Sunbury weather in December

In December, Sunbury sees average daytime highs of 23°C and overnight lows near 10°C, with 61 mm of rain across 7.7 wet days and about 14.5 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 24°C by the end. The sky is clear or mostly clear about 31% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 24 min at the start of December to 14 h 36 min by month's end. Set against the rest of the year, December is Sunbury's 4th-clearest and 8th-windiest month. For the whole year in context, see Sunbury's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
10°
9th coldest
Rainfall
61 mm
7.7 wet days
Daylight
14 h 36 min
6:00 AM – 8:35 PM
Cloud cover
57%
4th clearest
Wind
13 km/h
8th windiest
Solar energy
7.01 kWh/m²
Travel score
7.2
out of 10

Sunbury is town in Victoria, Australia.

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 22°C in the first days to 24°C by the end.

A typical December day in Sunbury reaches about 23°C in the afternoon and slips back to 10°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 31°C. Set against its neighbours, December runs about 2°C warmer than November and about 2°C cooler than January.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1229
2229
3229
42210
52210
62210
72210
82210
92210
102210
112310
122310
132310
142310
152310
162310
172310
182310
192310
202310
212310
222310
232310
242411
252411
262411
272411
282411
292411
302411
312411

Sunbury weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 12°536.514.37.6
Feb25° / 12°476.113.47.6
Mar22° / 11°335.312.37.5
Apr18° / 416.411.16.4
May15° / 387.6104.5
Jun12° / 4699.53.1
Jul11° / 389.19.72.8
Aug12° / 4910.110.63.3
Sep15° / 5610.511.74.4
Oct18° / 629.5135.8
Nov21° / 648.9146.5
Dec23° / 10°617.714.57.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34456
44456
54456
64456
74456
84456
94456
104555
114555
124555
134555
144555
154654
164654
174654
184555
194654
204654
214654
224753
234753
244852
254951
264951
275050
285149
295149
305149
315149

Chance of precipitation in December

Any precipitation

Sunbury gets around 61 mm of rain over 7.7 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 25% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
129
228
328
428
528
628
727
827
927
1027
1126
1226
1326
1426
1525
1625
1725
1825
1925
2024
2124
2224
2323
2423
2523
2622
2722
2822
2922
3022
3121

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 88% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
18992
28992
38992
48992
58983
68983
78983
88983
99082
109082
119082
128983
138893
148893
158893
168893
178893
188893
198893
208893
218893
228794
238794
248794
2586104
2686104
2786104
2885114
2985114
3084124
3183134

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 24 min at the start of December to 14 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 5:59 AM to 6:07 AM, and sunset from 8:23 PM to 8:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:598:23
214.45:598:24
314.45:588:25
414.55:588:26
514.55:588:27
614.55:588:27
714.55:588:28
814.55:588:29
914.55:588:30
1014.55:598:31
1114.55:598:31
1214.65:598:32
1314.65:598:33
1414.65:598:33
1514.65:598:34
1614.66:008:35
1714.66:008:35
1814.66:008:36
1914.66:018:36
2014.66:018:37
2114.66:028:38
2214.66:028:38
2314.66:038:38
2414.66:038:39
2514.66:048:39
2614.66:048:40
2714.66:058:40
2814.66:058:40
2914.66:068:41
3014.66:078:41
3114.66:078:41

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.01 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 7.23 kWh/m² in January across the year — December's 7.01 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.8Intense
36.8Intense
46.8Intense
56.8Intense
66.8Intense
76.8Intense
86.9Intense
96.9Intense
106.9Intense
116.9Intense
127.0Intense
137.0Intense
147.0Intense
157.0Intense
167.0Intense
177.1Intense
187.1Intense
197.1Intense
207.1Intense
217.2Intense
227.2Intense
237.3Intense
247.3Intense
257.3Intense
267.4Intense
277.4Intense
287.4Intense
297.5Intense
307.5Intense
317.5Intense
Planning a trip in December

Hazard calendar for Sunbury

In seasonPeak

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

Sunbury 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 Sunbury?

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

7.2
Sightseeing
4th-best month of the year
5.5
Beach & pool
3rd-best month of the year

December is one of the better times to visit Sunbury for general sightseeing.

What to pack for Sunbury in December

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

In December, Sunbury sees daytime highs around 23°C and nights near 10°C. Pack sun protection. Worth having: light clothes. About 8 days see rain.

sun protectionlight clothes

Sea temperature near Sunbury 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 36 km away) is warmest in February at about 21°C and coldest in August near 11°C.

It's comfortable for a long swim from Jan 15 to Mar 11 — about 1.8 months when the water holds above 20°C.

10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan20Refreshing
Feb21Refreshing
Mar20Cool
Apr18Cool
May15Cool
Jun13Bracing
Jul12Bracing
Aug11Bracing
Sep12Bracing
Oct14Bracing
Nov17Cool
Dec19Cool

UV index in Sunbury 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 Sunbury peaks around December 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateModerateVery highExtremeDec 19UV 12Jun 17UV 2
UV index (midday)Level
Jan11Extreme
Feb10Extreme
Mar8Very high
Apr5Moderate
May3Moderate
Jun2Low
Jul2Moderate
Aug3Moderate
Sep5Moderate
Oct8Very high
Nov10Very high
Dec13Extreme
Location & terrain

Where is Sunbury?

Sunbury sits at 37.6°S, 144.7°E, 220 m above sea level, in Australia. The nearest listed city is Hillside, 13 km away.

Topography around Sunbury

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

Within 3 km, the terrain around Sunbury has only modest variations in elevation — a maximum elevation change of 236 m around an average of 234 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 609 m; within 80 km, large variations in elevation — a maximum elevation change of 1,151 m.

The land around Sunbury is covered by artificial surfaces (37%), grassland (34%) and trees (26%) within 3 km, grassland (70%) within 16 km, and grassland (46%) and trees (32%) within 80 km.

3 km
236 m
16 km
609 m
80 km
1,151 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Hillside 13 km · Greenvale 14 km · Taylors Lakes 14 km · Taylors Hill 15 km · Caroline Springs 18 km · Roxburgh Park 18 km · Saint Albans 19 km · St Albans 20 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 Sunbury (-37.5774°, 144.7261°, elevation 220 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).