Mount Barker weather in December

In December, Mount Barker sees average daytime highs of 25°C and overnight lows near 13°C, with 29 mm of rain across 5.3 wet days and about 14.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 24°C in the first days to 26°C by the end. The sky is clear or mostly clear about 47% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 12 min at the start of December to 14 h 18 min by month's end. Set against the rest of the year, December is Mount Barker's 4th-clearest and 6th-windiest month. For the whole year in context, see Mount Barker's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
13°
9th coldest
Rainfall
29 mm
5.3 wet days
Daylight
14 h 18 min
6:00 AM – 8:21 PM
Cloud cover
46%
4th clearest
Wind
13 km/h
6th windiest
Solar energy
7.55 kWh/m²
Travel score
7.8
out of 10

Mount Barker is city in South Australia.

Founded
1839

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 24°C in the first days to 26°C by the end.

A typical December day in Mount Barker reaches about 25°C in the afternoon and slips back to 13°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 34°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

10°20°30°40°151015202531
Avg high (°C)Avg low (°C)
12412
22412
32412
42412
52412
62412
72412
82412
92412
102512
112513
122513
132513
142513
152513
162513
172513
182513
192513
202613
212613
222613
232613
242613
252613
262613
272614
282614
292614
302614
312714

Mount Barker weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 14°213.514.17.8
Feb27° / 15°182.813.38.0
Mar24° / 13°183.412.38.1
Apr21° / 11°335.311.17.2
May17° / 448.410.25.5
Jun14° / 519.39.74.1
Jul13° / 5610.49.93.7
Aug14° / 5610.810.74.2
Sep17° / 559.711.85.5
Oct20° / 366.812.96.8
Nov23° / 11°34613.87.5
Dec25° / 13°295.314.37.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% 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 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35842
45941
55842
65842
75842
85743
95743
105743
115743
125743
135743
145743
155842
165842
175842
185842
195941
205941
216040
226139
236238
246436
256535
266535
276634
286733
296832
306832
317030

Chance of precipitation in December

Any precipitation

Mount Barker gets around 29 mm of rain over 5.3 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 17% and peaks near 21% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
121
221
321
421
520
620
720
820
919
1019
1119
1218
1318
1418
1518
1617
1717
1817
1916
2016
2116
2215
2315
2414
2514
2613
2713
2813
2912
3012
3112

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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
190910
290910
390910
490910
590910
690910
790910
8891010
9891010
10891010
11891010
12881020
13881020
14881020
15871030
16871030
17871030
1888930
1988930
2088930
2188930
2288930
2388930
2488930
2588930
2688930
2789920
2889920
2989920
3088921
3188921

Wind in December

Winds average 13 km/h in December.

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

05101520151015202531
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
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 12 min at the start of December to 14 h 18 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 5:59 AM to 6:08 AM, and sunset from 8:10 PM to 8:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:598:10
214.25:598:11
314.25:588:12
414.25:588:12
514.25:588:13
614.35:588:14
714.35:598:15
814.35:598:16
914.35:598:16
1014.35:598:17
1114.35:598:18
1214.35:598:19
1314.35:598:19
1414.36:008:20
1514.36:008:21
1614.36:008:21
1714.46:018:22
1814.46:018:22
1914.46:018:23
2014.46:028:23
2114.46:028:24
2214.46:038:24
2314.46:038:25
2414.46:048:25
2514.46:048:26
2614.46:058:26
2714.46:058:26
2814.36:068:27
2914.36:068:27
3014.36:078:27
3114.36:088:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.55 kWh/m².

For context, solar energy here swings from a low near 2.21 kWh/m² to a high of 7.84 kWh/m² in January across the year — December's 7.55 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.4Intense
27.4Intense
37.4Intense
47.4Intense
57.4Intense
67.4Intense
77.4Intense
87.4Intense
97.4Intense
107.4Intense
117.5Intense
127.5Intense
137.5Intense
147.5Intense
157.5Intense
167.5Intense
177.5Intense
187.6Intense
197.6Intense
207.7Intense
217.7Intense
227.7Intense
237.8Intense
247.8Intense
257.9Intense
268.0Intense
278.0Intense
288.0Intense
298.1Intense
308.1Intense
318.1Intense
Planning a trip in December

Hazard calendar for Mount Barker

In seasonPeak

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

Mount Barker sits in the South Indian Ocean cyclone belt; the season peaks January–March.

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

Is December a good time to visit Mount Barker?

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

7.8
Sightseeing
3rd-best month of the year
7.1
Beach & pool
3rd-best month of the year

December is one of the better times to visit Mount Barker for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mount Barker in December

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

In December, Mount Barker sees daytime highs around 25°C and nights near 13°C. Pack sun protection. Worth having: light clothes. About 5 days see rain.

sun protectionlight clothes

Sea temperature near Mount Barker in December

The nearest coast averages about 19°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 45 km away) is warmest in February at about 21°C and coldest in August near 13°C.

It's comfortable for a long swim from Jan 3 to Mar 30 — about 2.9 months when the water holds above 20°C.

15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb21Refreshing
Mar21Refreshing
Apr19Cool
May17Cool
Jun15Cool
Jul14Bracing
Aug13Bracing
Sep14Bracing
Oct15Cool
Nov17Cool
Dec19Cool

UV index in Mount Barker in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mount Barker peaks around January 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 10UV 13Jun 20UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar9Very high
Apr5High
May3Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov10Extreme
Dec13Extreme
Location & terrain

Where is Mount Barker?

Mount Barker sits at 35.1°S, 138.9°E, 322 m above sea level, in Australia. The nearest listed city is Adelaide Hills, 23 km away.

Whyalla

Topography around Mount Barker

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

Within 3 km, the terrain around Mount Barker has only modest variations in elevation — a maximum elevation change of 154 m around an average of 352 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 551 m; within 80 km, large variations in elevation — a maximum elevation change of 700 m.

The land around Mount Barker is covered by trees (42%), grassland (30%) and artificial surfaces (24%) within 3 km, grassland (59%) and trees (35%) within 16 km, and grassland (33%), water (29%) and cropland (22%) within 80 km.

3 km
154 m
16 km
551 m
80 km
700 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Adelaide Hills 23 km · Adelaide city centre 28 km · Adelaide 29 km · Morphett Vale 33 km · Parafield Gardens 39 km · Paralowie 42 km · Gawler 53 km · Whyalla 256 km

Australia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 90% of US
price level, 2025
GDP per capita
$65,130
2025
Happiness
6.9 / 10
World Happiness, 2025
Homicide rate
0.9
per 100k, 2023
Road deaths
4.9
per 100k/yr, 2019
Income group
High
World Bank
Religion
none 38%Roman Catholic 20%Protestant 18%other Christian 4%

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 Mount Barker (-35.0667°, 138.8667°, elevation 322 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).