July in Greater Napanee runs hotter than in 89% of Canadian towns
The depth of winter brings overnight lows near −12.4°C. It is a wet place: more rain and snow fall here than on 67% of Canadian towns. September is the wettest month, February the driest. Picnics, hikes and garden evenings suit June, August and September, with highs of 22–26°C.
Greater Napanee has no ECCC normals station of its own: every figure here comes from Centreville, 19 km north.
A year in Greater Napanee at a glance
Each month’s typical high and low, in °C.
What stands out about Greater Napanee’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Greater Napanee 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 124
The frost season runs October to May, and January freezes nearly every night. Deep cold, under −20°C, comes on about 13 nights a year.
Frost days by month
Average days at 0°C or below
Days above 20°C by month
Average days
Rain and melted snow: about 984 mm a year
About 128 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
About 158 cm of snow a year
From October to April snow is likely; January is the peak, at about 45 cm.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Greater Napanee
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. That means homes here need less heating than 67% of Canadian towns.
Living with Greater Napanee’s climate
The averages read for the garden, the outdoors and the coldest and hottest days.
The outdoor season by the averages is Jun, Aug and Sep, with highs of 17–27°C and lows of 8°C or more.
Parks & trails →A normal year has no blizzard, flood or heat wave in it; Greater Napanee’s hazards page looks at those.
Flood & hazards →ECCC’s normals location: Centreville
Centreville is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 19 km north |
| Station altitude | 150 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | No |
| Coldest reading, 1991–2020 | −37.0°C |
| Hottest reading, 1991–2020 | 37.5°C |
| Next-nearest location | Kingston, 30 km |
How Greater Napanee 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
Places around Greater Napanee whose figures come from another normals location. The nearest places to Greater Napanee with figures are 16–36 km away.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Greater Napanee Centreville | 27.2°C | −12.4°C | 984 mm |
| Tyendinaga Mohawk Territory 16 km · Trenton | 26.5°C 0.7°C cooler | −11.2°C 1.2°C milder | 941 mm |
| Loyalist 23 km · Kingston | 25.4°C 1.8°C cooler | −11.5°C 0.9°C milder | 984 mm |
Greater Napanee 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 | −2.9°C | −12.4°C | −7.7°C | 86 mm | 45 cm |
| February | −1.4°C | −11.6°C | −6.5°C | 61 mm | 34 cm |
| March | 4.1°C | −6.3°C | −1.4°C | 65 mm | 24 cm |
| April | 11.9°C | 0.8°C | 6.3°C | 88 mm | 7 cm |
| May | 19.6°C | 7.2°C | 13.4°C | 84 mm | under 1 cm |
| June | 24.4°C | 12.2°C | 18.4°C | 90 mm | 0 cm |
| July | 27.2°C | 14.9°C | 21.1°C | 68 mm | 0 cm |
| August | 26.2°C | 13.9°C | 20.1°C | 75 mm | 0 cm |
| September | 21.9°C | 9.9°C | 15.9°C | 100 mm | 0 cm |
| October | 14.1°C | 3.9°C | 9.0°C | 96 mm | 1 cm |
| November | 6.9°C | −1.7°C | 2.6°C | 88 mm | 12 cm |
| December | 0.4°C | −7.5°C | −3.6°C | 83 mm | 35 cm |
| Year | 12.7°C | 1.9°C | 7.3°C | 984 mm | 158 cm |
The month with the widest range: March, −28.0°C to 27.5°C
January is the least predictable month: about two years in three its average lands within 3.1°C of the normal, −7.7°C. June is the steadiest, within 1.1°C.
Where Greater Napanee’s numbers come from
Averages over 30 years, not a forecast.
- Normals: the Canadian Climate Normals, 1991–2020, at Centreville (the closest location with all twelve months of temperatures).
- Comparisons: every Canadian town and neighbourhood of 2,500 or more, each read from its own nearest location; city totals and reserves are left out.
- Not on this page: sunshine, absent from every 1991–2020 location, and an altitude correction, for want of the town’s own elevation.
Canadian Climate Normals 1991–2020 · ECCC Data Services End-use Licence. Data Source: Environment and Climate Change Canada
Questions about Greater Napanee’s climate
How warm does Greater Napanee get in summer?
At its warmest, in July, the normal high is 27.2°C.
How cold does Greater Napanee get in winter?
The coldest nights come in January, averaging −12.4°C.
How much rain and snow does Greater Napanee get?
Count on roughly 984 mm a year, heaviest in September (100 mm) and lightest in February (61 mm).
Are these figures for Greater Napanee itself?
Not directly: Greater Napanee has no ECCC normals of its own, and Centreville stands in for it.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Greater Napanee →
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).