Photo: Larry from Charlottetown, PEI, Canada · CC BY 2.0The climate in O'Leary sits close to the middle of Canadian towns
About 1,002 mm of rain and snow falls in a typical year; July afternoons reach 24.1°C and January nights drop to −11.3°C. Its July afternoons stay fresher than in 70% of Canadian towns. Precipitation peaks in October and eases off in February. Wet days, with 1 mm of rain or snow or more, come about 120 times a year.
O'Leary has no ECCC normals station of its own: every figure here comes from Summerside, 42 km south-east.
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.
153 frost days and 87 days above 20°C a year
Frost comes from October to May; in January almost every night freezes. Some 6 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
About 1,002 mm of rain and snow a year
12th wettest of 13 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, 52 km away.
Snowfall: about 292 cm in a normal year
From November to May snow is likely; January is the peak, at about 67 cm. 2nd snowiest of 13 towns of 2,500+ on Prince Edward Island.
Snowfall by month
Centimetres
ECCC’s Summerside normals leave snowfall out; the figures here come from New Glasgow, 75 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.
One degree below 18°C for one day makes one heating degree day; the year’s days are added together.
Living with O'Leary’s climate
What the normals mean for a garden, a day outside and the depth of winter.
For long days outdoors, Jun, Jul, Aug and Sep bring highs of 17–27°C and lows of 8°C or more.
Parks & trails →On some 29 days a year the wind chill drops past −20; mitts and a scarf earn their place.
On some 28 days a year the humidex climbs past 30.
The normals describe a typical year, not its worst days; the hazards page covers O'Leary’s.
Flood & hazards →ECCC’s normals location: Summerside
ECCC builds the Summerside normals from 2 stations’ records over 1991–2020, joined where one replaced another.
| Distance from the town | 42 km south-east |
| Station altitude | 12 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Precipitation from | Bouctouche, 52 km |
| Snowfall from | New Glasgow, 75 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, 43 km |
How O'Leary compares
Placed among 2,611 Canadian towns and neighbourhoods of 2,500+, each on its nearest normals location; each dot is another location used on Prince Edward Island.
Nearby towns’ climate
The nearest places on a normals location of their own: those that share O'Leary’s would only repeat its figures.
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 |
Two years in three, February’s average lands within 2.1°C of normal, against the steadier July
Each bar spans a month’s coldest and warmest readings over thirty years; March’s run from −23.0°C in 2008 to 25.2°C in 2012.
Where O'Leary’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the 1991–2020 normals from ECCC for Summerside, its nearest location with complete temperatures.
- Other locations: precipitation and snowfall come from the nearest location that publishes all twelve months of them, as named above.
- Comparisons: a pool of Canadian towns and neighbourhoods of 2,500 or more, read alike; whole cities and reserves stay out of it.
- 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?
In July, the warmest month, the typical high is 24.1°C.
How cold does O'Leary get in winter?
The year’s coldest nights belong to January, at about −11.3°C.
How much rain and snow does O'Leary get?
A normal year brings 1,002 mm, snow included as water: October is wettest at 106 mm, February driest at 59 mm.
Are these figures for O'Leary itself?
They describe Summerside, the nearest normals location, rather than O'Leary itself.
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).