July in Stittsville runs hotter than in 86% of Canadian towns
The coldest hours of a January night bottom out at −14.3°C on average. Winter nights are cold: in January they are colder than in 61% of Canadian towns. Some 41°C separates winter nights from summer afternoons. The heating season runs October to April: each of those months averages under 10°C.
Read at Ottawa (Airport), 20 km east: ECCC’s normals for 1991–2020.
A year in Stittsville at a glance
Each month’s typical high and low, in °C.
What stands out about Stittsville’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Stittsville feels like
Typical highs and lows by season and by month, from ECCC’s 1991–2020 normals.
About 154 frosts and 120 warm days a year
From October to April frost is routine, and in January it comes on almost every night. Some 16 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
930 mm of precipitation in a typical year
June brings the most rain and snow; February, the least. About 118 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
232 cm of snow in a typical year
Snow falls from October to April, most of all in January (about 59 cm).
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Stittsville
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Heating degree days total each day’s gap between its mean temperature and 18°C.
Living with Stittsville’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Plant out after about 29 April; the first frost of autumn usually arrives near 7 October, leaving roughly 160 days without frost.
Plan time outside for Jun, Jul, Aug and Sep: highs of 17–27°C and nights no colder than 8°C.
Parks & trails →About 47 days a year bring a wind chill under −20, when bare skin chills fast.
On some 49 days a year the humidex climbs past 30.
Storms, floods and heat waves sit outside these normals; Stittsville’s hazards page covers them.
Flood & hazards →ECCC’s normals location: Ottawa (Airport)
Ottawa (Airport) is a composite: ECCC joins 2 stations’ readings to make its 1991–2020 normals.
| Distance from the town | 20 km east |
| Station altitude | 114 m |
| Completeness | at least 25 years |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −33.1°C |
| Hottest reading, 1991–2020 | 36.9°C |
| Average wind | 13.5 km/h on average, most often from the west |
| Next-nearest location | Ottawa (City), 21 km |
How Stittsville 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 Stittsville’s own would show the same figures).
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Stittsville Ottawa (Airport) | 27.0°C | −14.3°C | 930 mm |
| Stittsville North 2.5 km · Ottawa (City) | 26.7°C about the same | −14.0°C about the same | 938 mm |
Stittsville 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 | −5.5°C | −14.3°C | −10.0°C | 70 mm | 59 cm |
| February | −3.6°C | −13.2°C | −8.5°C | 50 mm | 49 cm |
| March | 2.4°C | −7.1°C | −2.4°C | 66 mm | 39 cm |
| April | 11.3°C | 0.5°C | 5.9°C | 81 mm | 12 cm |
| May | 19.6°C | 7.5°C | 13.6°C | 75 mm | under 1 cm |
| June | 24.4°C | 12.9°C | 18.7°C | 97 mm | 0 cm |
| July | 27.0°C | 15.4°C | 21.2°C | 89 mm | 0 cm |
| August | 25.8°C | 14.3°C | 20.1°C | 79 mm | 0 cm |
| September | 21.0°C | 9.6°C | 15.3°C | 90 mm | 0 cm |
| October | 13.0°C | 3.4°C | 8.2°C | 87 mm | 3 cm |
| November | 5.8°C | −2.4°C | 1.7°C | 74 mm | 21 cm |
| December | −1.9°C | −9.6°C | −5.8°C | 72 mm | 50 cm |
| Year | 11.6°C | 1.4°C | 6.5°C | 930 mm | 232 cm |
Two years in three, January’s average lands within 3.2°C of normal, against the steadier August
Bars run from each month’s record low to its record high since 1991. March spans the most, from −29.0°C (2003) to 27.4°C (2012).
Where Stittsville’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Ottawa (Airport), its nearest location with complete 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: 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 Stittsville’s climate
How warm does Stittsville get in summer?
A normal July afternoon tops out at about 27.0°C, the year’s high point.
How cold does Stittsville get in winter?
Winter bottoms out in January, with lows near −14.3°C.
How much rain and snow does Stittsville get?
Over twelve months, rain and melted snow come to 930 mm; the range runs from 50 mm in February to 97 mm in June.
How long does snow stay on the ground?
Snow covers the ground, 1 cm or more, on about 118 days a year.
Are these figures for Stittsville itself?
Nearly: Ottawa (Airport), the location behind them, sits just beyond Stittsville’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Stittsville →
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).