July in Greely runs hotter than in 86% of Canadian towns
Nights in January average −14.3°C. Precipitation peaks in June and eases off in February. In January, nights here are colder than in 61% of Canadian towns. Heating does most of its work from October to April, in months below 10°C on average.
1991–2020 normals from ECCC’s Ottawa (Airport) location, 9.7 km north-west.
A year in Greely at a glance
Each month’s typical high and low, in °C.
What stands out about Greely’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Greely feels like
Each season’s and each month’s usual high and low, 1991–2020.
154 frost days and 120 days above 20°C a year
Frost comes from October to April; in January almost every night freezes. 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
On about 118 days a year, 1 mm or more falls.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
232 cm of snow in a typical 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 Greely
93% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
A heating degree day is one degree of shortfall below 18°C for one day, summed over the year.
Living with Greely’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.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →Count on some 47 days a year when the wind makes it feel below −20.
Summer brings about 49 days when the humidex passes 30.
Storms, floods and heat waves sit outside these normals; Greely’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 | 9.7 km north-west |
| 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), 17 km |
How Greely 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
Places around Greely whose figures come from another normals location. No closer places have figures: these lie 15–29 km from Greely.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Greely Ottawa (Airport) | 27.0°C | −14.3°C | 930 mm |
| Ottawa 15 km · Ottawa (City) | 26.7°C about the same | −14.0°C about the same | 938 mm |
| Winchester 26 km · Kemptville | 26.8°C about the same | −14.0°C about the same | 925 mm |
Greely weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and 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
March has the widest record range, −29.0°C in 2003 to 27.4°C in 2012; the tick on each bar is the month’s normal.
Where Greely’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: Canada’s towns and neighbourhoods of 2,500+ (no city totals, no reserves), each through its own nearest location.
- 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 Greely’s climate
How warm does Greely get in summer?
Of all twelve months, July has the warmest afternoons, about 27.0°C.
How cold does Greely get in winter?
Winter bottoms out in January, with lows near −14.3°C.
How much rain and snow does Greely get?
Some 930 mm falls in a year. Most of it comes in June (97 mm), the least in February (50 mm).
How long does snow stay on the ground?
A layer of at least 1 cm stays down on about 118 days a year.
Are these figures for Greely itself?
Almost: ECCC’s Ottawa (Airport) location, which gives these figures, lies a short way outside Greely.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Greely →
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).