St. Thomas Weather in December
St. Thomas in December
The short of it: St. Thomas in December averages a high of 2 °C (35 °F) and a low of -4 °C (24 °F), with 83 mm (3.3 in) of rain and about 9 h 3 min of daylight. Rated 1 of 5 for a visit; the best months are September and June. Source: TerraClimate climate normals, 1991–2020.
Average high 2° · low -4° · rain 83 mm · daylight 9 h 3 min
✦ Travel with care for a visit · best months: September & June
Thirty years of records give St. Thomas an average December high of 2°, a low of -4° and some 83 mm of rain. Highs fall 6° against November, to near 2°; nights run about -4°. Wet spells are common — about 83 mm, the 6th wettest month. The first lasting snow usually comes now.
The sun is up for about 9 h 3 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 1 of 5 for a visit; the finest months here are September and June.
Against its neighbours, St. Thomas runs warmer than most and wetter than most in December. Aylmer, 16 km to the E, sees much the same highs.
December in St. Thomas, by the numbers
- Warmth rank
- 10th warmest of 12
- Rain rank
- 6th wettest of 12
- Versus November
- 6° colder, 4.0 mm less rain
- Versus January
- 3° warmer
- Day–night spread
- 6°
- Snow season
- Dec–Mar
- Daylight, mid-month
- 9 h 3 min
- Average wind
- 16 km/h
Neighbouring Towns
December averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| AylmerOntario | 16 km E | 2° | -4° | 83 mm |
| LondonOntario | 24 km N | 2° | -4° | 85 mm |
| DorchesterOntario | 25 km NNE | 1° | -5° | 83 mm |
| IngersollOntario | 38 km NE | 1° | -5° | 80 mm |
| TillsonburgOntario | 38 km ENE | 2° | -5° | 83 mm |
| StrathroyOntario | 41 km WNW | 2° | -4° | 83 mm |
| St. MarysOntario | 53 km N | 1° | -5° | 94 mm |
| WoodstockOntario | 53 km NE | 1° | -5° | 75 mm |