Blackwood weather in January

In January, Blackwood sees average daytime highs of 6°C and overnight lows near 2°C, with 100 mm of precipitation across 14.6 wet days and about 8.1 hours of daylight. It is the 12th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 6°C through the month. The sky is clear or mostly clear about 12% of the time in January, and the air most often feels dry.

Daylight stretches from about 7 h 36 min at the start of January to 8 h 42 min by month's end. Set against the rest of the year, January is Blackwood's 11th-clearest and 1st-windiest month. For the whole year in context, see Blackwood's year-round climate.

Daytime high
12th warmest
Overnight low
2nd coldest
Precipitation
100 mm
14.6 wet days
Daylight
8 h 06 min
8:20 AM – 4:24 PM
Cloud cover
77%
11th clearest
Wind
16 km/h
1st windiest
Solar energy
0.79 kWh/m²
Travel score
0.5
out of 10

Blackwood is town and community in Caerphilly County Borough, Wales.

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 6°C through the month.

A typical January day in Blackwood reaches about 6°C in the afternoon and slips back to 2°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 10°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)
162
262
362
462
562
662
772
872
972
1072
1172
1272
1372
1472
1572
1672
1772
1872
1962
2062
2162
2262
2362
2462
2562
2662
2762
2862
2962
3062
3162

How January really feels in Blackwood

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.

Blackwood weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 10014.61.78.10.5
Feb / 8011.41.99.60.7
Mar / 7612.71.411.51.6
Apr12° / 8012.90.513.62.8
May15° / 8913.6015.43.9
Jun17° / 10°8312.2016.35.0
Jul19° / 12°8413015.95.6
Aug19° / 12°9012.6014.45.5
Sep16° / 10°7711.2012.44.8
Oct13° / 11113.60.110.43.1
Nov / 10313.90.68.61.7
Dec / 10813.31.67.70.7

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 13% of January, with mostly cloudy or overcast conditions the remaining 75%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22377
32377
42377
52476
62476
72476
82575
92476
102575
112575
122575
132575
142575
152575
162575
172674
182674
192674
202674
212674
222476
232476
242575
252575
262575
272575
282575
292575
302575
312476

Chance of precipitation in January

Any precipitationSnow

Blackwood gets around 100 mm of rain and snow over 14.6 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 47% and peaks near 51% on the wettest days, and about 2 days bring snow. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
1496
2496
3506
4506
5516
6516
7516
8516
9516
10516
11516
12506
13506
14496
15496
16486
17476
18466
19465
20455
21445
22445
23435
24435
25426
26426
27426
28416
29416
30416
31416

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 16 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 16 km/h on the calmest days to 16 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
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 7 h 36 min at the start of January to 8 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over January. Sunrise moves from 8:27 AM to 8:04 AM, and sunset from 4:05 PM to 4:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.68:274:05
27.78:264:06
37.78:264:07
47.78:264:08
57.78:264:10
67.78:264:11
77.88:254:12
87.88:254:13
97.88:254:14
107.98:244:16
117.98:244:17
127.98:234:18
138.08:224:20
148.08:224:21
158.08:214:22
168.18:204:24
178.18:204:25
188.18:194:27
198.28:184:28
208.28:174:30
218.38:164:32
228.38:154:33
238.48:144:35
248.48:134:37
258.48:124:38
268.58:104:40
278.58:094:42
288.68:084:43
298.68:074:45
308.78:054:47
318.78:044:48

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.79 kWh/m².

For context, solar energy here swings from a low near 0.63 kWh/m² to a high of 5.27 kWh/m² in June across the year — January's 0.79 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.6Dim
20.6Dim
30.6Dim
40.7Dim
50.7Dim
60.7Dim
70.7Dim
80.7Dim
90.7Dim
100.7Dim
110.7Dim
120.7Dim
130.7Dim
140.8Dim
150.8Dim
160.8Dim
170.8Dim
180.8Dim
190.8Dim
200.8Dim
210.9Dim
220.9Dim
230.9Dim
240.9Dim
250.9Dim
261.0Dim
271.0Dim
281.0Dim
291.0Dim
301.1Dim
311.1Dim
Planning a trip in January

Is January a good time to visit Blackwood?

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

0.5
Sightseeing
12th-best month of the year
0.0
Beach & pool
7th-best month of the year

January is a weaker month for outdoor sightseeing in Blackwood.

What to pack for Blackwood in January

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

In January, Blackwood sees daytime highs around 6°C and nights near 2°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 15 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Blackwood 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 33 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
Mar8Bracing
Apr9Bracing
May12Bracing
Jun15Cool
Jul17Cool
Aug18Cool
Sep17Cool
Oct15Bracing
Nov12Bracing
Dec9Bracing

UV index in Blackwood 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 Blackwood peaks around August 13 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 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul6High
Aug7High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Blackwood?

Blackwood sits at 51.7°N, 3.2°W, 227 m above sea level, in United Kingdom. The nearest listed city is Gelligaer, 3.0 km away.

Topography around Blackwood

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

Within 3 km, the terrain around Blackwood has only modest variations in elevation — a maximum elevation change of 201 m around an average of 198 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 568 m; within 80 km, large variations in elevation — a maximum elevation change of 864 m.

The land around Blackwood is covered by trees (46%), grassland (28%) and artificial surfaces (26%) within 3 km, grassland (47%) and trees (40%) within 16 km, and grassland (52%) within 80 km.

3 km
201 m
16 km
568 m
80 km
864 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Gelligaer 3.0 km · Risca 10 km · Caerphilly 10 km · Pontypridd 12 km · Pontypool 12 km · Ebbw Vale 12 km · Cwmbran 13 km · Merthyr Tydfil 15 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 Blackwood (51.6678°, -3.2075°, elevation 227 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).