Saint-Hyacinthe weather in December

In December, Saint-Hyacinthe sees average daytime highs of -2°C and overnight lows near -9°C, with 86 mm of precipitation across 11.9 wet days and about 8.6 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 1°C in the first days to -4°C by the end. The sky is clear or mostly clear about 18% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 48 min at the start of December to 8 h 30 min by month's end. Set against the rest of the year, December is Saint-Hyacinthe's 12th-clearest and 7th-windiest month. For the whole year in context, see Saint-Hyacinthe's year-round climate.

Daytime high
-2°
10th warmest
Overnight low
-9°
3rd coldest
Precipitation
86 mm
11.9 wet days
Daylight
8 h 30 min
7:33 AM – 4:03 PM
Cloud cover
71%
12th clearest
Wind
12 km/h
7th windiest
Solar energy
1.25 kWh/m²
Travel score
0.0
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 1°C in the first days to -4°C by the end.

A typical December day in Saint-Hyacinthe reaches about -2°C in the afternoon and slips back to -9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between -10°C and 5°C. Set against its neighbours, December runs about 7°C cooler than November and about 4°C warmer than January.

-20°-10°10°151015202531
Avg high (°C)Avg low (°C)
12-5
21-6
31-6
41-6
51-7
60-7
70-7
80-8
9-1-8
10-1-8
11-1-8
12-1-9
13-1-9
14-2-9
15-2-9
16-2-9
17-2-10
18-2-10
19-2-10
20-2-10
21-3-10
22-3-10
23-3-10
24-3-11
25-3-11
26-3-11
27-3-11
28-3-11
29-4-11
30-4-12
31-4-12

How December really feels in Saint-Hyacinthe

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
31
31 feel bitter (≤ -10°C)

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Saint-Hyacinthe weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-5° / -14°7510.8108.90.0
Feb-4° / -13°619.28.410.10.0
Mar / -7°7410.6711.60.1
Apr11° / 9911.52.613.32.6
May19° / 10012.4014.75.6
Jun24° / 13°10812.5015.46.3
Jul26° / 16°10212.9015.16.2
Aug25° / 15°10612013.96.6
Sep20° / 10°9410.2012.36.3
Oct13° / 10911.40.610.73.4
Nov / -2°8711.43.99.30.5
Dec-2° / -9°8611.99.38.60.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
43070
53070
63070
73169
83169
93169
103169
113169
123169
133070
143169
153169
163070
173070
182971
192971
202971
213070
223070
232971
242971
253070
263070
273070
283070
293070
303070
313070

Chance of precipitation in December

Any precipitationSnow

Saint-Hyacinthe gets around 86 mm of rain and snow over 11.9 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 41% on the wettest days, and about 9 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
14124
24025
34025
44025
53926
63926
73926
83827
93827
103828
113728
123729
133729
143730
153730
163730
173831
183831
193831
203832
213932
223933
233933
243933
253934
264034
274034
284034
294035
304035
314035

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 12 km/h in December.

Across December, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212calm
1312calm
1412calm
1512calm
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 48 min at the start of December to 8 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over December. Sunrise moves from 7:19 AM to 7:39 AM, and sunset from 4:04 PM to 4:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.87:194:04
28.77:204:04
38.77:214:04
48.77:224:03
58.77:234:03
68.67:244:03
78.67:254:03
88.67:264:03
98.67:274:03
108.67:284:03
118.67:294:03
128.67:304:03
138.57:304:03
148.57:314:03
158.57:324:03
168.57:334:03
178.57:334:04
188.57:344:04
198.57:344:04
208.57:354:05
218.57:364:05
228.57:364:06
238.57:364:06
248.57:374:07
258.57:374:07
268.57:384:08
278.57:384:08
288.57:384:09
298.57:384:10
308.57:394:10
318.57:394:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.25 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.25 kWh/m² to a high of 5.93 kWh/m² in June across the year — December's 1.25 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.3Dim
21.3Dim
31.3Dim
41.3Dim
51.3Dim
61.3Dim
71.3Dim
81.3Dim
91.3Dim
101.3Dim
111.3Dim
121.3Dim
131.3Dim
141.3Dim
151.3Dim
161.3Dim
171.3Dim
181.3Dim
191.3Dim
201.3Dim
211.3Dim
221.3Dim
231.3Dim
241.3Dim
251.3Dim
261.3Dim
271.3Dim
281.3Dim
291.3Dim
301.3Dim
311.3Dim
Planning a trip in December

Is December a good time to visit Saint-Hyacinthe?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Saint-Hyacinthe.

What to pack for Saint-Hyacinthe in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Saint-Hyacinthe sees daytime highs around -2°C and nights near -9°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

UV index in Saint-Hyacinthe in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint-Hyacinthe peaks around July 13 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 13UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul8Very high
Aug3Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Saint-Hyacinthe?

Saint-Hyacinthe sits at 45.6°N, 73.0°W, 32 m above sea level, in Canada. The nearest listed city is Mont-Saint-Hilaire, 19 km away.

Topography around Saint-Hyacinthe

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Hyacinthe.

Within 3 km, the terrain around Saint-Hyacinthe has only modest variations in elevation — a maximum elevation change of 35 m around an average of 34 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 266 m; within 80 km, large variations in elevation — a maximum elevation change of 1,096 m.

The land around Saint-Hyacinthe is covered by artificial surfaces (41%) and cropland (27%) within 3 km, cropland (75%) within 16 km, and trees (44%) and cropland (40%) within 80 km.

3 km
35 m
16 km
266 m
80 km
1,096 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Mont-Saint-Hilaire 19 km · Beloeil 21 km · Saint-Basile-le-Grand 28 km · Sainte-Julie 30 km · Granby 31 km · Chambly 32 km · Saint-Bruno-de-Montarville 32 km · Varennes 37 km

Canada travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 83% of US
price level, 2025
GDP per capita
$55,698
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
2
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 53%none 35%Muslim 5%Hindu 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Saint-Hyacinthe (45.6308°, -72.957°, elevation 32 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).