Ust’-Ilimsk weather in December

In December, Ust’-Ilimsk sees average daytime highs of -18°C and overnight lows near -25°C, with 22 mm of precipitation across 7.7 wet days and about 6.3 hours of daylight. It is the 11th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about -17°C in the first days to -19°C by the end. The sky is clear or mostly clear about 6% of the time in December, and the air most often feels dry.

Daylight stretches from about 6 h 42 min at the start of December to 6 h 12 min by month's end. Set against the rest of the year, December is Ust’-Ilimsk's 12th-clearest and 6th-windiest month. For the whole year in context, see Ust’-Ilimsk's year-round climate.

Daytime high
-18°
11th warmest
Overnight low
-25°
2nd coldest
Precipitation
22 mm
7.7 wet days
Daylight
6 h 12 min
10:00 AM – 4:11 PM
Cloud cover
87%
12th clearest
Wind
12 km/h
6th windiest
Solar energy
0.36 kWh/m²
Travel score
0.0
out of 10

Ust’-Ilimsk is city in Russia.

Density
438/km²
people per km²
Founded
1966

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 -17°C in the first days to -19°C by the end.

A typical December day in Ust’-Ilimsk reaches about -18°C in the afternoon and slips back to -25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between -32°C and -6°C. Set against its neighbours, December runs about 8°C cooler than November and about 1°C warmer than January.

-40°-30°-20°-10°151015202531
Avg high (°C)Avg low (°C)
1-16-23
2-16-24
3-17-24
4-17-24
5-17-24
6-17-24
7-17-24
8-17-25
9-18-25
10-18-25
11-18-25
12-18-25
13-18-25
14-18-25
15-18-25
16-18-25
17-17-25
18-17-25
19-17-25
20-18-25
21-18-25
22-18-25
23-18-25
24-18-25
25-18-25
26-18-25
27-18-25
28-18-25
29-19-25
30-19-26
31-19-26

How December really feels in Ust’-Ilimsk

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.

Ust’-Ilimsk weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-19° / -26°155.19.16.90.0
Feb-14° / -23°124.57.98.90.0
Mar-4° / -14°196.38.711.40.0
Apr / -6°287.86.1140.3
May13° / 4310.61.616.33.5
Jun21° / 10°5610.6017.76.3
Jul24° / 13°6010017.26.8
Aug20° / 11°579.9015.16.2
Sep12° / 52110.912.52.9
Oct / -5°4111.49.19.90.1
Nov-10° / -17°319.712.67.60.0
Dec-18° / -25°227.710.76.30.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 6% of December, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11288
21288
31288
41288
51288
61288
71288
81288
91288
101189
111189
121189
131189
141189
151090
161189
171189
181189
191189
201189
211189
221189
231189
241189
251288
261288
271387
281387
291387
301486
311486

Chance of precipitation in December

Any precipitationSnow

Ust’-Ilimsk gets around 22 mm of rain and snow 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 precipitation averages around 25% and peaks near 29% on the wettest days, and about 11 days bring snow. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
12938
22837
32837
42736
52735
62735
72735
82736
92836
102836
112837
122837
132837
142838
152838
162738
172737
182637
192637
202536
212436
222435
232335
242234
252234
262133
272133
282133
292033
302033
312033

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 12 km/h in December.

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

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 6 h 42 min at the start of December to 6 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over December. Sunrise moves from 9:40 AM to 10:05 AM, and sunset from 4:19 PM to 4:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.79:404:19
26.69:414:18
36.69:434:17
46.59:454:16
56.59:464:15
66.49:484:14
76.49:494:14
86.49:514:13
96.39:524:13
106.39:534:12
116.39:554:12
126.39:564:12
136.29:574:11
146.29:584:11
156.29:594:11
166.210:004:11
176.210:014:11
186.210:024:11
196.210:024:11
206.110:034:12
216.110:044:12
226.110:044:13
236.110:054:13
246.110:054:14
256.210:054:14
266.210:054:15
276.210:064:16
286.210:064:17
296.210:064:18
306.210:054:19
316.210:054:20

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.36 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.36 kWh/m² to a high of 5.98 kWh/m² in June across the year — December's 0.36 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.4Dim
20.4Dim
30.4Dim
40.4Dim
50.4Dim
60.4Dim
70.4Dim
80.4Dim
90.4Dim
100.4Dim
110.4Dim
120.4Dim
130.4Dim
140.3Dim
150.3Dim
160.3Dim
170.3Dim
180.3Dim
190.3Dim
200.3Dim
210.3Dim
220.3Dim
230.3Dim
240.3Dim
250.3Dim
260.3Dim
270.3Dim
280.4Dim
290.4Dim
300.4Dim
310.4Dim
Planning a trip in December

Is December a good time to visit Ust’-Ilimsk?

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

0.0
Sightseeing
8th-best month of the year
0.0
Beach & pool
6th-best month of the year

December is a weaker month for outdoor sightseeing in Ust’-Ilimsk.

What to pack for Ust’-Ilimsk in December

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

In December, Ust’-Ilimsk sees daytime highs around -18°C and nights near -25°C. Pack a warm layer and a heavy coat. About 8 days see rain.

a warm layera heavy coat

UV index in Ust’-Ilimsk in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 0. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ust’-Ilimsk peaks around June 21 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 21UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5High
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low

Air quality in Ust’-Ilimsk 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 Ust’-Ilimsk is worst in July — around 35 µg/m³ PM2.5 (moderate), about 26.7× the cleanest month (December, 1 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1934 µg/m³Dec 212 µg/m³
PM2.5 (µg/m³)Level
Jan3Good
Feb4Good
Mar5Good
Apr9Good
May10Good
Jun27Moderate
Jul35Moderate
Aug30Moderate
Sep19Moderate
Oct29Moderate
Nov7Good
Dec1Good
Location & terrain

Where is Ust’-Ilimsk?

Ust’-Ilimsk sits at 58.0°N, 102.7°E, 278 m above sea level, in Russia. The nearest listed city is Zheleznogorsk-Ilimskiy, 181 km away.

Topography around Ust’-Ilimsk

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ust’-Ilimsk.

Within 3 km, the terrain around Ust’-Ilimsk has only modest variations in elevation — a maximum elevation change of 235 m around an average of 276 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 348 m; within 80 km, large variations in elevation — a maximum elevation change of 627 m.

The land around Ust’-Ilimsk is covered by trees (65%) and water (21%) within 3 km, trees (83%) within 16 km, and trees (93%) within 80 km.

3 km
235 m
16 km
348 m
80 km
627 m
treesgrasslandartificial surfacesbare terrainwater
December weather nearby: Zheleznogorsk-Ilimskiy 181 km · Kodinsk 215 km · Bratsk 217 km · Vikhorevka 227 km · Ust’-Kut 230 km · Chunskiy 280 km · Tayshet 365 km · Tulun 403 km

Russia travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 32% of US
price level, 2025
GDP per capita
$17,547
2025
Happiness
5.8 / 10
World Happiness, 2025
Safe drinking water
76%
of population, 2024
Homicide rate
6.8
per 100k, 2021
Road deaths
12
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 521
Religion
other Christian 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 Ust’-Ilimsk (58.0006°, 102.6619°, elevation 278 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).