Cornwall weather in January

In January, Cornwall sees average daytime highs of -4°C and overnight lows near -12°C, with 73 mm of precipitation across 11.4 wet days and about 9 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near -4°C through the month. The sky is clear or mostly clear about 15% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 36 min at the start of January to 9 h 30 min by month's end. Set against the rest of the year, January is Cornwall's 11th-clearest and 1st-windiest month. For the whole year in context, see Cornwall's year-round climate.

Daytime high: -4°; 12th warmest
Overnight low: -12°; 1st coldest
Precipitation: 73 mm; 11.4 wet days
Daylight: 8 h 54 min; 7:40 AM – 4:36 PM
Cloud cover: 75%; 11th clearest
Wind: 12 km/h; 1st windiest
Solar energy: 1.62 kWh/m²
Travel score: 0.0; out of 10

Cornwall is city in Ontario, Canada.

Air quality: Good; PM2.5 6 µg/m³ · 2019
Density: 793/km²; people per km²
Founded: 1784

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← December Cornwall year-round climate February →Best places to visit in January

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near -4°C through the month.

A typical January day in Cornwall reaches about -4°C in the afternoon and slips back to -12°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between -13°C and 4°C. Set against its neighbours, January runs about 4°C cooler than December and about 2°C cooler than February.

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

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

How January really feels in Cornwall

Once humidity and wind are folded in, January 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

heat index over the day's high

Days feeling ≤ 0°C

31 feel bitter (≤ -10°C)

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

Cornwall weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-4° / -12°	73	11.4	10.5	9	0.0
Feb	-2° / -12°	61	10	8.7	10.1	0.0
Mar	3° / -6°	76	11.2	7	11.6	0.2
Apr	12° / 2°	101	12.1	2.8	13.2	2.8
May	19° / 8°	98	12.2	0.1	14.6	5.6
Jun	24° / 13°	105	12.4	0	15.4	6.3
Jul	26° / 16°	100	12.9	0	15.1	6.2
Aug	25° / 15°	94	11.6	0	13.9	6.6
Sep	21° / 11°	93	10.5	0	12.3	6.4
Oct	13° / 5°	105	12	0.6	10.7	3.6
Nov	6° / -1°	84	12.4	3.7	9.3	0.6
Dec	-0° / -7°	82	12.4	9.3	8.6	0.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 74%. Skies tend to open up as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	21	21	22	22	22	22	22	22	23	24	24	24	24	25	27	27	27	28	28	28	28	28	29	29	30	30	30	30	32	32	32
Cloudier (%)	79	79	78	78	78	78	78	78	77	76	76	76	76	75	73	73	73	72	72	72	72	72	71	71	70	70	70	70	68	68	68

	Clearer (%)	Cloudier (%)
1	21	79
2	21	79
3	22	78
4	22	78
5	22	78
6	22	78
7	22	78
8	22	78
9	23	77
10	24	76
11	24	76
12	24	76
13	24	76
14	25	75
15	27	73
16	27	73
17	27	73
18	28	72
19	28	72
20	28	72
21	28	72
22	28	72
23	29	71
24	29	71
25	30	70
26	30	70
27	30	70
28	30	70
29	32	68
30	32	68
31	32	68

Chance of precipitation in January

Any precipitationSnow

Cornwall gets around 73 mm of rain and snow over 11.4 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 37% and peaks near 41% on the wettest days, and about 11 days bring snow. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	41	41	41	41	41	41	41	41	40	40	39	39	38	38	37	37	36	35	35	34	34	33	33	33	33	33	33	33	33	33	33
Snow chance (%)	34	35	35	35	36	36	36	36	35	35	35	35	34	34	34	33	33	33	33	32	32	32	32	32	32	32	32	32	32	32	32

	Rain chance (%)	Snow chance (%)
1	41	34
2	41	35
3	41	35
4	41	35
5	41	36
6	41	36
7	41	36
8	41	36
9	40	35
10	40	35
11	39	35
12	39	35
13	38	34
14	38	34
15	37	34
16	37	33
17	36	33
18	35	33
19	35	33
20	34	32
21	34	32
22	33	32
23	33	32
24	33	32
25	33	32
26	33	32
27	33	32
28	33	32
29	33	32
30	33	32
31	33	32

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in January

Winds average 12 km/h in January, the windiest month of the year.

Across January, 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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	12	light breeze
2	12	light breeze
3	12	light breeze
4	12	light breeze
5	12	light breeze
6	12	light breeze
7	12	light breeze
8	12	light breeze
9	12	light breeze
10	12	light breeze
11	12	light breeze
12	12	light breeze
13	12	light breeze
14	12	light breeze
15	12	light breeze
16	12	light breeze
17	12	light breeze
18	12	light breeze
19	12	light breeze
20	12	light breeze
21	12	light breeze
22	12	light breeze
23	12	light breeze
24	12	light breeze
25	12	calm
26	12	calm
27	12	calm
28	12	calm
29	12	calm
30	12	calm
31	12	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 36 min at the start of January to 9 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over January. Sunrise moves from 7:43 AM to 7:29 AM, and sunset from 4:21 PM to 4:56 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	8.6	8.6	8.7	8.7	8.7	8.7	8.7	8.7	8.8	8.8	8.8	8.8	8.9	8.9	8.9	8.9	9.0	9.0	9.0	9.1	9.1	9.1	9.2	9.2	9.2	9.3	9.3	9.3	9.4	9.4	9.5
Sunrise (AM)	7:43	7:43	7:43	7:43	7:43	7:43	7:43	7:43	7:43	7:42	7:42	7:42	7:41	7:41	7:41	7:40	7:40	7:39	7:38	7:38	7:37	7:36	7:36	7:35	7:34	7:33	7:32	7:32	7:31	7:30	7:29
Sunset (PM)	4:21	4:22	4:23	4:24	4:25	4:25	4:26	4:27	4:28	4:30	4:31	4:32	4:33	4:34	4:35	4:36	4:38	4:39	4:40	4:41	4:43	4:44	4:45	4:46	4:48	4:49	4:50	4:52	4:53	4:55	4:56

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	8.6	7:43	4:21
2	8.6	7:43	4:22
3	8.7	7:43	4:23
4	8.7	7:43	4:24
5	8.7	7:43	4:25
6	8.7	7:43	4:25
7	8.7	7:43	4:26
8	8.7	7:43	4:27
9	8.8	7:43	4:28
10	8.8	7:42	4:30
11	8.8	7:42	4:31
12	8.8	7:42	4:32
13	8.9	7:41	4:33
14	8.9	7:41	4:34
15	8.9	7:41	4:35
16	8.9	7:40	4:36
17	9.0	7:40	4:38
18	9.0	7:39	4:39
19	9.0	7:38	4:40
20	9.1	7:38	4:41
21	9.1	7:37	4:43
22	9.1	7:36	4:44
23	9.2	7:36	4:45
24	9.2	7:35	4:46
25	9.2	7:34	4:48
26	9.3	7:33	4:49
27	9.3	7:32	4:50
28	9.3	7:32	4:52
29	9.4	7:31	4:53
30	9.4	7:30	4:55
31	9.5	7:29	4:56

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.62 kWh/m².

For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 5.91 kWh/m² in June across the year — January's 1.62 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	1.3	1.3	1.3	1.3	1.3	1.4	1.4	1.4	1.4	1.4	1.5	1.5	1.5	1.5	1.6	1.6	1.6	1.7	1.7	1.7	1.8	1.8	1.8	1.9	1.9	1.9	2.0	2.0	2.0	2.1	2.1
Level	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	1.3	Dim
2	1.3	Dim
3	1.3	Dim
4	1.3	Dim
5	1.3	Dim
6	1.4	Dim
7	1.4	Dim
8	1.4	Dim
9	1.4	Dim
10	1.4	Dim
11	1.5	Dim
12	1.5	Dim
13	1.5	Dim
14	1.5	Dim
15	1.6	Dim
16	1.6	Dim
17	1.6	Dim
18	1.7	Dim
19	1.7	Dim
20	1.7	Dim
21	1.8	Dim
22	1.8	Dim
23	1.8	Dim
24	1.9	Dim
25	1.9	Dim
26	1.9	Dim
27	2.0	Dim
28	2.0	Dim
29	2.0	Moderate
30	2.1	Moderate
31	2.1	Moderate

Planning a trip in January

Is January a good time to visit Cornwall?

Our two travel scores rate January 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

January is a weaker month for outdoor sightseeing in Cornwall.

What to pack for Cornwall in January

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

In January, Cornwall sees daytime highs around -4°C and nights near -12°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

UV index in Cornwall in January

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Cornwall peaks around July 14 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 10 at about 1 (low).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	3	4	6	6	8	4	5	3	2	1
Level	Low	Low	Moderate	Moderate	High	High	Very high	Moderate	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	3	Moderate
Apr	4	Moderate
May	6	High
Jun	6	High
Jul	8	Very high
Aug	4	Moderate
Sep	5	High
Oct	3	Moderate
Nov	2	Low
Dec	1	Low

Location & terrain

Where is Cornwall?

Cornwall sits at 45.0°N, 74.7°W, 59 m above sea level, in Canada. The nearest listed city is Les Coteaux, 49 km away.

Topography around Cornwall

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

Within 3 km, the terrain around Cornwall has only modest variations in elevation — a maximum elevation change of 40 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, large variations in elevation — a maximum elevation change of 1,164 m.

The land around Cornwall is covered by trees (35%) and artificial surfaces (26%) within 3 km, trees (51%) within 16 km, and trees (58%) and cropland (28%) within 80 km.

3 km

40 m

trees 35%

16 km

100 m

trees 51%

80 km

1,164 m

trees 58%

treesgrasslandcroplandartificial surfaceswaterwetland

← December Cornwall year-round climate February →Best places to visit in January

January weather nearby: Les Coteaux 49 km · Salaberry-de-Valleyfield 53 km · Saint-Lazare 63 km · Vaudreuil-Dorion 69 km · Clarence-Rockland 74 km · Orléans 78 km · Fallingbrook 78 km · Gloucester 80 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

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 Cornwall (45.0181°, -74.7281°, elevation 59 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).

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

	Clearer (%)	Cloudier (%)
1	21	79
2	21	79
3	22	78
4	22	78
5	22	78
6	22	78
7	22	78
8	22	78
9	23	77
10	24	76
11	24	76
12	24	76
13	24	76
14	25	75
15	27	73
16	27	73
17	27	73
18	28	72
19	28	72
20	28	72
21	28	72
22	28	72
23	29	71
24	29	71
25	30	70
26	30	70
27	30	70
28	30	70
29	32	68
30	32	68
31	32	68

	Rain chance (%)	Snow chance (%)
1	41	34
2	41	35
3	41	35
4	41	35
5	41	36
6	41	36
7	41	36
8	41	36
9	40	35
10	40	35
11	39	35
12	39	35
13	38	34
14	38	34
15	37	34
16	37	33
17	36	33
18	35	33
19	35	33
20	34	32
21	34	32
22	33	32
23	33	32
24	33	32
25	33	32
26	33	32
27	33	32
28	33	32
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

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

	Clearer (%)	Cloudier (%)
1	21	79
2	21	79
3	22	78
4	22	78
5	22	78
6	22	78
7	22	78
8	22	78
9	23	77
10	24	76
11	24	76
12	24	76
13	24	76
14	25	75
15	27	73
16	27	73
17	27	73
18	28	72
19	28	72
20	28	72
21	28	72
22	28	72
23	29	71
24	29	71
25	30	70
26	30	70
27	30	70
28	30	70
29	32	68
30	32	68
31	32	68

	Rain chance (%)	Snow chance (%)
1	41	34
2	41	35
3	41	35
4	41	35
5	41	36
6	41	36
7	41	36
8	41	36
9	40	35
10	40	35
11	39	35
12	39	35
13	38	34
14	38	34
15	37	34
16	37	33
17	36	33
18	35	33
19	35	33
20	34	32
21	34	32
22	33	32
23	33	32
24	33	32
25	33	32
26	33	32
27	33	32
28	33	32
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

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

	Clearer (%)	Cloudier (%)
1	21	79
2	21	79
3	22	78
4	22	78
5	22	78
6	22	78
7	22	78
8	22	78
9	23	77
10	24	76
11	24	76
12	24	76
13	24	76
14	25	75
15	27	73
16	27	73
17	27	73
18	28	72
19	28	72
20	28	72
21	28	72
22	28	72
23	29	71
24	29	71
25	30	70
26	30	70
27	30	70
28	30	70
29	32	68
30	32	68
31	32	68

	Rain chance (%)	Snow chance (%)
1	41	34
2	41	35
3	41	35
4	41	35
5	41	36
6	41	36
7	41	36
8	41	36
9	40	35
10	40	35
11	39	35
12	39	35
13	38	34
14	38	34
15	37	34
16	37	33
17	36	33
18	35	33
19	35	33
20	34	32
21	34	32
22	33	32
23	33	32
24	33	32
25	33	32
26	33	32
27	33	32
28	33	32
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100