Slough weather in December

In December, Slough sees average daytime highs of 8°C and overnight lows near 3°C, with 58 mm of precipitation across 11 wet days and about 7.7 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 8°C through the month. The sky is clear or mostly clear about 16% of the time in December, and the air most often feels dry.

Daylight stretches from about 7 h 54 min at the start of December to 7 h 42 min by month's end. Set against the rest of the year, December is Slough's 8th-clearest and 3rd-windiest month. For the whole year in context, see Slough's year-round climate.

Daytime high
10th warmest
Overnight low
3rd coldest
Precipitation
58 mm
11 wet days
Daylight
7 h 36 min
8:10 AM – 3:47 PM
Cloud cover
72%
8th clearest
Wind
17 km/h
3rd windiest
Solar energy
0.65 kWh/m²
Travel score
1.2
out of 10

Slough is town in Berkshire, England, UK.

Density
5,064/km²
people per km²

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 8°C through the month.

A typical December day in Slough reaches about 8°C in the afternoon and slips back to 3°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 3°C and 12°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
194
294
394
484
584
684
784
883
983
1083
1183
1283
1383
1483
1583
1683
1783
1883
1983
2083
2173
2273
2373
2473
2573
2673
2773
2873
2973
3073
3173

How December really feels in Slough

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 28 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
28
wind chill below the day's low

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

Slough weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5510.90.98.11.0
Feb / 449.11.19.61.2
Mar10° / 4310.10.611.52.3
Apr13° / 4911.20.213.53.5
May16° / 529.8015.35.0
Jun19° / 11°559.9016.35.9
Jul22° / 13°5310.6015.96.4
Aug21° / 13°6010.3014.46.3
Sep18° / 11°488.9012.45.8
Oct14° / 6011.2010.44.0
Nov10° / 64110.18.62.3
Dec / 58110.87.71.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 69%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33268
43367
53367
63367
73466
83565
93565
103565
113466
123466
133466
143268
153268
163169
172971
182971
192872
202872
212872
222971
232872
242872
252872
262872
272971
282872
292872
302872
312872

Chance of precipitation in December

Any precipitationSnow

Slough gets around 58 mm of rain and snow over 11 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 36% and peaks near 38% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1362
2362
3352
4352
5352
6342
7342
8342
9342
10342
11342
12342
13352
14352
15362
16362
17372
18373
19373
20383
21383
22383
23383
24383
25383
26373
27373
28373
29373
30373
31373

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 17 km/h in December.

Across December, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 7 h 54 min at the start of December to 7 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:54 AM to 8:16 AM, and sunset from 3:50 PM to 3:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.97:543:50
27.97:553:50
37.97:563:49
47.97:583:49
57.87:593:49
67.88:003:48
77.88:013:48
87.88:023:48
97.78:033:47
107.78:043:47
117.78:053:47
127.78:063:47
137.78:073:47
147.68:083:47
157.68:093:47
167.68:103:47
177.68:113:47
187.68:113:48
197.68:123:48
207.68:123:48
217.68:133:49
227.68:143:49
237.68:143:50
247.68:143:50
257.68:153:51
267.68:153:51
277.68:153:52
287.68:153:53
297.68:163:54
307.68:163:54
317.78:163:55

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.65 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.65 kWh/m² to a high of 5.19 kWh/m² in June across the year — December's 0.65 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
90.7Dim
100.7Dim
110.7Dim
120.7Dim
130.7Dim
140.7Dim
150.6Dim
160.6Dim
170.6Dim
180.6Dim
190.6Dim
200.6Dim
210.6Dim
220.6Dim
230.6Dim
240.6Dim
250.6Dim
260.6Dim
270.6Dim
280.6Dim
290.6Dim
300.6Dim
310.6Dim
Planning a trip in December

Is December a good time to visit Slough?

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

1.2
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 Slough.

What to pack for Slough in December

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

In December, Slough sees daytime highs around 8°C and nights near 3°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

UV index in Slough 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 Slough peaks around August 10 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 10UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May6High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Slough?

Slough sits at 51.5°N, 0.6°W, 33 m above sea level, in United Kingdom. The nearest listed city is Windsor, 3.0 km away.

Topography around Slough

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

Within 3 km, the terrain around Slough has only modest variations in elevation — a maximum elevation change of 47 m around an average of 28 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, significant variations in elevation — a maximum elevation change of 301 m.

The land around Slough is covered by artificial surfaces (41%), grassland (30%) and trees (23%) within 3 km, trees (38%) and grassland (32%) within 16 km, and grassland (32%), cropland (31%) and trees (27%) within 80 km.

3 km
47 m
16 km
170 m
80 km
301 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Windsor 3.0 km · Maidenhead 9.0 km · Gerrards Cross 9.0 km · Uxbridge 9.0 km · Egham 9.0 km · Staines 11 km · Chalfont Saint Peter 11 km · Hayes 12 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 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 Slough (51.5095°, -0.5954°, elevation 33 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).