Theunissen weather in December

In December, Theunissen sees average daytime highs of 30°C and overnight lows near 16°C, with 89 mm of rain across 12.9 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 46% of the time in December, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of December to 13 h 48 min by month's end. Set against the rest of the year, December is Theunissen's 12th-clearest and 3rd-windiest month. For the whole year in context, see Theunissen's year-round climate.

Daytime high
30°
2nd warmest
Overnight low
16°
10th coldest
Rainfall
89 mm
12.9 wet days
Daylight
13 h 48 min
5:15 AM – 7:03 PM
Cloud cover
45%
12th clearest
Wind
13 km/h
3rd windiest
Solar energy
7.54 kWh/m²
Travel score
5.0
out of 10

Theunissen is place in Free State, South Africa.

Founded
1907

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 30°C through the month.

A typical December day in Theunissen reaches about 30°C in the afternoon and slips back to 16°C overnight — a 14°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 34°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12915
22915
32915
42915
52915
62915
72915
82916
92916
102916
112916
123016
133016
143016
153016
163016
173016
183016
193016
203016
213016
223017
233017
243017
253017
263017
273017
283017
293017
303017
313017

How December really feels in Theunissen

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

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Theunissen weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 17°9613.613.64.9
Feb29° / 17°7911.8135.4
Mar27° / 15°7510.612.26.6
Apr24° / 11°497.411.37.7
May21° / 213.310.68.2
Jun18° / 121.810.27.8
Jul18° / 71.310.48.0
Aug21° / 162.4118.5
Sep25° / 142.611.88.6
Oct27° / 12°527.812.77.2
Nov28° / 14°769.513.46.0
Dec30° / 16°8912.913.85.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 26% of December, with mostly cloudy or overcast conditions the remaining 28%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16832
26832
36832
46832
56832
66832
76832
86832
97030
107030
117129
127129
137129
147228
157327
167327
177426
187426
197426
207426
217525
227426
237426
247525
257426
267525
277525
287525
297624
307624
317624

Chance of precipitation in December

Any precipitation

Theunissen gets around 89 mm of rain over 12.9 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
340
440
541
641
741
841
942
1042
1142
1242
1342
1442
1541
1641
1741
1841
1941
2041
2141
2241
2341
2441
2541
2641
2741
2841
2941
3041
3141

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 63% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
175223
274233
373243
472253
571263
671272
770282
868293
968293
1067303
1167303
1267303
1366304
1466304
1565305
1665305
1764306
1862317
1962317
2061318
2160319
22593110
23573211
24563212
25563212
26543313
27543313
28533314
29523414
30523414
31523414

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 13 h 42 min at the start of December to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:13 AM to 5:23 AM, and sunset from 6:53 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:136:53
213.75:136:54
313.75:136:55
413.75:136:55
513.75:136:56
613.75:136:57
713.75:136:58
813.75:136:58
913.85:136:59
1013.85:147:00
1113.85:147:00
1213.85:147:01
1313.85:147:01
1413.85:157:02
1513.85:157:03
1613.85:157:03
1713.85:167:04
1813.85:167:04
1913.85:177:05
2013.85:177:05
2113.85:177:06
2213.85:187:06
2313.85:187:07
2413.85:197:07
2513.85:197:08
2613.85:207:08
2713.85:207:09
2813.85:217:09
2913.85:227:09
3013.85:227:10
3113.85:237:10

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.54 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.66 kWh/m² to a high of 7.54 kWh/m² in December across the year — December's 7.54 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.5Intense
57.5Intense
67.5Intense
77.5Intense
87.5Intense
97.5Intense
107.5Intense
117.5Intense
127.6Intense
137.6Intense
147.6Intense
157.6Intense
167.6Intense
177.6Intense
187.6Intense
197.6Intense
207.6Intense
217.6Intense
227.6Intense
237.6Intense
247.6Intense
257.6Intense
267.6Intense
277.6Intense
287.6Intense
297.5Intense
307.5Intense
317.5Intense
Planning a trip in December

Hazard calendar for Theunissen

In seasonPeak

In December, Theunissen sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Theunissen's rainy season runs October–April, when most of the year's rain falls.

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

Is December a good time to visit Theunissen?

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

5.0
Sightseeing
11th-best month of the year
6.8
Beach & pool
6th-best month of the year

December is a reasonable time to visit Theunissen for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Theunissen in December

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

In December, Theunissen sees daytime highs around 30°C and nights near 16°C. Pack light clothes and sun protection. Worth having: rain gear. About 13 days see rain.

light clothessun protectionrain gear

UV index in Theunissen in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Theunissen peaks around January 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 5 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 14UV 15Jun 21UV 5
UV index (midday)Level
Jan15Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May6High
Jun5Moderate
Jul5Moderate
Aug7High
Sep9Very high
Oct11Extreme
Nov12Extreme
Dec14Extreme

Air quality in Theunissen in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Theunissen is worst in July — around 25 µg/m³ PM2.5 (moderate), about 3.7× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1025 µg/m³Dec 187 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar13Moderate
Apr16Moderate
May21Moderate
Jun24Moderate
Jul25Moderate
Aug23Moderate
Sep22Moderate
Oct16Moderate
Nov8Good
Dec7Good
Location & terrain

Where is Theunissen?

Theunissen sits at 28.4°S, 26.7°E, 1,406 m above sea level, in South Africa. The nearest listed city is Winburg, 32 km away.

Topography around Theunissen

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

Within 3 km, the terrain around Theunissen has only modest variations in elevation — a maximum elevation change of 87 m around an average of 1,393 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 303 m; within 80 km, large variations in elevation — a maximum elevation change of 626 m.

The land around Theunissen is covered by grassland (69%) within 3 km, grassland (74%) and cropland (23%) within 16 km, and grassland (64%) and cropland (33%) within 80 km.

3 km
87 m
16 km
303 m
80 km
626 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Winburg 32 km · Virginia 38 km · Winnie Mandela 40 km · Welkom 48 km · Bultfontein 56 km · Hennenman 58 km · Phomolong 58 km · Odendaalsrus 60 km

South Africa travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / M / N
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$6,598
2025
Happiness
5.0 / 10
World Happiness, 2025
Safe drinking water
68%
of population, 2024
Homicide rate
43.7
per 100k, 2022
Road deaths
22.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very high
EF EPI 602
Religion
Christian 86%or other traditional African religions 5%nothing in particular 5%Muslim 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 Theunissen (-28.411°, 26.7011°, elevation 1,406 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).