XGY   Grimsby Mountain, ON
Weather Observed At   43-11  N    79-34  W
2025
Note all stats on this page use calendar days (0000-2359). MSC stats use "climate days" (normally 0800-0759).
2004-2020 NORMALS

 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
  HIGHEST : 4.8
9.2
 23.4
26.9
29.0
35.7
 34.1
35.0
 29.5
 
  
  
 35.7
   Date : 1/18 2/25
3/19 4/295/166/23
 7/6+ 8/12 9/18
       6/23
   Time : 0456 1412
 14501456 1436
 1521 1408 1351
 1508
   
   1521
   Normal :
11.9
10.8
17.5
25.031.132.834.0
32.8
31.426.118.512.8
34.8
  AVERAGE HIGH : -0.8
 		0.2
 		8.5
 		13.2
 		17.7
 		25.7
 		29.1
 		26.7
 		23.6
 		 
 		 
 		 
 		 
   Normal :
0.0
 		1.05.6
 		12.1
 		19.724.8
 		27.9
 		26.722.815.6
 		8.9
 		2.7
 		14.0
  AVERAGE :
 -4.5
 		-3.7
 		3.4
 		7.8
12.8
 		20.4
 		23.8
 		21.5
 		18.2
 		 
 		 
 		 
 		 
   Normal :
-3.8
 -3.3
 1.37.2
 14.0
 19.5
 22.6
 21.6
 18.0
 11.3
 4.9
 -0.5
 9.4
   Departure from Normal :
-0.7
-0.4
 +2.1
 		+0.6
 		-1.2
 +0.9
 		+1.2
 		-0.1
 +0.2
 		 
 
 
 
  AVERAGE LOW : -8.3
 		-7.6
 		-1.6
 		2.4
 		7.9
 		15.1
 		18.4
 		16.2
 		12.8
 		 
 		 
 		 
 		 
   Normal :
-7.6
 		-7.5
 		-3.0
 		2.38.4
 		14.2
 		17.4
 		16.6
 		13.2
 		7.0
 		0.9
 		-3.7
 		4.9
  LOWEST : -20.6
 -15.2
 -13.1
 -5.8
 4.0
 4.8
 12.7
 7.2
 6.5
  
  
  
 -20.6
   Date : 1/22
2/183/2
 4/95/10
 6/1
 7/4
 8/30
 9/8
  
   
 1/22
   Time : 0655 0718 0629
 0553
 0607 0551 0405 06590632       0655
   Normal :
-18.4 -17.4-12.1 -3.9 1.47.812.011.26.0-0.7-7.0 -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
 Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 REL. HUMIDITY  (%) Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
  HIGHEST : 97
 97
 99
 98
 98
 98
 98
 98
 98
  
  
  
 99
   Date : 1/31
2/163/31
 4/2+
 5/2+6/19
 7/1+
 8/209/17+
  
  
  
 3/31
   Time : 1850
0233
 0010
 2156
 0212
 0052
 0459
 0628
 1347
  
  
  
 0010
  AVERAGE :
73
 		76
 		69
 		66
 		73
 		72
 		71
 		69
 		73
 		 
 		 
 		 
 		 
   Normal :
75
73
 69
 67
 68
 70
 70
 72
 74
 76
 75
 78
 72
   Departure from Normal :
-2+3 0-1 +5 +2 +1 -3 -1     
  LOWEST : 40
 48
 28
 17
 26
 27
 32
 27
 32
  
  
  
 17
   Date : 1/9
2/10
 3/19
 4/27+
 5/9
 6/2
 7/6
 8/2
 9/3
  
  
  
 4/27+
   Time : 1453
1253
 1340
 1541
 1710
 1447
 1557
1511
 1454
  
  
  
 1541
 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
  HIGHEST : 3.5
 3.6
 15.2
 18.4
 19.2
 27.1
 25.0
 24.1
 20.7
  
  
  
 27.1
   Date : 1/1
2/3
 3/16
 4/29
 5/16
 6/22
 7/24
 8/12
 9/22
  
  
  
 6/22
   Time : 0000
1347
 1206
 1426
 1046
 1324
 1505
 10371256
  
  
  
 1324
  AVERAGE :-8.6
 		-7.4
 		-1.9
 		3.2
 		7.9
15.1
 		17.7
 		15.0
 		13.1
 		 
 		 
 		 
 		 
   Normal : -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
   Departure from Normal :
-1.3
 		0.0
+2.1
 		+2.3
 		+0.2
 		+1.6
 		+1.2
 		-1.2
 		-0.2
 		     
 		 
  LOWEST : -23.7
 -18.3
 -16.9
 -11.9
 -6.7
 0.5
 6.3
 4.1
 4.6
  
  
  
 -23.7
   Date : 1/22
2/18
 3/24/8
 5/11
 6/1
 7/18
 8/30
 9/8
  
  
  
 1/22
   Time : 0653
0423
 0629
 2129
 1643
 1423
 2312
 1140
 1813
  
  
  
 0653
  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 HIGH TOTAL : 147.7
131.1
146.0
180.1
193.8
189.6
186.1
202.7
224.3
231.9
239.4
133.6
1164.6
  TOTAL :38.0
 74.8
 60.2
 92.8
 117.2
 87.0
 51.4
 32.1
 48.3
  
  
  
  
   Normal Precipitation :
72.6
 69.8
 77.1
 100.9 80.9 83.2
 79.3 77.2
 76.6 101.8
 75.4
 85.3
 980.1
   % of Normal :
-48% +7% -22% -8% +45% +5% -35% -58% -37%     
  RECORD LOW TOTAL : 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
  RAIN / SNOW RATIO (%) :27/73
 		18/82
 		98/2 85/15
 		-
 		-
-
 		-
 		-
 		 
 		 
 		 
 		 
   Normal :
59/41
 		43/57
 		66/34
 		92/8100/0-
 		--
 		-100/0
 		88/12
 		64/36
 		 
  EVAPOTRANSPIRATION :-20.1
-22.2
 -56.9
 -82.8
 -95.1
 -126.8
-132.0
 -112.0
 -82.0
  
  
  
  
  NET MOISTURE : +17.9
 		+52.6
 		+3.3
 		+10.0
 		+22.1
 		-39.8
 		-80.6
 		-79.9 -33.7
 		 
 		 
 		 
 		 
 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 HIGH TOTAL : 130.9
100.0
144.2
175.5
193.8
189.6
186.1
202.7
224.3
231.9
230.0
127.4
1027.2
  TOTAL :10.3
13.2
59.2
78.8
117.2
87.0
51.4
32.1
48.3
 
 
 
 
   Normal :
43.0
29.7
51.1
92.680.983.2
79.377.2
76.6101.4
66.254.3
835.5
  RECORD LOW TOTAL : 0
0
4.3
14.5
12.7
14.4
13.9
11.4
7.1
9.9
10.7
0
447.5
  RECORD IN 1 DAY : 52.1
40.6
 51.6
 52.0
 68.6
 78.0
 72.6
 90.2
 77.0
 115.3
 60.2
 57.4
 115.3
  MOST IN 1 DAY : 3.8
 4.4
 17.0
 31.4
 35.2
 57.0 18.1
 18.6
 18.6
  
  
  
 57.0
   Date : 1/31
2/27
 3/5
 4/2
 5/226/18
 7/13
 8/17
 9/24
  
  
  
 6/18
  HEAVIEST RAIN RATE : (mm/h) 5.0
 		4.2
 		110.8
 		69.8
 		245.2
 		180.0
 		177.2
 		80.0
 		67.8
 		 
 		 
 		 
 		245.2
   Date : 1/31
2/273/30 4/21
 5/16
 6/18
 7/13
 8/17
 9/4
  
  
  
 5/16
   Time : 0754
0754
 2359
 1623
 0440
 1353
 1245
0628
 0911
  
  
  
 0440
 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 HIGH TOTAL : 98.6
110.4
74.8
40.0
2.5
0
0
0
0
18.0
42.0
107.3
246.4
  TOTAL :57.8
 49.6
 0.4
 3.2
 -
 -
 		-
 		-
 		-
 		 
 		 
  
  
   Normal :
34.6
38.7
22.0
6.2
TR
0
0
0
0
0.1
8.1
30.1
139.8
   % of Normal :
+67% +28% -98% -48% -
         
 		    
  RECORD LOW TOTAL : 3.0
0.4
0
0
0
0
0
0
0
0
0
3.8
54.7
  RECORD IN 1 DAY : 50.8
40.6
38.1
27.8
2.5
-
-
-
-
11.4
22.9
61.0
61.0
  MOST IN 1 DAY : 17.0
 13.0
 0.2
 3.0
 -
 		-
 		-
 		-
 		-
 		 
 		 
  
 17.0
   Date : 1/31
 2/16
 3/23+
 4/2
 -
 -
-
-
-
 
  
  
 1/31
  WATER EQUIVALENT RATIO : 20.98.1
2.5
2.4
-
 		-
 		-
 		-
 		-
 		 
 		 
 
 
   Normal :
11.7
 		9.6
 		8.5
 		7.6
 		1.7-
 		-
 		-
 		-
 		1.5
 		8.8
 		9.7
 		10.0
  HIGHEST SNOW ON GROUND : 25
 45
 21
 3
 -
 -
 		-
 		-
 		-
 		 
 		 
  
 45
   Date : 1/31
 2/17+
 3/1
 4/2
 -
 -
 -
 -
 -
  
  
  
 2/17+
   Normal : 19272240-
- - -
0
51531
  AVERAGE SNOW ON GROUND : 8
 		29
 		6
 		TR
 		-
 		-
 		-
 		-
 		-
 		 
 		 
 		 
 		 
   Normal :
8148TR
0-
- - -
0
143
  SNOW ON GND. AT END OF MONTH : 9
 		23
 		0
 		0
 		-
 		-
 		-
 		-
 		-
 		 
 		 
 		 
 		-
   Normal :
121520
0-
- - -
0
16-
  Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
 
 WIND (kt / °)
 Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
  HIGHEST VELOCITY / DIRECTION : 200
 200
 170
 200
 230
 300
 280
 040
 200
  
  
  
 200
                                   / SPEED :
36
29
30
32
22
22
25
24
22
 
 
 
36
  Date : 1/27
2/24
 3/6
 4/29
 5/17
 6/19
 7/17
 8/20
 9/5
  
  
  
 1/27
  Time : 1838
1349
 0101
 1244
 1253
 1825
 1351
 1819
 1552
  
  
  
 1838
  AVERAGE DAILY PEAK GUST :
19.5
 		17.7
 		19.6
 		17.6
 		12.4
 		12.8
 		11.9
 		12.6
 		11.0
 		 
 		 
 		 
 		 
  PEAK WIND DIRECTION : (days)











   NORTH :
3
 		7
 6
 9
 11
 11
 17
 13
 14
  
  
  
 91
   NORTHEAST :
-
 1
 3
 1
 5
 1
 -
 5
 3
  
  
  
 19
   EAST :
-
 4
 -
 2
 1
 3
 1
 1
 2
  
  
  
 14
   SOUTHEAST :
-
 -
 2
 -
 -
 -
 -
 1
 -
  
  
  
 3
   SOUTH :
13
 6
 8
 6
 4
 8
 3
 2
 3
  
  
 		 
 		53
   SOUTHWEST :
2
 2
 4
 3
 3
 3
 -
 4
 1
  
  
  
 22
   WEST :
13
 8
 7
 8
 5
 2
 8
 4
 5
  
  
  
 60
   NORTHWEST :
-
 -
 1
 1
 2
 2
 2
 1
 2
  
  
  
 11
 Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
  
 PRESSURE (in.)Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
  HIGHEST S.L.P.  :
 30.48
 30.64
 30.26
 30.47
 30.42
30.22
 30.25
 30.38
 30.36
  
  
  
 30.64
   Date :
1/21+
2/143/2
 4/20
 5/11
 6/13
 7/31
 8/6
 9/8
  
  
  
 2/14
   Time :
2333
0948
 0930
 1252
 1048
 0920
 2354
 1131
 1152
  
  
  
 0948
   Normal :
30.67 30.56 30.55 30.47 30.3730.2330.2430.25 30.41 30.46 30.56 30.62 30.75
  AVERAGE S.L.P. :
29.98
 		30.05
 		29.83
 		30.01
 		29.95
 		29.98
 		30.01
 		30.10
 		30.07
 		 
 		 
 		 
 		 
   Normal :
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
   Departure from Normal :
-0.04
 		+0.03
 		-0.22
 		+0.06
 		-0.01
 		+0.07
 		+0.09
 		+0.15
 		+0.03
 		       
  LOWEST S.L.P. :
 29.27
 29.27
 29.12
 29.43
 29.42
 29.58
 29.70
 29.79
 29.59
  
  
  
 29.12
   Date :
1/28
2/28
 3/5
 4/15
 5/17
 6/19
 7/17
 8/24
 9/4
  
 
  
 3/5
   Time :
 2311
2020
 1829
 0953
 1045
 1351
 0855
 1556
 0641
  
  
  
 1829
   Normal :
29.27 29.3129.37 29.2829.5129.51 29.59 29.6029.50 29.37 29.30 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 :
-
-
 1
4
2
 4
 4
 3
 4
 
  
  
22
   Normal :
001246763
2
 00 31
  RAIN :
 5
 4
 13
 16
 19
 16
 14
 11
 11
  
  
  
 109
   Normal :
7510141615141312
18129146
  DRIZZLE :
 -
 2
 2
 3
 3
 -
 -
 3
 1
  
  
  
14
   Normal :
213221002
33423
  HAIL :
 -
 -
 -
 --
 -
 -
 -
 -
  
 -
 -
0
   Normal :
- - - 00000-
0- - 1
  FREEZING RAIN : -
 3
 1
 1
 -
 -
 -
 -
 -
 -
  
  
5
   Normal :
1110- - - - -
- 014
  FREEZING DRIZZLE : -
 6
 -
 -
 -
 -
 -
 -
 -
 -
  
  
6
   Normal :
110- - - - - -
- 013
  ICE PELLETS :
 1
 4
 3
 3
 -
 -
 -
 -
 -
  
  
  
11
   Normal :
111
10
- - - -
0017
  SNOW : 28
 20
 9
 5
 -
 -
 -
 -
 -
  
  
  
62
   Normal :
21171150- - - -
171678
  SNOW PELLETS :  -
 -
 -
 -
 -
 -
 -
 -
 -
  
  
  
0
   Normal :
01000-
- - -
0103
  SNOW GRAINS : -
1
 1
-
-
-
-
-
-
 
  
 
2
   Normal :
10
0- - -
- - -
0012
  ICE CRYSTALS : -
-
 -
-
-
-
-
-
-
-
-
 
0
   Normal :
00
-
- - - - - -
- - 0
0
 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
  FOG : 2
3
 5
2
8
-
 -
-
4
 
  
 
24
  FREEZING FOG : -
-
 1
-
-
-
-
-
-
-
  
 
1
  FOG OR FREEZING FOG : 2
 		3
 		5
 		2
 		8
 		-
 		-
 		-
 		4
 		 
 		 
 		 
 		24
   Normal :
224442111
33329
  BLOWING SNOW : -
2
 -
-
-
-
-
-
-
-
 
 
2
   Normal :
1100- - - - -
- 003
  HAZE : -
-
 -
1
-
6
7
5
-
 
  
 
19
   Normal :
012143543
01226
  SMOKE : -
-
-
-
-
3
2
5
-
-
-
-
10
   Normal :
---------
---0
  AURORA : -
-
-
-
-
1
-
-
-
-
-
-
1
   Normal :
---------
---0
 Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR

 BRIGHT SUNSHINE (h)
 Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
  BRIGHT SUNSHINE DURATION :
92114 173 204 239 252 239 216 189        
   Normal :
72
119
182
205
255
256
246
219
180
129
8148
1992
   % of Normal :
+28%-4% -5% E
-6% -2% -3% -1% +5%   
 
 
   % of Possible :
32%39%47%52% 52% 55% 52% 50% 50%   
 
 
  MAX. SOLAR RADIATION : (W/m²)
 782
 912
 1030
 1230
 1292
 1404
 1234
 1232
 1032
  
  
  
 1404
   Date :
1/29
2/18
 3/26
 4/15
 5/25
 6/1
 7/26
 8/29
 9/7
  
  
  
 6/1
   Time :
1219
1352
 1258
 1343
 1340
 1421
 1255
 1419
 1401
  
  
  
 1421
   Normal :
6758601022 1209 1192 1245 1193 1119 1030 896 687 531 1271
  AVERAGE DAILY MAX. SOLAR RADIATION : (W/m²)
429514 703 836 883 1010 986 901 826        
   Normal :
359521675844909994956924761576417284685
 Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
 
 DARK SKY (m/a"2) Jan
 Feb
 Mar
 Apr
 May
 Jun
 Jul
 Aug
 Sep
 Oct
 Nov
 Dec
 YEAR
  DARKEST SKY :
19.97
19.84
 20.21
 19.98
 20.14
 20.16
 20.41
 20.36
 20.33
  
  
  
 20.41
   Date :
1/4
2/28
 3/31
 4/30
 5/24
 6/25
 7/1
 8/21
 9/26
  
  
  
 7/1
   Time :
0251
0130
0330
 0320
 0235
 0050
 0005
 01510330


0005
   Normal :
20.24
20.06
20.27
20.25
20.27
20.32
20.31
20.43
20.44
20.48
20.32
20.23
20.61
  AVERAGE DAILY DARKEST SKY :
19.20
 18.79
 19.53
 19.30
 19.43
 19.63
 19.81
 19.83
 19.89



   Normal :
19.1819.1319.4419.5819.7119.8219.9219.9819.8919.7519.5519.1219.59
   Departure From Normal :
+0.02 -0.34
 		+0.09
 		-0.28
 		-0.28
 		-0.19
 		-0.11
 		-0.15
 		0.00



 Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
YEAR
 
All times are local.
+ indicates first of multiple occurences (on different dates).
End of month S.O.G. defined as S.O.G. at 7 AM on last day of the month.
Days With Precipitation include trace amounts.
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 Station 1993/10/01-2003/09/17, and Grimsby Mountain 2003/09/18 to present.




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