Photo: P199 · CC BY-SA 3.0July in Chelsea runs hotter than in 83% of Canadian towns
Nights in January average −16.0°C. In January, nights here are colder than in 75% of Canadian towns. Some 43°C separates winter nights from summer afternoons. About 137 days a year bring 1 mm of precipitation or more.
No ECCC station in Chelsea has 1991–2020 normals; the page reads Luskville, 17 km west, instead.
A year in Chelsea at a glance
Each month’s typical high and low, in °C.
What stands out about Chelsea’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Quebec beside it.
What a year in Chelsea feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
About 170 frosts and 119 warm days a year
The frost season runs September to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 27 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 968 mm a year
June is the wettest month and February the driest.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 193 cm in a normal year
The snow season runs October to April; January brings the most, about 53 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Chelsea
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Degree days add up how far each day’s mean temperature falls below 18°C over a year.
Living with Chelsea’s climate
Gardening, time outside, winter cold and summer heat, from the 1991–2020 normals.
Plant out after about 20 May; the first frost of autumn usually arrives near 22 September, leaving roughly 124 days without frost.
The outdoor season by the averages is Jun, Jul, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →A typical year is calm by definition; Chelsea’s hazards page covers the exceptions.
Flood & hazards →ECCC’s normals location: Luskville
Luskville is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 17 km west |
| Station altitude | 69 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −40.0°C |
| Hottest reading, 1991–2020 | 36.4°C |
| Next-nearest location | Ottawa (City), 20 km |
How Chelsea 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 Quebec.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Chelsea’s would only repeat its figures.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Chelsea Luskville | 26.9°C | −16.0°C | 968 mm |
| Cantley 5.2 km · Angers | 26.2°C 0.7°C cooler | −16.5°C 0.5°C colder | 938 mm |
| Hautes-Plaines 8.5 km · Ottawa (City) | 26.7°C about the same | −14.0°C 2.0°C milder | 938 mm |
Chelsea weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.4°C | −16.0°C | −10.9°C | 77 mm | 53 cm |
| February | −3.2°C | −15.3°C | −9.2°C | 63 mm | 43 cm |
| March | 2.6°C | −8.4°C | −3.0°C | 63 mm | 31 cm |
| April | 11.3°C | −0.2°C | 5.7°C | 74 mm | 6 cm |
| May | 19.8°C | 6.4°C | 13.1°C | 79 mm | 0 cm |
| June | 24.5°C | 11.6°C | 18.1°C | 99 mm | 0 cm |
| July | 26.9°C | 13.9°C | 20.2°C | 97 mm | 0 cm |
| August | 25.7°C | 12.8°C | 19.2°C | 96 mm | 0 cm |
| September | 21.2°C | 8.6°C | 14.9°C | 87 mm | 1 cm |
| October | 13.3°C | 2.8°C | 8.1°C | 84 mm | 1 cm |
| November | 5.6°C | −3.1°C | 1.4°C | 74 mm | 16 cm |
| December | −1.8°C | −10.5°C | −6.3°C | 76 mm | 43 cm |
| Year | 11.7°C | 0.2°C | 5.9°C | 968 mm | 193 cm |
January varies most from one year to the next (3.5°C), August least
Over 1991–2020, March saw both −34.0°C (2003) and 28.0°C (2012), the widest span of any month.
Where Chelsea’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Luskville, the nearest location with a full year of temperatures.
- 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: hours of sunshine, missing from the 1991–2020 normals, and a height correction: the town has no elevation on file.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Chelsea’s climate
How warm does Chelsea get in summer?
Afternoons average 26.9°C in July, the warmest time of year.
How cold does Chelsea get in winter?
Of all twelve months, January has the coldest nights, about −16.0°C.
How much rain and snow does Chelsea get?
The year adds up to 968 mm. June is the peak month (99 mm) and February the low one (63 mm).
How long does snow stay on the ground?
Snow covers the ground, 1 cm or more, on about 108 days a year.
Are these figures for Chelsea itself?
They describe Luskville, the nearest normals location, rather than Chelsea itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Chelsea →
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).