Climate guideThirty-year normals for Grimsby, Canada
Grimsby climate by month
Hot-summer humid continental · DfaBest May–Jun · Sep
Annual mean10°day and night
Seasonal swing26°warmest vs coolest
Precipitation964 mm162 wet days a year
43.20° N, 79.57° WElevation 88 mUTC−4 · Eastern Daylight Time
When to goGrimsby · weather score
Best timeMay–Jun · Sep
October: high / low16° / 7°
iSummary
What the weather is like
Grimsby has a hot-summer humid continental climate (Köppen Dfa): warm summers, cold winters and precipitation in every season.
The warmest month is July, when afternoons average 28° and nights 18°. January is the coolest month, with highs of 1° and lows of -7°. The difference between the warmest and the coolest month is about 26°, a large swing typical of continental interiors.
About 964 mm of precipitation falls in an average year. October is the wettest month (80 mm, 16 wet days) and February the driest (65 mm, 11 wet days). Cloud cover ranges from 28% in July to 54% in January.
Compared with Ottawa, the capital, Grimsby is 1.2° warmer on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 28° · July
- Coldest nights
- -7° · January
- Wettest month
- October
- Driest month
- February
- Clearest skies
- July · 28% cloud
- Longest day
- 15 h 22 min
- Shortest day
- 9 h 00 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 1° | 1° | 6° | 13° | 20° | 25° | 28° | 27° | 23° | 16° | 9° | 4° |
| Average low | -7° | -7° | -3° | 2° | 8° | 15° | 18° | 17° | 13° | 7° | 2° | -3° |
| Precipitation | 71 mm | 65 mm | 70 mm | 86 mm | 83 mm | 85 mm | 89 mm | 82 mm | 90 mm | 80 mm | 88 mm | 75 mm |
| Wet days (≥1 mm) | 14.2 | 10.5 | 11.2 | 12.5 | 12.3 | 14.7 | 14.7 | 15.2 | 10.8 | 15.7 | 14.2 | 15.7 |
| Cloud cover | 54% | 47% | 43% | 42% | 37% | 33% | 28% | 29% | 33% | 39% | 48% | 53% |
| Daylight | 9h 20 | 10h 32 | 11h 53 | 13h 24 | 14h 40 | 15h 22 | 15h 04 | 13h 58 | 12h 32 | 11h 05 | 9h 44 | 9h 00 |
| Month score | 15 | 26 | 26 | 37 | 68 | 65 | 54 | 58 | 73 | 53 | 18 | 15 |
ivMonth by month
Grimsby in every month
January15
1° / -7°
71 mm · 14.2 wet days
February26
1° / -7°
65 mm · 10.5 wet days
March26
6° / -3°
70 mm · 11.2 wet days
April37
13° / 2°
86 mm · 12.5 wet days
May68
20° / 8°
83 mm · 12.3 wet days
June65
25° / 15°
85 mm · 14.7 wet days
July54
28° / 18°
89 mm · 14.7 wet days
August58
27° / 17°
82 mm · 15.2 wet days
September73
23° / 13°
90 mm · 10.8 wet days
October53
16° / 7°
80 mm · 15.7 wet days
November18
9° / 2°
88 mm · 14.2 wet days
December15
4° / -3°
75 mm · 15.7 wet days