Afternoon heat in Overbrook beats that of 78% of Canadian towns
On a normal January night the air cools to about −14.0°C. Rain or snow is most frequent in June and least in February. It is a wet place: more rain and snow fall here than on 60% of Canadian towns. Expect about 147 frosty starts a year, days when the air falls to freezing.
Environment and Climate Change Canada’s 1991–2020 normals at its Ottawa (City) station, 8.1 km south-west.
A year in Overbrook at a glance
Each month’s typical high and low, in °C.
What stands out about Overbrook’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Overbrook feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
Frost on 147 days, 20°C on 121
From October to April frost is routine, and in January it comes on almost every night. On about 15 nights a year the air falls below −20°C.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
About 938 mm of rain and snow a year
Some 120 days a year see 1 mm of rain or snow or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 185 cm in a normal year
From October to April snow is likely; January is the peak, at about 45 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Overbrook
93% 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 Overbrook’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The growing season between frosts lasts about 158 days, roughly 30 April to 6 October.
Mild days and mild nights together (17–27°C by day, 8°C or more at night) belong to May, Jun, Jul, Aug and Sep.
Parks & trails →The wind chill passes −20 on about 39 days in a normal year.
Humid summer days, the humidex above 30, number about 50 a year.
Storms, floods and heat waves sit outside these normals; Overbrook’s hazards page covers them.
Flood & hazards →ECCC’s normals location: Ottawa (City)
Ottawa (City) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 8.1 km south-west |
| Station altitude | 79 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −32.2°C |
| Hottest reading, 1991–2020 | 37.3°C |
| Average wind | 11.5 km/h on average, most often from the west |
| Next-nearest location | Ottawa (Airport), 12 km |
How Overbrook 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
Places around Overbrook whose figures come from another normals location. No closer places have figures: these lie 17–29 km from Overbrook.
Overbrook weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −5.2°C | −14.0°C | −9.6°C | 65 mm | 45 cm |
| February | −3.3°C | −12.9°C | −8.1°C | 52 mm | 41 cm |
| March | 2.5°C | −6.9°C | −2.2°C | 62 mm | 31 cm |
| April | 11.2°C | 1.1°C | 6.2°C | 81 mm | 8 cm |
| May | 19.4°C | 8.0°C | 13.8°C | 80 mm | 0 cm |
| June | 24.2°C | 13.3°C | 18.8°C | 95 mm | 0 cm |
| July | 26.7°C | 15.8°C | 21.3°C | 92 mm | 0 cm |
| August | 25.6°C | 14.6°C | 20.1°C | 87 mm | 0 cm |
| September | 21.1°C | 10.1°C | 15.6°C | 87 mm | 0 cm |
| October | 13.3°C | 4.1°C | 8.8°C | 90 mm | 2 cm |
| November | 5.8°C | −1.8°C | 2.0°C | 72 mm | 16 cm |
| December | −1.5°C | −8.7°C | −5.1°C | 74 mm | 43 cm |
| Year | 11.7°C | 1.9°C | 6.8°C | 938 mm | 185 cm |
A January here can run warm or cold, its average moving by about 3.1°C; the steadiest month is June
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −28.5°C in 2003 to 26.5°C in 2012.
Where Overbrook’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s 1991–2020 Canadian Climate Normals for Ottawa (City), the nearest location with a full year of temperatures.
- Comparisons: the 2,500-plus towns and neighbourhoods of Canada, each read from its closest normals location; whole cities and reserves aren’t counted.
- 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 Overbrook’s climate
How warm does Overbrook get in summer?
Afternoons average 26.7°C in July, the warmest time of year.
How cold does Overbrook get in winter?
Expect nights around −14.0°C in January; no month is colder.
How much rain and snow does Overbrook get?
938 mm a year counting snow as water. The wettest month is June (95 mm); the driest, February (52 mm).
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 115 days a year.
Are these figures for Overbrook itself?
They are the normals for Ottawa (City), measured just outside Overbrook itself.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Overbrook →
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).