Photo: BrockvilleFact · CC BY-SA 4.0Frosty mornings in Brockville are scarcer than in 72% of Canadian towns
Expect July afternoons of about 26.1°C. Precipitation is plentiful here, more than falls on 69% of Canadian towns. The wettest month is July; the driest is February. Plan for rain or snow on about 129 days a year, the days with 1 mm or more.
Figures: ECCC’s 1991–2020 normals for Brockville (6.0 km north-west).
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 Ontario beside it.
What a year in Brockville feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
140 frost days and 118 days above 20°C a year
The frost season runs October to April, and January freezes nearly every night. Deep cold, under −20°C, comes on about 8 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
1,017 mm of precipitation in a typical year
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
180 cm of snow in a typical year
The snow season runs October to April; January brings the most, about 50 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Brockville
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Warm days count for nothing; each colder day adds how far its mean sits below 18°C. In heating terms, homes need less heating than 70% of Canadian towns.
Living with Brockville’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Plant out after about 27 April; the first frost of autumn usually arrives near 14 October, leaving roughly 169 days without frost.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark May, Jun, Jul, Aug and Sep.
Parks & trails →For the weather that does damage, from ice storms to floods, see Brockville’s hazards page.
Flood & hazards →ECCC’s normals location: Brockville
ECCC builds the Brockville normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 6.0 km north-west |
| Station altitude | 120 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −31.5°C |
| Hottest reading, 1991–2020 | 35.0°C |
| Next-nearest location | Kemptville, 45 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 Ontario.
Nearby towns’ climate
Places around Brockville whose figures come from another normals location. Distances here run 32–44 km: that is how far the nearest places with figures are from Brockville.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Brockville | 26.1°C | −11.3°C | 1,017 mm |
| Cardinal 32 km · Kemptville | 26.8°C 0.7°C warmer | −14.0°C 2.7°C colder | 925 mm |
| Smiths Falls 42 km · Drummond Centre | 27.1°C 1.0°C warmer | −14.2°C 2.9°C colder | 939 mm |
Brockville weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −3.1°C | −11.3°C | −7.2°C | 84 mm | 50 cm |
| February | −1.7°C | −10.3°C | −6.0°C | 64 mm | 41 cm |
| March | 3.7°C | −5.0°C | −0.7°C | 68 mm | 29 cm |
| April | 11.3°C | 1.8°C | 6.6°C | 89 mm | 8 cm |
| May | 18.8°C | 8.3°C | 13.5°C | 80 mm | under 1 cm |
| June | 23.4°C | 13.5°C | 18.5°C | 96 mm | 0 cm |
| July | 26.1°C | 16.5°C | 21.3°C | 99 mm | 0 cm |
| August | 25.4°C | 15.7°C | 20.6°C | 82 mm | 0 cm |
| September | 21.2°C | 11.7°C | 16.5°C | 96 mm | 0 cm |
| October | 13.8°C | 5.8°C | 9.7°C | 94 mm | 1 cm |
| November | 7.0°C | −0.2°C | 3.5°C | 81 mm | 11 cm |
| December | 0.4°C | −6.5°C | −3.0°C | 85 mm | 41 cm |
| Year | 12.2°C | 3.3°C | 7.8°C | 1,017 mm | 180 cm |
January varies most from one year to the next (3.1°C), June least
March has the widest record range, −26.0°C in 2003 to 26.0°C in 1998; the tick on each bar is the month’s normal.
Where Brockville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Brockville, the nearest location with a full year of temperatures.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: sunshine, not in ECCC’s 1991–2020 normals, and the effect of the town’s height, for which there is no figure.
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?
Highs reach 26.1°C on an average July day; no month is warmer.
How cold does Brockville get in winter?
January nights average −11.3°C, the coldest of the year.
How much rain and snow does Brockville get?
A normal year brings 1,017 mm, snow included as water: July is wettest at 99 mm, February driest at 64 mm.
Are these figures for Brockville itself?
Close to it: they are ECCC’s 1991–2020 normals for Brockville, just outside Brockville’s boundary.
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).