Winter nights in Brockville are colder than in 95% of Canadian towns
High summer brings afternoon highs near 25.8°C. Precipitation is light here, less than falls on 72% of Canadian towns. July is the wettest month here, with about 5.8 times the rain and snow of February. Garden chairs stay out from June to August, the months with highs of 23–26°C.
Read at Winnipeg Richardson (Airport), 8.8 km north: ECCC’s normals for 1991–2020.
A year in Brockville at a glance
Each month’s typical high and low, in °C.
What stands out about Brockville’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Manitoba beside it.
What a year in Brockville feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
193 frost days and 110 days above 20°C a year
The frost season runs September to May, and January freezes nearly every night. Some 52 nights a year drop under −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
519 mm of precipitation in a typical year
About 80 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 126 cm of snow a year
From October to May snow is likely; December is the peak, at about 27 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Brockville
91% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A day averaging 10 degrees under 18°C adds 10 to the total; warm days add nothing. A house here needs more heating than 89% of Canadian towns.
Living with Brockville’s climate
What the normals mean for a garden, a day outside and the depth of winter.
On average the last spring frost comes around 23 May and the first autumn frost around 22 September: about 122 frost-free days between.
The comfortable months for a day outside, highs of 17–27°C and nights of 8°C or more: Jun, Jul and Aug.
Parks & trails →Frostbite weather, a wind chill under −20, turns up on about 86 days a year.
Roughly 37 days a year feel hotter than 30 once humidity is counted.
Averages smooth over blizzards, ice storms, floods and heat waves; Brockville’s hazards page covers the risks.
Flood & hazards →ECCC’s normals location: Winnipeg Richardson (Airport)
Winnipeg Richardson (Airport) is a composite: ECCC joins 4 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 8.8 km north |
| Station altitude | 239 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −41.8°C |
| Hottest reading, 1991–2020 | 37.8°C |
| Average wind | 17.5 km/h on average, most often from the south |
| Next-nearest location | Portage Southport, 78 km |
How Brockville compares
Against the 2,611 Canadian towns and neighbourhoods of 2,500 or more, each read from its own normals location; the dots are the other locations those towns use in Manitoba.
Nearby towns’ climate
Places around Brockville whose figures come from another normals location. Distances here run 42–49 km: that is how far the nearest places with figures are from Brockville.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Brockville Winnipeg Richardson (Airport) | 25.8°C | −21.2°C | 519 mm |
| Cartier 42 km · Portage Southport | 25.4°C about the same | −19.1°C 2.1°C milder | 493 mm |
| Brokenhead 47 km · Pinawa | 25.2°C 0.6°C cooler | −21.7°C 0.5°C colder | 571 mm |
| St-Pierre-Jolys 47 km · Emerson | 26.0°C about the same | −20.4°C 0.8°C milder | 543 mm |
Brockville weather by month
Average daily high and low, mean temperature, rain and snow (as water) and snowfall by month, 1991–2020.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −11.4°C | −21.2°C | −16.3°C | 18 mm | 25 cm |
| February | −8.8°C | −19.3°C | −14.1°C | 13 mm | 12 cm |
| March | −0.9°C | −11.2°C | −6.1°C | 26 mm | 19 cm |
| April | 10.0°C | −2.5°C | 3.8°C | 33 mm | 14 cm |
| May | 18.1°C | 4.2°C | 11.1°C | 70 mm | 4 cm |
| June | 23.3°C | 10.9°C | 17.1°C | 74 mm | 0 cm |
| July | 25.8°C | 13.2°C | 19.5°C | 77 mm | 0 cm |
| August | 25.4°C | 11.9°C | 18.7°C | 74 mm | 0 cm |
| September | 19.6°C | 6.9°C | 13.3°C | 53 mm | 0 cm |
| October | 10.4°C | −0.2°C | 5.1°C | 38 mm | 4 cm |
| November | 0.1°C | −8.8°C | −4.4°C | 25 mm | 21 cm |
| December | −8.2°C | −17.3°C | −12.7°C | 19 mm | 27 cm |
| Year | 8.6°C | −2.8°C | 2.9°C | 519 mm | 126 cm |
A March here can run from −37.4°C to 23.7°C
December is the least predictable month: about two years in three its average lands within 4.1°C of the normal, −12.7°C. July is the steadiest, within 1.4°C.
Where Brockville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Winnipeg Richardson (Airport), the closest ECCC location with twelve months of temperature normals.
- Comparisons: Canadian towns and neighbourhoods of at least 2,500, each placed by its nearest location (city totals and reserves excluded).
- Not on this page: a sunshine figure (ECCC published none for 1991–2020) and any lapse-rate correction for height, as the town has no elevation here.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Brockville’s climate
How warm does Brockville get in summer?
Peak warmth comes in July, at about 25.8°C by mid-afternoon.
How cold does Brockville get in winter?
On a normal January night the air drops to −21.2°C, the coldest of the year.
How much rain and snow does Brockville get?
519 mm a year counting snow as water. The wettest month is July (77 mm); the driest, February (13 mm).
Are these figures for Brockville itself?
They are the normals for Winnipeg Richardson (Airport), measured just outside Brockville itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Brockville →
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).