Photo: Amakuha · CC BY 4.0A middle-of-the-road climate: Marmora is close to most Canadian towns on every count
A typical year brings 941 mm of rain and melted snow, with July afternoons around 26.5°C and January nights around −11.2°C. Only about 146 nights a year bring a frost, fewer than in 68% of Canadian towns. The wettest month is September; the driest is February. Frost comes on about 146 days a year, so leave time to clear the car.
The nearest ECCC normals location to Marmora is Trenton, 43 km south, and every figure on this page is its.
A year in Marmora at a glance
Each month’s typical high and low, in °C.
What stands out about Marmora’s climate
Compared with Canadian towns, with its place among towns of 2,500+ in Ontario beside it.
What a year in Marmora feels like
Each season’s and each month’s usual high and low, 1991–2020.
146 frost days and 124 days above 20°C a year
From October to May frost is routine, and in January it comes on almost every night. On about 9 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 941 mm of rain and snow a year
About 116 days a year bring 1 mm or more.
Rain and snow by month
Millimetres
Rain alone by month
Millimetres
155 cm of snow in a typical year
Expect snow from November to April, with about 44 cm in January, the snowiest month.
Snowfall by month
Centimetres
Snow on the ground by month
Centimetres at month’s end
Heating a home in Marmora
92% of a year’s heating need falls between October and April. Months averaging under 10°C: October to April.
Each day the mean sits under 18°C adds its shortfall; a year’s total is its heating degree days. Homes here need less heating than 70% of Canadian towns.
Living with Marmora’s climate
What the normals mean for a garden, a day outside and the depth of winter.
About 161 days a year pass without frost, from an average last frost of 1 May to a first of 10 October.
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 28 days a year the wind chill drops past −20; mitts and a scarf earn their place.
Expect around 51 sticky days a year with the humidex above 30.
The normals describe a typical year, not its worst days; the hazards page covers Marmora’s.
Flood & hazards →ECCC’s normals location: Trenton
Trenton is one of the 450 places where ECCC publishes 1991–2020 normals.
| Distance from the town | 43 km south |
| Station altitude | 86 m |
| Completeness | meets the WMO “3 and 5” rule |
| WMO standard normals | Yes |
| Coldest reading, 1991–2020 | −35.1°C |
| Hottest reading, 1991–2020 | 35.6°C |
| Average wind | 12.7 km/h on average, most often from the south-west |
| Next-nearest location | Peterborough, 61 km |
How Marmora 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 Marmora’s would only repeat its figures. No closer places have figures: these lie 19–44 km from Marmora.
| Town | July high | January low | Rain & snow |
|---|---|---|---|
| Marmora Trenton | 26.5°C | −11.2°C | 941 mm |
| Madoc 19 km · Centreville | 27.2°C 0.7°C warmer | −12.4°C 1.2°C colder | 984 mm |
| Norwood 27 km · Peterborough | 26.6°C about the same | −12.8°C 1.6°C colder | 840 mm |
| North Kawartha 44 km · Haliburton | 25.3°C 1.2°C cooler | −16.0°C 4.8°C colder | 1,106 mm |
Marmora weather by month
Each month’s normals, 1991–2020: high, low, mean, precipitation and snowfall.
| Month | High | Low | Mean | Rain & snow | Snow |
|---|---|---|---|---|---|
| January | −1.6°C | −11.2°C | −6.4°C | 78 mm | 44 cm |
| February | −0.7°C | −10.6°C | −5.7°C | 60 mm | 39 cm |
| March | 4.4°C | −5.5°C | −0.6°C | 64 mm | 22 cm |
| April | 11.6°C | 0.9°C | 6.3°C | 84 mm | 6 cm |
| May | 18.9°C | 7.3°C | 13.1°C | 81 mm | 0 cm |
| June | 23.9°C | 12.7°C | 18.3°C | 83 mm | 0 cm |
| July | 26.5°C | 15.4°C | 21.0°C | 75 mm | 0 cm |
| August | 25.6°C | 14.4°C | 20.0°C | 70 mm | 0 cm |
| September | 21.6°C | 10.1°C | 15.8°C | 92 mm | 0 cm |
| October | 14.2°C | 4.2°C | 9.2°C | 91 mm | 1 cm |
| November | 7.4°C | −1.5°C | 3.0°C | 84 mm | 10 cm |
| December | 1.4°C | −6.9°C | −2.8°C | 77 mm | 33 cm |
| Year | 12.8°C | 2.4°C | 7.6°C | 941 mm | 155 cm |
From −25.6°C to 25.4°C: March’s coldest and warmest days since 1991
The month to count on least is January: one year in three its average strays more than 3.0°C from −6.4°C. June moves least, typically by 1.1°C.
Where Marmora’s numbers come from
Averages over 30 years, not a forecast.
- Normals: ECCC’s normals for Trenton, 1991–2020, chosen as the nearest location with a full temperature record.
- 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 Marmora’s climate
How warm does Marmora get in summer?
At its warmest, in July, the normal high is 26.5°C.
How cold does Marmora get in winter?
On a normal January night the air drops to −11.2°C, the coldest of the year.
How much rain and snow does Marmora get?
Some 941 mm falls in a year. Most of it comes in September (92 mm), the least in February (60 mm).
How long does snow stay on the ground?
Around 75 days a year see 1 cm of snow or more lying.
Are these figures for Marmora itself?
Not quite: they come from Trenton, the closest ECCC normals location to Marmora.
Data Source: Environment and Climate Change Canada · ECCC Data Services End-use Licence Today’s forecast for Marmora →
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).