Chapman Mills has warmer summer afternoons than 86% of Canadian towns
The depth of winter brings overnight lows near −14.3°C. Temperatures cover 41°C across the year, low to high. Its January nights bite harder than in 61% of Canadian towns. Picnics, hikes and garden evenings come into their own from June to September, with highs of 21–27°C.
Figures: ECCC’s 1991–2020 normals for Ottawa (Airport) (7.2 km north-east).
A year in Chapman Mills at a glance
Each month’s typical high and low, in °C.
What stands out about Chapman Mills’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Chapman Mills feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 154 days, 20°C on 120
From October to April frost is routine, and in January it comes on almost every night. On about 16 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 930 mm of rain and snow a year
June is the wettest month and February the driest. About 118 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
Snowfall: about 232 cm in a normal year
The snow season runs October to April; January brings the most, about 59 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Chapman Mills
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Measured against 18°C: each day’s shortfall in mean temperature, added over twelve months.
Living with Chapman Mills’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
Tender plants are usually safe from around 29 April until frost returns near 7 October: about 160 days.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →Winter brings about 47 days with a wind chill below −20.
About 49 days a year turn sultry, with the humidex past 30.
The normals describe a typical year, not its worst days; the hazards page covers Chapman Mills’s.
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 | 7.2 km north-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), 12 km |
How Chapman Mills compares
Compared with 2,611 towns and neighbourhoods of 2,500 or more across Canada; the dots mark the other normals locations in Ontario.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share Chapman Mills’s would only repeat its figures. Distances here run 10–32 km: that is how far the nearest places with figures are from Chapman Mills.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Chapman Mills Ottawa (Airport) | 27.0°C | −14.3°C | 930 mm |
| Ottawa 10 km · Ottawa (City) | 26.7°C about the same | −14.0°C about the same | 938 mm |
| Chelsea 31 km · Luskville | 26.9°C about the same | −16.0°C 1.7°C colder | 968 mm |
| Kemptville 31 km · Kemptville | 26.8°C about the same | −14.0°C about the same | 925 mm |
| Cantley 32 km · Angers | 26.2°C 0.8°C cooler | −16.5°C 2.2°C colder | 938 mm |
Chapman Mills 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 | −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 |
March: −29.0°C at its coldest, 27.4°C at its warmest
From one year to the next, January’s average typically shifts by 3.2°C around its normal of −10.0°C, the widest of any month, while August’s shifts by 1.1°C.
Where Chapman Mills’s numbers come from
Averages over 30 years, not a forecast.
- Normals: 1991–2020 normals for Ottawa (Airport) from ECCC’s climate data site, the nearest location with every month of temperature.
- Comparisons: all Canadian places of 2,500 or more except city totals and reserves, each read the same way.
- Not on this page: sunshine, which none of ECCC’s 450 locations publishes for 1991–2020, and the town’s own height above sea level, so no figure is adjusted for altitude.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Chapman Mills’s climate
How warm does Chapman Mills get in summer?
At its warmest, in July, the normal high is 27.0°C.
How cold does Chapman Mills get in winter?
On a normal January night the air drops to −14.3°C, the coldest of the year.
How much rain and snow does Chapman Mills get?
Measured as water, a year brings 930 mm: 97 mm in June, the wettest month, and 50 mm in February, the driest.
How long does snow stay on the ground?
About 118 days a year count as snow-covered, with 1 cm or more.
Are these figures for Chapman Mills itself?
Close to it: they are ECCC’s 1991–2020 normals for Ottawa (Airport), just outside Chapman Mills’s boundary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Chapman Mills →
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).