Sarnia Weather in December
Sarnia in December
The short of it: Sarnia in December averages a high of 3 °C (37 °F) and a low of -4 °C (25 °F), with 60 mm (2.4 in) of rain and about 9 h 1 min of daylight. Rated 2 of 5 for a visit; the best months are July and September. Source: TerraClimate climate normals, 1991–2020.
Average high 3° · low -4° · rain 60 mm · daylight 9 h 1 min
✦✦ Travel with care for a visit · best months: July & September
Thirty years of records give Sarnia an average December high of 3°, a low of -4° and some 60 mm of rain. Highs fall 6° against November, to near 3°; nights run about -4°. Wet spells are common — about 60 mm, the 9th wettest month. The first lasting snow usually comes now.
The sun is up for about 9 h 1 min in mid-December, 38 minutes less than a month before.
For the traveller: pack a heavy coat, gloves and a scarf, and an oilskin besides. The Almanac rates December 2 of 5 for a visit; the finest months here are July and September.
Against its neighbours, Sarnia runs warmer than most and wetter than most in December. Port Huron, 2 km to the WSW, sees much the same highs.
December in Sarnia, by the numbers
- Warmth rank
- 10th warmest of 12
- Rain rank
- 9th wettest of 12
- Versus November
- 6° colder, 12 mm less rain
- Versus January
- 3° warmer
- Day–night spread
- 6°
- Snow season
- Dec–Mar
- Daylight, mid-month
- 9 h 1 min
- Average wind
- 17 km/h
Neighbouring Towns
December averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| Port HuronMichigan | 2 km WSW | 3° | -4° | 60 mm |
| MarysvilleMichigan | 10 km SW | 2° | -4° | 59 mm |
| CorunnaOntario | 11 km SSW | 3° | -4° | 60 mm |
| Saint ClairMichigan | 19 km SSW | 3° | -4° | 59 mm |
| CamlachieOntario | 21 km ENE | 2° | -4° | 68 mm |
| PetroliaOntario | 23 km ESE | 2° | -4° | 69 mm |
| RichmondMichigan | 34 km WSW | 2° | -4° | 57 mm |
| New BaltimoreMichigan | 43 km SW | 2° | -4° | 59 mm |