Photo: William B. Grice · CC BY-SA 4.0Summer arrives in force in Grimsby, hotter than in 88% of Canadian towns
January mornings start at about −6.8°C. Only about 117 nights a year bring a frost, fewer than in 86% of Canadian towns. The gap between a January night and a July afternoon is 34°C. For walks and days out, May, June, August and September bring highs of 19–26°C.
Borrowed figures: Grimsby has no normals station, so these come from Vineland, 12 km east.
A year in Grimsby at a glance
Each month’s typical high and low, in °C.
What stands out about Grimsby’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Grimsby feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 117 days, 20°C on 124
Frosts fall from October to April; January has the most, about 27. Heat of 30°C or more comes on about 18 days a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 838 mm of rain and snow a year
April brings the most rain and snow; February, the least. Some 112 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Snowfall: about 141 cm in a normal year
From November to April snow is likely; January is the peak, at about 44 cm.
Snowfall by month
Centimetres
ECCC’s Vineland normals leave snowfall out; the figures here come from Welland-Pelham, 34 km away.
Heating a home in Grimsby
93% of a year’s heating need falls between October and April. Months averaging under 10°C: November to April.
The count adds up, day by day, how far the mean temperature falls short of 18°C. By this count, homes here need less heating than 88% of Canadian towns.
Living with Grimsby’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Afternoons of 17–27°C and nights of at least 8°C arrive in May, Jun, Aug and Sep.
Parks & trails →Wind chill falls below −20 on about 11 days a year: cover skin and dress in layers.
The air feels heavier than 30 on the humidex for about 61 days a year.
Thirty years of averages say little about one bad storm; Grimsby’s hazards page does.
Flood & hazards →ECCC’s normals location: Vineland
ECCC builds the Vineland normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 12 km east |
| Station altitude | 95 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Snowfall from | Welland-Pelham, 34 km |
| Coldest reading, 1991–2020 | −24.5°C |
| Hottest reading, 1991–2020 | 37.4°C |
| Average wind | 12.9 km/h on average, most often from the south-west |
| Next-nearest location | Burlington Piers, 22 km |
How Grimsby compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used in Ontario.
Nearby towns’ climate
Nearby places read from a different ECCC location (places on Grimsby’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Grimsby Vineland | 27.1°C | −6.8°C | 838 mm |
| Fifty Point 6.3 km · Burlington Piers | 25.5°C 1.6°C cooler | −6.3°C 0.5°C milder | 838 mm |
| Smithville 11 km · Vineland | 27.1°C about the same | −6.8°C about the same | 838 mm |
Grimsby weather by month
Month by month, 1991–2020: the usual high, low and mean, the rain and snow, and the snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | 0.2°C | −6.8°C | −3.3°C | 71 mm | 44 cm |
| February | 0.8°C | −6.4°C | −2.9°C | 52 mm | 24 cm |
| March | 5.3°C | −2.6°C | 1.4°C | 62 mm | 28 cm |
| April | 11.6°C | 2.4°C | 7.0°C | 83 mm | 5 cm |
| May | 18.6°C | 8.0°C | 13.3°C | 70 mm | 0 cm |
| June | 24.1°C | 14.0°C | 19.1°C | 78 mm | 0 cm |
| July | 27.1°C | 17.2°C | 22.2°C | 74 mm | 0 cm |
| August | 26.1°C | 16.6°C | 21.4°C | 69 mm | 0 cm |
| September | 22.3°C | 12.9°C | 17.6°C | 69 mm | 0 cm |
| October | 15.5°C | 7.1°C | 11.3°C | 77 mm | under 1 cm |
| November | 8.9°C | 1.5°C | 5.2°C | 72 mm | 9 cm |
| December | 3.2°C | −3.0°C | 0.1°C | 62 mm | 32 cm |
| Year | 13.6°C | 5.1°C | 9.4°C | 838 mm | 141 cm |
From year to year, February moves by 2.8°C, more than any month, and August least
March has the widest record range, −19.2°C in 2003 to 27.0°C in 1998; the tick on each bar is the month’s normal.
Where Grimsby’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Vineland, the closest ECCC location with twelve months of temperature normals.
- Other locations: precipitation and snowfall come from the nearest location that publishes all twelve months of them, as named above.
- Comparisons: the towns and neighbourhoods of 2,500+ across Canada, each on its nearest normals location, without the city totals or the reserves.
- Not on this page: sunshine (no 1991–2020 normals exist for it) and any altitude adjustment, since there is no elevation for the town itself.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Grimsby’s climate
How warm does Grimsby get in summer?
July is the warmest month, with average highs of 27.1°C.
How cold does Grimsby get in winter?
A typical January night falls to −6.8°C, the year’s low point.
How much rain and snow does Grimsby get?
Count on roughly 838 mm a year, heaviest in April (83 mm) and lightest in February (52 mm).
Are these figures for Grimsby itself?
Only indirectly: the readings are made at Vineland, outside Grimsby.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Grimsby →
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).