Grande-Synthe weather in January

In January, Grande-Synthe sees average daytime highs of 7°C and overnight lows near 3°C, with 56 mm of precipitation across 11.8 wet days and about 8.2 hours of daylight. It is the 12th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 7°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 7 h 48 min at the start of January to 8 h 48 min by month's end. Set against the rest of the year, January is Grande-Synthe's 9th-clearest and 1st-windiest month. For the whole year in context, see Grande-Synthe's year-round climate.

Daytime high
12th warmest
Overnight low
2nd coldest
Precipitation
56 mm
11.8 wet days
Daylight
8 h 12 min
8:55 AM – 5:05 PM
Cloud cover
72%
9th clearest
Wind
19 km/h
1st windiest
Solar energy
0.85 kWh/m²
Travel score
0.9
out of 10
Air quality
Good
PM10 23.4 µg/m³ · 2019

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 7°C through the month.

A typical January day in Grande-Synthe reaches about 7°C in the afternoon and slips back to 3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 11°C. Set against its neighbours, January runs on par with December and on par with February.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
173
273
373
473
573
674
774
874
974
1074
1174
1273
1373
1473
1573
1673
1773
1873
1973
2073
2173
2273
2373
2473
2573
2673
2773
2873
2973
3073
3173

How January really feels in Grande-Synthe

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
0
heat index over the day's high
Days feeling ≤ C
31
wind chill below the day's low

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

Grande-Synthe weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5611.80.98.20.9
Feb / 47100.89.61.1
Mar10° / 4610.60.511.52.3
Apr13° / 4410.20.113.53.7
May16° / 10°5410.7015.35.1
Jun19° / 12°549.9016.26.0
Jul22° / 15°5410.5015.86.5
Aug22° / 15°6310.5014.36.5
Sep19° / 13°559.8012.45.9
Oct15° / 10°6511.9010.44.2
Nov11° / 6512.80.38.72.3
Dec / 6812.50.87.81.1

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 15% of January, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22971
32971
42971
53070
63070
73070
83070
93169
103169
113268
123268
133268
143268
153268
163268
173268
183268
193268
203169
213070
223070
232971
242971
252872
262872
272773
282773
292674
302773
312773

Chance of precipitation in January

Any precipitationSnow

Grande-Synthe gets around 56 mm of rain and snow over 11.8 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 38% and peaks near 41% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1413
2413
3413
4403
5403
6403
7393
8393
9393
10393
11383
12383
13383
14383
15383
16373
17372
18372
19372
20372
21372
22372
23372
24372
25373
26363
27363
28353
29353
30353
31343

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.

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 January

Winds average 19 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 19 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
520light breeze
620light breeze
720light breeze
820light breeze
920light breeze
1020light breeze
1120light breeze
1220light breeze
1320light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze
3119light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 7 h 48 min at the start of January to 8 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over January. Sunrise moves from 9:01 AM to 8:39 AM, and sunset from 4:47 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.89:014:47
27.89:014:48
37.89:014:49
47.89:014:50
57.89:014:51
67.99:004:52
77.99:004:53
87.99:004:54
97.98:594:55
108.08:594:57
118.08:584:58
128.08:584:59
138.18:575:01
148.18:575:02
158.18:565:03
168.28:555:05
178.28:555:06
188.28:545:08
198.38:535:09
208.38:525:11
218.48:515:12
228.48:505:14
238.48:495:16
248.58:485:17
258.58:475:19
268.68:465:20
278.68:455:22
288.78:435:24
298.78:425:25
308.88:415:27
318.88:395:29

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.85 kWh/m².

For context, solar energy here swings from a low near 0.66 kWh/m² to a high of 5.63 kWh/m² in June across the year — January's 0.85 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.7Dim
20.7Dim
30.7Dim
40.7Dim
50.7Dim
60.7Dim
70.7Dim
80.7Dim
90.8Dim
100.8Dim
110.8Dim
120.8Dim
130.8Dim
140.8Dim
150.8Dim
160.8Dim
170.8Dim
180.9Dim
190.9Dim
200.9Dim
210.9Dim
220.9Dim
231.0Dim
241.0Dim
251.0Dim
261.0Dim
271.0Dim
281.1Dim
291.1Dim
301.1Dim
311.1Dim
Planning a trip in January

Is January a good time to visit Grande-Synthe?

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

0.9
Sightseeing
12th-best month of the year
0.0
Beach & pool
8th-best month of the year

January is a weaker month for outdoor sightseeing in Grande-Synthe.

What to pack for Grande-Synthe in January

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

In January, Grande-Synthe sees daytime highs around 7°C and nights near 3°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Grande-Synthe in January

The nearest coast averages about 8°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in August at about 18°C and coldest in February near 7°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan8Bracing
Feb7Bracing
Mar7Bracing
Apr9Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct15Cool
Nov13Bracing
Dec10Bracing

UV index in Grande-Synthe 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 Grande-Synthe peaks around June 22 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 22UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Grande-Synthe?

Grande-Synthe sits at 51.0°N, 2.3°E, 2 m above sea level, in France. The nearest listed city is Saint-Pol-sur-Mer, 3.0 km away.

Topography around Grande-Synthe

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

Within 3 km, the terrain around Grande-Synthe has only modest variations in elevation — a maximum elevation change of 42 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, significant variations in elevation — a maximum elevation change of 290 m.

The land around Grande-Synthe is covered by artificial surfaces (50%) and trees (22%) within 3 km, water (39%) and cropland (37%) within 16 km, and water (38%) and cropland (34%) within 80 km.

3 km
42 m
16 km
52 m
80 km
290 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Saint-Pol-sur-Mer 3.0 km · Dunkirk 6.0 km · Coudekerque-Branche 7.0 km · Koksijde 26 km · Saint-Omer 30 km · Calais 32 km · Poperinge 35 km · Hazebrouck 36 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 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 Grande-Synthe (51.0154°, 2.2997°, elevation 2 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).