Aosta weather in December

In December, Aosta sees average daytime highs of -5°C and overnight lows near -11°C, with 110 mm of precipitation across 12.7 wet days and about 8.5 hours of daylight. It is the 11th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about -4°C in the first days to -6°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 8 h 42 min at the start of December to 8 h 30 min by month's end. Set against the rest of the year, December is Aosta's 9th-clearest and 6th-windiest month. For the whole year in context, see Aosta's year-round climate.

Daytime high
-5°
11th warmest
Overnight low
-11°
3rd coldest
Precipitation
110 mm
12.7 wet days
Daylight
8 h 30 min
8:12 AM – 4:42 PM
Cloud cover
61%
9th clearest
Wind
4 km/h
6th windiest
Solar energy
1.55 kWh/m²
Travel score
0.0
out of 10
Air quality
Moderate
PM2.5 10.5 µg/m³ · 2019

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about -4°C in the first days to -6°C by the end.

A typical December day in Aosta reaches about -5°C in the afternoon and slips back to -11°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between -10°C and -0°C. Set against its neighbours, December runs about 5°C cooler than November and about 1°C warmer than January.

-20°-15°-10°-5°151015202531
Avg high (°C)Avg low (°C)
1-3-10
2-4-10
3-4-10
4-4-11
5-4-11
6-4-11
7-4-11
8-4-11
9-5-11
10-5-11
11-5-11
12-5-11
13-5-11
14-5-11
15-5-12
16-5-12
17-5-12
18-5-12
19-5-12
20-5-12
21-5-12
22-5-12
23-5-12
24-5-12
25-6-12
26-6-12
27-6-12
28-6-12
29-6-12
30-6-12
31-6-12

How December really feels in Aosta

Once humidity and wind are folded in, December 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
31 feel bitter (≤ -10°C)

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Aosta weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-6° / -12°10011.912.88.90.0
Feb-4° / -12°7910.91210.10.0
Mar / -8°881213.211.60.0
Apr / -4°971313.313.30.0
May / 11216.38.214.71.1
Jun13° / 10516.72.315.43.3
Jul16° / 9515.70.815.14.6
Aug16° / 8713.90.713.94.6
Sep12° / 8912.72.912.32.9
Oct / -1°9812.47.910.70.7
Nov-0° / -7°12413.313.69.30.0
Dec-5° / -11°11012.713.68.50.0

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 11% of December, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24060
34060
44060
54159
64159
74159
84159
94258
104159
114258
124258
134258
144258
154258
164159
174159
184159
194159
204258
214258
224159
234159
244159
254258
264258
274357
284357
294357
304357
314456

Chance of precipitation in December

Any precipitationSnow

Aosta gets around 110 mm of rain and snow over 12.7 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 41% and peaks near 42% on the wettest days, and about 14 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
14143
24143
34143
44144
54144
64244
74244
84244
94245
104245
114245
124245
134245
144245
154245
164245
174144
184144
194144
204144
214144
224044
234044
244044
254044
264044
274044
284144
294145
304145
314145

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 4 km/h in December.

Across December, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 42 min at the start of December to 8 h 30 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 7:58 AM to 8:18 AM, and sunset from 4:43 PM to 4:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.77:584:43
28.77:594:43
38.78:004:42
48.78:014:42
58.78:024:42
68.68:034:42
78.68:044:41
88.68:054:41
98.68:064:41
108.68:074:41
118.68:084:41
128.58:094:41
138.58:104:41
148.58:104:42
158.58:114:42
168.58:124:42
178.58:134:42
188.58:134:42
198.58:144:43
208.58:144:43
218.58:154:44
228.58:154:44
238.58:164:45
248.58:164:45
258.58:174:46
268.58:174:46
278.58:174:47
288.58:174:48
298.58:184:48
308.58:184:49
318.58:184:50

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.55 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.55 kWh/m² to a high of 6.01 kWh/m² in June across the year — December's 1.55 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.7Dim
21.7Dim
31.7Dim
41.6Dim
51.6Dim
61.6Dim
71.6Dim
81.6Dim
91.6Dim
101.6Dim
111.6Dim
121.6Dim
131.6Dim
141.6Dim
151.6Dim
161.5Dim
171.5Dim
181.5Dim
191.5Dim
201.5Dim
211.5Dim
221.5Dim
231.5Dim
241.5Dim
251.5Dim
261.6Dim
271.6Dim
281.6Dim
291.6Dim
301.6Dim
311.6Dim
Planning a trip in December

Is December a good time to visit Aosta?

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

0.0
Sightseeing
7th-best month of the year
Beach & pool
never really warm enough

December is a weaker month for outdoor sightseeing in Aosta.

What to pack for Aosta in December

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

In December, Aosta sees daytime highs around -5°C and nights near -11°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 13 days see rain.

a warm layera heavy coatrain gear

UV index in Aosta in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aosta peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 15UV 10Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr8Very high
May9Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Aosta?

Aosta sits at 45.7°N, 7.3°E, 583 m above sea level, in Italy. The nearest listed city is Chamonix, 40 km away.

Topography around Aosta

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

Within 3 km, the terrain around Aosta has large variations in elevation — a maximum elevation change of 983 m around an average of 764 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,150 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,625 m.

The land around Aosta is covered by trees (48%), grassland (27%) and artificial surfaces (23%) within 3 km, trees (48%) and grassland (35%) within 16 km, and trees (42%) and grassland (32%) within 80 km.

3 km
983 m
16 km
3,150 m
80 km
4,625 m
treesgrasslandcroplandartificial surfacesbare terrainsnow and icewatermoss and lichen
December weather nearby: Chamonix 40 km · Martigny-Ville 45 km · Zermatt 46 km · Ivrea 53 km · Sitten 55 km · Sallanches 58 km · Ciriè 60 km · Biella 61 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%other 1%

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 Aosta (45.7376°, 7.3172°, elevation 583 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).