St Austell weather in December

In December, St Austell sees average daytime highs of 10°C and overnight lows near 6°C, with 91 mm of precipitation across 14 wet days and about 7.9 hours of daylight. It is the 10th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 10°C through the month. The sky is clear or mostly clear about 13% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 06 min at the start of December to 7 h 54 min by month's end. Set against the rest of the year, December is St Austell's 9th-clearest and 2nd-windiest month. For the whole year in context, see St Austell's year-round climate.

Daytime high
10°
10th warmest
Overnight low
4th coldest
Precipitation
91 mm
14 wet days
Daylight
7 h 48 min
8:21 AM – 4:10 PM
Cloud cover
73%
9th clearest
Wind
23 km/h
2nd windiest
Solar energy
0.73 kWh/m²
Travel score
1.9
out of 10

St Austell is town in Cornwall, England, UK.

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 10°C through the month.

A typical December day in St Austell reaches about 10°C in the afternoon and slips back to 6°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 13°C. Set against its neighbours, December runs about 2°C cooler than November and on par with January.

10°15°151015202531
Avg high (°C)Avg low (°C)
1107
2107
3107
4107
5107
6107
7107
8107
9107
10107
11107
12107
13106
14106
15106
16106
17106
18106
19106
20106
21106
22106
23106
24106
2596
2696
2796
2896
2996
3096
3196

St Austell weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan / 8614.48.31.6
Feb / 6811.79.71.6
Mar10° / 6411.811.52.1
Apr12° / 6612.413.52.9
May14° / 6311.415.24.0
Jun17° / 12°6311.416.15.1
Jul19° / 14°6310.615.75.9
Aug19° / 14°6711.114.35.8
Sep17° / 13°5810.212.45.4
Oct14° / 11°9013.510.53.8
Nov12° / 9114.48.82.6
Dec10° / 91147.91.9

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% 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 73%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23070
33070
43169
53169
63169
73169
83070
92971
102872
112872
122773
132773
142674
152674
162674
172575
182575
192575
202575
212575
222575
232575
242575
252575
262575
272476
282476
292476
302476
312476

Chance of precipitation in December

Any precipitation

St Austell gets around 91 mm of rain and snow over 14 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 45% and peaks near 47% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202531
Rain chance (%)
147
246
345
445
544
643
743
843
943
1043
1143
1244
1344
1444
1545
1645
1746
1846
1946
2047
2147
2247
2347
2447
2547
2647
2747
2847
2947
3047
3147

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 23 km/h in December.

Across December, daily wind ranges from about 23 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
123breezy
223breezy
323breezy
423breezy
523breezy
623breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1423breezy
1523breezy
1623breezy
1723breezy
1823breezy
1923breezy
2023breezy
2123breezy
2223breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2823breezy
2924breezy
3024breezy
3124breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 06 min at the start of December to 7 h 54 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 8:05 AM to 8:27 AM, and sunset from 4:13 PM to 4:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.18:054:13
28.18:064:12
38.18:084:12
48.08:094:11
58.08:104:11
68.08:114:11
78.08:124:10
87.98:134:10
97.98:144:10
107.98:154:10
117.98:164:10
127.98:174:10
137.98:184:10
147.88:194:10
157.88:204:10
167.88:214:10
177.88:214:10
187.88:224:10
197.88:234:11
207.88:234:11
217.88:244:11
227.88:244:12
237.88:254:12
247.88:254:13
257.88:254:14
267.88:264:14
277.88:264:15
287.88:264:16
297.88:264:16
307.88:264:17
317.98:274:18

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.73 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.73 kWh/m² to a high of 5.47 kWh/m² in June across the year — December's 0.73 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.8Dim
20.8Dim
30.8Dim
40.8Dim
50.8Dim
60.8Dim
70.8Dim
80.8Dim
90.8Dim
100.8Dim
110.8Dim
120.7Dim
130.7Dim
140.7Dim
150.7Dim
160.7Dim
170.7Dim
180.7Dim
190.7Dim
200.7Dim
210.7Dim
220.7Dim
230.7Dim
240.7Dim
250.7Dim
260.7Dim
270.7Dim
280.7Dim
290.7Dim
300.7Dim
310.7Dim
Planning a trip in December

Is December a good time to visit St Austell?

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

1.9
Sightseeing
10th-best month of the year
0.0
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in St Austell.

What to pack for St Austell in December

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

In December, St Austell sees daytime highs around 10°C and nights near 6°C. Pack a warm layer and rain gear. Worth having: a windbreaker. About 14 days see rain.

a warm layerrain geara windbreaker

Sea temperature near St Austell in December

The nearest coast averages about 11°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in August at about 17°C and coldest in March near 9°C.

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

10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan10Bracing
Feb10Bracing
Mar9Bracing
Apr10Bracing
May12Bracing
Jun14Bracing
Jul16Cool
Aug17Cool
Sep16Cool
Oct15Bracing
Nov13Bracing
Dec11Bracing

UV index in St Austell 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 St Austell peaks around August 13 at about 7 (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 13UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr5Moderate
May6High
Jun6High
Jul6High
Aug7High
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is St Austell?

St Austell sits at 50.3°N, 4.8°W, 73 m above sea level, in United Kingdom. The nearest listed city is Bodmin, 15 km away.

Topography around St Austell

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

Within 3 km, the terrain around St Austell has significant variations in elevation — a maximum elevation change of 266 m around an average of 94 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 362 m; within 80 km, large variations in elevation — a maximum elevation change of 613 m.

The land around St Austell is covered by trees (36%) and grassland (34%) within 3 km, grassland (40%), water (26%) and trees (20%) within 16 km, and water (59%) and grassland (28%) within 80 km.

3 km
266 m
16 km
362 m
80 km
613 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Bodmin 15 km · Truro 22 km · Newquay 23 km · Falmouth 30 km · Redruth 34 km · Saltash 40 km · Camborne 40 km · Plymouth 45 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 St Austell (50.3425°, -4.7744°, elevation 73 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).