Photo: Earth Science and Remote Sensing Unit , Lyndon B. Johnson Space Center · Public domainWeather without surprises: O'Leary keeps close to the norm for Canadian towns
A typical year brings 1,002 mm of rain and melted snow, with July afternoons around 24.1°C and January nights around −11.3°C. By July afternoons alone, it runs cooler than 70% of Canadian towns. A year here swings 35°C from midwinter lows to midsummer highs. About 120 days a year bring 1 mm of precipitation or more.
The nearest ECCC normals location to O'Leary is Summerside, 41 km south-east, and every figure on this page is its.
A year in O'Leary at a glance
Each month’s typical high and low, in °C.
What stands out about O'Leary’s climate
Compared with Canadian towns, with its place among towns of 2,500+ on Prince Edward Island beside it.
What a year in O'Leary feels like
Seasons and months as ECCC’s 1991–2020 normals give them: a typical day’s high and low.
Frost on 153 days, 20°C on 87
Frost comes from October to May; in January almost every night freezes. On about 6 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
1,002 mm of precipitation in a typical year
October is the wettest month and February the driest. 12th wettest of 12 towns of 2,500+ on Prince Edward Island.
Rain and snow by month
Millimetres
ECCC’s Summerside normals leave precipitation out; the figures here come from Bouctouche, 53 km away.
292 cm of snow in a typical year
Snow falls from November to May, most of all in January (about 67 cm). 2nd snowiest of 12 towns of 2,500+ on Prince Edward Island.
Snowfall by month
Centimetres
Summerside publishes no full year of snowfall, so these figures come from New Glasgow, 73 km away.
Heating a home in O'Leary
89% of a year’s heating need falls between October and April. Months averaging under 10°C: October to May.
Behind the figure: the degrees each day’s mean falls under 18°C, summed for the year.
Living with O'Leary’s climate
What the normals mean for a garden, a day outside and the depth of winter.
Warm afternoons without cold nights, 17–27°C and 8°C or more, mark Jun, Jul, Aug and Sep.
Parks & trails →On some 29 days a year the wind chill drops past −20; mitts and a scarf earn their place.
Count on some 28 humid days a year with the humidex past 30.
A normal year has no blizzard, flood or heat wave in it; O'Leary’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: Summerside
Behind the 1991–2020 normals for Summerside are 2 stations, which ECCC combines into one record.
| Distance from the town | 41 km south-east |
| Station altitude | 12 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Bouctouche, 53 km |
| Snowfall from | New Glasgow, 73 km |
| Coldest reading, 1991–2020 | −28.0°C |
| Hottest reading, 1991–2020 | 33.7°C |
| Average wind | 18.8 km/h on average, most often from the south |
| Next-nearest location | North Cape, 42 km |
How O'Leary 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 on Prince Edward Island.
Nearby towns’ climate
Places around O'Leary whose figures come from another normals location.
O'Leary weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −2.9°C | −11.3°C | −7.1°C | 72 mm | 67 cm |
| February | −2.6°C | −11.3°C | −7.0°C | 59 mm | 65 cm |
| March | 1.2°C | −6.6°C | −2.7°C | 79 mm | 50 cm |
| April | 7.3°C | −0.8°C | 3.3°C | 69 mm | 24 cm |
| May | 14.3°C | 4.9°C | 9.6°C | 93 mm | 2 cm |
| June | 19.7°C | 10.4°C | 15.1°C | 82 mm | 0 cm |
| July | 24.1°C | 15.0°C | 19.6°C | 89 mm | 0 cm |
| August | 23.8°C | 14.5°C | 19.2°C | 74 mm | 0 cm |
| September | 19.4°C | 10.4°C | 14.9°C | 101 mm | 0 cm |
| October | 13.0°C | 5.2°C | 9.1°C | 106 mm | 1 cm |
| November | 6.7°C | −0.1°C | 3.3°C | 92 mm | 19 cm |
| December | 0.9°C | −6.0°C | −2.5°C | 86 mm | 66 cm |
| Year | 10.4°C | 2.0°C | 6.2°C | 1,002 mm | 292 cm |
March has run from −23.0°C to 25.2°C in thirty years
From one year to the next, February’s average typically shifts by 2.1°C around its normal of −7.0°C, the widest of any month, while July’s shifts by 0.8°C.
Where O'Leary’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 Canadian Climate Normals at Summerside, the closest ECCC location with twelve months of temperature normals.
- Other locations: precipitation and snowfall come from the nearest location that publishes all twelve months of them, as named above.
- 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: 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 O'Leary’s climate
How warm does O'Leary get in summer?
Expect highs near 24.1°C in July, the hottest month on average.
How cold does O'Leary get in winter?
Midwinter means January, when a typical night reaches −11.3°C.
How much rain and snow does O'Leary get?
Measured as water, a year brings 1,002 mm: 106 mm in October, the wettest month, and 59 mm in February, the driest.
Are these figures for O'Leary itself?
Only indirectly: the readings are made at Summerside, outside O'Leary.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for O'Leary →
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).