall in 1 Day : 52.1
40.6
51.6
52.0
35.6
68.6
78.0
72.6
90.2
77.0
115.3
60.2
57.4
115.3
  Date :
19th
16th
1st
20th
2nd
25th
11th
12th
29th
29th
15th
4th
21st
10/15
  Year :
1929
1954
1972
2017
1917
1953
1922
1962
1950
1924
1954
1985
1949
1954




























  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 SNOWFALL : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Total Snowfall : (cm)
49.6
32.6
18.0
8.1
0.2
0
0
0
0
0.1
6.0
33.4
148.0
  Record Snowiest Month : 98.6
110.4
74.8
40.0
2.5
0
0
0
0
18.0
42.0
107.3
246.4
  Year :
1939 1911
1916
1979
1923
+
+
+
+
1962
1933
1944
1940
  Record Least Snowfall : 3.0
0.4
0
0
0
0
0
0
0
0
0
3.8
54.7
  Year :
1953 1998
1985
+
+
+
+
+
+
+
+
1950
1919
  Record Snowfall in 1 Day : 50.8
40.6
38.1
27.8
2.5
-
-
-
-
11.4
22.9
61.0
61.0
  Date  : 31st 15th
18th 6th
10th
-
-
-
-
24th
17th
12th
12/12
  Year : 1939 1911
1936
1994
1923
-
-
-
-
1962
1920
1944
1944
  Record Snow On Ground : -
-
-
-
-
-
-
-
-
-
-
-
61
  Date  : -
-
-
-
-
-
-
-
-
-
-
-
12/12
  Year : -
-
-
-
-
-
-
-
-
-
-
-
1944
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 PRESSURE : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Average Pressure : (in)
30.00
30.04
29.99
29.98
29.96
29.96
29.98
30.02
30.04
30.05 30.02 30.03 30.01
  Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

Records from Grimsby 1910-13, Rock Chapel 1914-1966/04/17, Royal Oak 1966/04/18-1974, Grimsby 1975-1985/08/20,
     Rittenhouse 1985/08/21-1993/09/30, Vineland 1993/10/01-2003/09/17, and Grimsby Mountain 2003/09/18 to present.

Niagara Region
Records :1872-Present
* indicates Niagara Peninsula record

Temperature Record High
(°C)
 Location
Date
Year
Record Low
(°C)
 Location
Date
Year
  January : 22.2
 Niagara Falls
26th
1950
-32.8
 Welland
25th
1884
  February : 20.5
 Welland
26th
2000
-31.1
*-36.7
 Welland
 Caledonia
9th
9th
1934
1934
  March : 27.0
 Fort Erie
 Welland
 Vineland
 Vineland - Rittenhouse
21st
31st
31st
30th
2012
1998
1998
1998
-27.8
 Welland
4th
1873
  April : 33.0
 Niagara Falls
28th
1990
-18.3
 Welland
1st
1923
  May : 37.2
 Grimsby - Rock Chapel
31st
1919
-6.1
*-6.7 
 Welland
 Port Dover
6th
22nd
1932
1935
  June : 37.0
 Power Glen
8th
1984
0.0
*-1.7  
 St Catharines - CDA
 Port Dover
8th
9th
1949
1931
  July : 41.1
 Grimsby - Rock Chapel
9th
1936
3.9
3.9
*3.3 
*3.3 

 Niagara Falls - Hydro
 Welland
 Port Dover
 Caledonia
11th
11th
12th
11th
1945
1945
1898
1945
  August : 40.6
 Grimsby - Rock Chapel
25th
1948
0.5
*-0.6   
 Welland
 Canborough
29th
30th
1982
1965
  September : 38.3
 Grimsby - Rock Chapel
3rd
1953
-2.2
*-3.9 
 Welland
 Hagersville
10th
23rd
1883
1974
  October : 32.8
 Niagara Falls
5th
1951
-9.4
-9.4
 Smithville
 Grimsby - Rock Chapel
29th
29th
1965
1965
  November : 27.2
 St Catharines - CDA
 Vineland Station

3rd
3rd
1961
1961
-20.0
 Welland
26th
1880
  December : 22.0
*22.5 
 Port Dalhousie
 Hamilton - Lab
3rd
3rd
1982
1982
-27.8
*-29.4 
*-29.4 

 Welland
 Caledonia
 Port Dover

27th
20th
26th

1925
1942
1914

  YEAR : 41.1
 GRIMSBY - Rock Chapel 7/9
1936
-32.8
*-36.7 
 WELLAND
 CALEDONIA
1/25
2/9
1884
1934
  Record High
 Location
Date
Year
Record Low
 Location
Date
Year

 Precipitation Record Rain in
  1 Day (mm)
Location
Date
Year
Record Snow in
  1 Day (cm)
Location
Date
Year
  January : 52.8
*81.3 
Welland
Port Dover
7th
21st
1998
1959
78.7
Welland
22nd
1902
  February : 82.8
Niagara Falls
16th
1954
61.0
Welland
12th
1894
  March : 51.6
Grimsby Rock Chapel
1st
1972
81.3
Welland
1st
1900
  April : 51.1
*88.4 
Niagara Falls
Port Dover
29th
26th
1921
1937
43.2
Welland
11th
1894
  May : 68.6
Grimsby Rock Chapel
25th
1953
14.8
Fort Erie
7th
1989
  June : 108.7
Port Colborne
25th
1968
0
-
-
-
  July : 141.0
Welland
3rd
1892
0
-
-
-
  August : 107.7
*115.6 
Grimsby
Hamilton PH
28th
8th
1950
1981
0
-
-
-
  September : 118.4
Welland
30th
1959
TR
(ice pellets)
Ridgeville
23rd
1989
  October : 122.7
Grimsby
15th
1954 20.3
*24.6 
Welland
Hamilton PH
31st
25th
1873
1962
  November : 78.2
*86.4 
Port Colborne
Port Dover
4th
7th
1985
1951
58.4
Fort Erie
14th
1974
  December : 71.9
Niagara Falls
29th
1954
66.0
Vineland Station
11th
1944
  YEAR : 141.0
WELLAND
7/3
1892
81.3
WELLAND
3/1
1900
  Record Rain
in 1 Day
Location
Date
Year
Record Snow
in 1 Day
Location
Date
Year

 Precipitation Record
Snow Depth (cm)
Location
Date
Year
 


  January : 70
Thorold
15th 1999




  February : 62
*64 
Ridgeville
Hamilton A
29th
7th
1984
1978




  March : 61
Balls Falls
1st 1984




  April : 30
Niagara Falls
1st
1987



  May : 9
Niagara Falls
7th
1989




  June : 0
-
-
-




  July : 0
-
-
-




  August : 0
-
-
-




  September : 0
-
-
-




  October : TR
*2 
-
Hamilton A
-
21st
-
1989




  November : 44
Fort Erie
22nd
2000



  December : 82
Fort Erie
28th
2001




  YEAR : 82
FORT ERIE 12/28
2001




  Record
Snow Depth
Location
Date
Year




Snow Depth data incomplete..currently being researched.

 Wind Record
Sustained
Dir
Location
Date
Year
Record Gust
Dir
Location
Date
Year
  January : 48
*48 
89
89
SW
SW
Niagara District A
Hamilton A
-
-
-
-
74
137
S
Niagara District A
26th 1978
  February : 50
93
NW Grass Island  -
-
59
*66 
109
122
230
SW
Port Colborne LS
Hamilton A
4th
27th
2003
1997
  March : 56 104
230
Port Colborne LS
9th
2002
73
135
230
Port Colborne LS
9th
2002
  April : 50
93
SW
Port Colborne LS -
-
74
137
SW
Niagara District A
3rd
1982
  May : 40
74
SW
Port Colborne LS -
-
52
*57 
96
105
SW
SW
Niagara District A
Hamilton A
10th
16th
1990
1973
  June : 35
*37 
65
69
SW
SW
Niagara District A
Hamilton A
-
-
-
-
62
115
SW
Niagara District A
12th
1978
  July : 34
63
SW
Niagara District A -
-
58
107
S
Niagara District A
5th
1991
  August : 37
69
SW
Port Colborne LS -
-
55
102
W
Niagara District A
1st
1995
  September : 42
77
SW
Port Colborne LS
-
-
-
-
72
133
W
Niagara District A
2nd
1980
  October : 49 91
230
Port Colborne LS 25th
2001
67
124
230
Port Colborne LS
25th
2001
  November : 54
100
250
Port Colborne LS
13th
2003
67 124
250
Port Colborne LS
13th
2003
  December : 56
104
230
Port Colborne LS 12th
2000
69 128
230
Port Colborne LS
12th
2000
  YEAR : 56
104
230
PORT COLBORNE LS
3/9
2002
+

74
137
SW
NIAGARA DISTRICT A
4/3
1982+
  Record
Sustained
Dir
Location
Date
Year
Record Gust
(kt - km/h)
Dir
Location
Date
Year
Wind data incomplete..currently being researched.
Grimsby Mountain normals computed as follows..
1) Double-mass analysis between Grimsby and Rock Chapel for avbl concurrent data 1914-66. Grimsby Mountain temp differences/pcpn ratios interpolated from this data for elevation.
2) Double-mass analysis between Grimsby, Hamilton A, and Niagara District A for avbl concurrent data 1970-85. Grimsby 1971-2000 normals derived from Hamilton A + Niagara District A 1971-2000 normals using this analysis.
3) Grimsby Mountain differences/ratios applied to Grimsby 1971-2000 normals.
4) Hamilton A normal liquid-to-snow ratios applied to Grimsby Mountain pcpn totals to account for Grimsby C.S. using standard 10:1 ratio instead of actual measurements of water equivalent.
5) April & May normal snowfalls calculated manually to account for sparse data producing unacceptable analomies..