XGY   Grimsby Mountain, ON
43-11  N    79-34  W
Records :  1910-Present
Normals :  2004-2020    
! recently updated !       
Normals are now specifically for Grimsby Mountain and are no longer derived from neighbouring stations.
+ indicates most recent of multiple occurrences.
Note all stats on this page use  "climate days" rather than calendar days.  
Year values do not always match monthly values due to rounding and other reasons.
             
 TEMPERATURE (C) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  RECORD HIGHEST : 17.8
19.7
27.0
30.6
37.2
36.1
41.1
40.6
38.3
32.0
25.8
21.0
41.1
   
   
1/25
2/23
3/31
4/26
5/31
6/3
7/9
8/25
9/3
10/1
11/5
12/3
7/9
1950
2017
1998
1957
1919
1934
1936
1948
1953
2019
2022
1982
1936
  AVERAGE MONTHLY HIGH : 11.9
10.817.5
25.0
31.1
32.8
34.0
32.8
31.4
26.1
18.5
12.8
34.8
  AVERAGE DAILY HIGH : 0.0
1.05.6
12.1
19.7
24.8
27.9
26.7
22.8
15.6
8.9
2.7
14.0














  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
   
1932
19982000
1998
1998 2005
2020+
2001
2002
1947
2001
2001
1998
  AVERAGE TEMPERATURE :
-3.8
-3.3
1.3
7.2
14.019.5
22.6
21.6
18.0
11.3
4.9
-0.5
9.4
  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
   

1918
19341960
1926
1917+
1928
1920
1927
1918
1925
1933
1917 1917













  AVERAGE DAILY LOW : -7.6
-7.5
-3.0
2.3
8.4
14.2
17.4
16.6
13.2
7.0
0.9
-3.7
4.9
  AVERAGE MONTHLY LOW : -18.4
-17.4
-12.1
-3.9
1.4
7.8
12.0
11.2
6.0
-0.7
-7.0 -12.2 -20.5
  RECORD LOWEST : -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
   
   
1/25
2/53/19
4/1
5/4
6/3
7/15
8/30
9/30
10/29
11/16
12/27
2/5
1945
19181916
1923
1935
1928
1930
1965
1935
1965
1933
1925 1918
  AVERAGE FIRST FROST :
OCT 24
  AVERAGE LAST FROST :
APR 27
 
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 :
75
73
69
67
68
70
70
72
74
7675 78 72
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 DEW POINT (C) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  AVERAGE :
-7.3
-7.4
-4.1
0.9
7.7 13.5
16.5
16.2
13.3
7.2
1.0
-3.7
4.5
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 PRECIPITATION (mm) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  RECORD WET MONTH :
147.7
131.1
146.0
180.1
193.8
189.6
184.6
202.7
224.3
231.9 239.4
133.6
1164.6
 
1932
2008
1913
2017
1942
2000
1992
1956
2021
2021
1985
1990
1996
  AVERAGE MONTHLY : 72.6
69.8
77.1
100.9
80.9
83.2
79.3
77.2
76.6
101.875.4 85.3 980.1
  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
 
1961
1987
1915
1946
1920
1988
1918
1974
1960
1952
1930
1919
1941














  RECORD IN ONE DAY :
52.1
40.6
51.6
41.9
68.6
78.0
72.6
90.2
80.3 115.3
60.2
61.0
115.3
 
 
1/19
2/16
3/1
4/20
5/25
6/11
7/12
8/29
9/22
10/15
11/4
12/12
10/15
1929
1954+
1972
1943
1953
1922
1962
1950
2021
1954
1985
1944
1954
  AVERAGE RAIN / SNOW RATIO (%)  : 59/41
43/57
66/34
92/8
100/0
-
-
-
-
100/0
88/12
64/36
85/15
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 RAINFALL (mm) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  RECORD RAINIEST MONTH : 130.9
100.0
144.2
175.5
193.8
189.6
184.6
202.7
224.3 231.9 230.0
127.4
1027.2
  
1932
1938
1976
2017
1942
2000
1992
1956
20212021
1985
1990
2006
  AVERAGE MONTHLY :
43.0
29.751.1
92.6
80.9
83.2 79.3
77.2
76.6
101.4
66.2
54.3
835.5
  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
  
1918+
1920+
1915
1946
1920
1988
1918
1974
1960
1952
1930+
1910
1941














  RECORD IN ONE DAY : 52.1
40.6
51.6
52.0
68.6
78.0
72.6
90.2
80.3
115.3
60.2
57.4
115.3
 
  
1/19
2/16
3/1
4/20
5/25
6/11
7/12 8/29
9/22
10/15
11/4
12/21
10/15
1929
1954
1972
2017
1953
1922
1962
1950
2021
1954
1985
1949
1954
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 SNOWFALL (cm) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  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
  
1939 1911
1916
1979
1923
+
+
+
+
1962
1933
1944
1940
  AVERAGE MONTHLY : 34.6
38.7
22.0
6.2
TR
0
0
0
0
0.1
8.1
30.1
139.8
  RECORD LEAST SNOWFALL : 3.0
0.4
0
0
0
0
0
0
0
0
0
3.8
54.7
 
1953 1998
1985
+
+
+
+
+
+
+
+
1950
1919
  RECORD IN ONE DAY : 50.8
40.6
38.1
27.8
2.5
-
-
-
-
11.4
22.9
61.0
61.0
  
  
1/312/15
3/18 4/6
5/10
-
-
-
-
10/24
11/17
12/12
12/12
1939 1911
1936
1994
1923
-
-
-
-
1962
1920
1944
1944
  AVERAGE WATER EQUIVALENT RATIO : 11.7
9.6
8.5
7.6
1.7
-
-
-
-
1.5
8.8
9.7
10.0
  RECORD SNOW ON GROUND :











61
  












12/12












1944
  AVERAGE HIGHEST SNOW ON GROUND : 19
27
22
4
0
-
-
-
-
0
5
15
31
  AVERAGE SNOW ON GROUND : 8
14
8
TR
0
-
-
-
-
0
1
4
3
  AVG. SNOW ON GROUND AT END OF MONTH : 1215
2
0
0
-
-
-
-
0
1
6

 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Average Snow on Ground on Christmas Day = 7 cm. Probability of White Christmas (2+ cm s.o.g.) = 59%.

 PRESSURE (in) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  AVERAGE MONTHLY HIGH :
30.67
30.56
30.55
30.47
30.37
30.23
30.24
30.25
30.41
30.46 30.56 30.62 30.75
  AVERAGE SEA-LEVEL PRESSURE :
30.02
30.02
30.05
29.95
29.96
29.91
29.92
29.95
30.04
30.00 30.05 30.03 29.99
  AVERAGE MONTHLY LOW :
29.27
29.31
29.37
29.28
29.51
29.51
29.59
29.60
29.50
29.3729.30 29.3129.11
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 DAYS WITH : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  THUNDERSTORM :
0
0
1
2
4
6
7
6
3
20031
  RAIN :
7
5
10
14
16
15
14
13
12
1812 9 146
  DRIZZLE :
2
1
3
2
2
1
0
0 2
33423
  HAIL :
-
-
-
0 0
0
0
0
-
0 -- 1
  FREEZING RAIN :
1
1 1
0
-
-
-
-
-
- 0 1 4
  FREEZING DRIZZLE :
1 1
0
-
- -
-
-
-
- 01 3
  ICE PELLETS :
1
1
1
1
0
-
-
-
-
0 0 1 7
  SNOW :
21 17
11
5
0
-
-
-
-
171678
  SNOW PELLETS :
0 1
0
0
0
-
-
-
-
01 03
  SNOW GRAINS :
1 0
0 -
-
-
-
-
- 00 12
  FOG OR FREEZING FOG :
2
2
4
4
4
2
1
1 1
33 329
  BLOWING SNOW :
1 1
0
0
-
-
-
-
-
-0 03
  HAZE :
0 1
2 1
4 3
5
4
3
01 226
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  (Days-With include any occurrence, incl. trace amounts of pcpn)

 SOLAR RADIATION (w/m2) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  AVERAGE MONTHLY HIGH :
675
860
1022
1209
1192 1245 1193
1119
1030
896 687 531 1271
  AVERAGE DAILY MAXIMUM :
359
521
675
844
909
994
956
924 761
576 417 284 685
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Normals for period 2015-2022

 SUNSHINE (h) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  BRIGHT SUNSHINE :
72
119
182
205
255 256 246
219
180
129 81 48 1992
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  Normals for period 2015-2022 (Observation site does not conform to standards)

 DARK SKY (m/a"2) : Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  AVERAGE MONTHLY DARKEST :
20.24
20.06
20.27
20.25
20.27 20.32 20.31
20.43
20.44
20.4820.3220.23 20.61
  AVERAGE NIGHTLY DARKEST :
19.17
19.12
19.44
19.58
19.71
19.82
19.92
19.98 19.90
19.7519.55 19.11 19.59
 
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
   Normals for period 2010-2022


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 (C) Record High
 Location
Date
Year
Record Low
 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.