Ölgii weather in December

In December, Ölgii sees average daytime highs of -15°C and overnight lows near -25°C, with 1 mm of precipitation across 0.2 wet days and about 8.1 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about -13°C in the first days to -16°C by the end. The sky is clear or mostly clear about 53% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 18 min at the start of December to 8 h 06 min by month's end. Set against the rest of the year, December is Ölgii's 3rd-clearest and 11th-windiest month. For the whole year in context, see Ölgii's year-round climate.

Daytime high
-15°
11th warmest
Overnight low
-25°
2nd coldest
Precipitation
1 mm
0.2 wet days
Daylight
8 hours
8:55 AM – 4:58 PM
Cloud cover
41%
3rd clearest
Wind
7 km/h
11th windiest
Solar energy
1.43 kWh/m²
Travel score
0.0
out of 10

Ölgii is capital-city of the Bayan-Ölgii aimag in Mongolia.

Density
1,893/km²
people per km²
Founded
1940

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 -13°C in the first days to -16°C by the end.

A typical December day in Ölgii reaches about -15°C in the afternoon and slips back to -25°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between -21°C and -10°C. Set against its neighbours, December runs about 8°C cooler than November and on par with January.

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

How December really feels in Ölgii

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.

Ölgii weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-16° / -28°00.10.28.50.0
Feb-11° / -24°10.50.69.80.0
Mar-3° / -16°61.72.111.60.0
Apr / -5°123.62.713.41.1
May13° / 245.22.2154.3
Jun19° / 378.30.515.96.2
Jul21° / 10°469.7015.66.5
Aug19° / 337.10.114.26.6
Sep13° / 123.51.212.44.1
Oct / -8°51.81.610.50.4
Nov-7° / -18°311.38.90.0
Dec-15° / -25°10.20.48.10.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 31%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26832
36733
46733
56832
66832
76832
86931
96931
107030
117129
127129
137129
147129
157129
167129
177030
187030
197030
206931
216931
226931
236832
246832
256832
266832
276832
286832
296931
306931
316931

Chance of precipitation in December

Any precipitationSnow

Ölgii gets around 1 mm of rain and snow over 0.2 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 1% and peaks near 2% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
122
222
322
422
522
612
712
812
912
1011
1111
1212
1312
1412
1512
1612
1712
1812
1912
2011
2111
2211
2311
2411
2501
2601
2701
2801
2900
3000
3100

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 7 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
146calm
156calm
166calm
176calm
186calm
196calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 18 min at the start of December to 8 h 06 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 8:40 AM to 9:01 AM, and sunset from 5:00 PM to 5:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.38:405:00
28.38:414:59
38.38:434:59
48.28:444:58
58.28:454:58
68.28:464:58
78.28:474:58
88.28:484:57
98.18:494:57
108.18:504:57
118.18:514:57
128.18:524:57
138.18:534:57
148.18:544:57
158.18:544:57
168.08:554:58
178.08:564:58
188.08:564:58
198.08:574:58
208.08:584:59
218.08:584:59
228.08:595:00
238.08:595:00
248.09:005:01
258.09:005:01
268.09:005:02
278.09:005:02
288.09:015:03
298.19:015:04
308.19:015:05
318.19:015:06

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.43 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.43 kWh/m² to a high of 7.1 kWh/m² in June across the year — December's 1.43 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.6Dim
21.6Dim
31.5Dim
41.5Dim
51.5Dim
61.5Dim
71.5Dim
81.5Dim
91.5Dim
101.5Dim
111.4Dim
121.4Dim
131.4Dim
141.4Dim
151.4Dim
161.4Dim
171.4Dim
181.4Dim
191.4Dim
201.4Dim
211.4Dim
221.4Dim
231.4Dim
241.4Dim
251.4Dim
261.4Dim
271.4Dim
281.4Dim
291.4Dim
301.4Dim
311.5Dim
Planning a trip in December

Is December a good time to visit Ölgii?

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 Ölgii.

What to pack for Ölgii in December

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

In December, Ölgii sees daytime highs around -15°C and nights near -25°C. Pack a warm layer and a heavy coat.

a warm layera heavy coat

UV index in Ölgii in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ölgii peaks around July 17 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highModerateLowJul 17UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr6High
May9Very high
Jun8Very high
Jul9Very high
Aug8Very high
Sep5Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Ölgii?

Ölgii sits at 49.0°N, 90.0°E, 1,715 m above sea level, in Mongolia. The nearest listed city is Khovd, 164 km away.

KhovdUlaangomAbazaGorno-AltayskKyzylMayma

Topography around Ölgii

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

Within 3 km, the terrain around Ölgii has significant variations in elevation — a maximum elevation change of 304 m around an average of 1,734 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,132 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,848 m.

The land around Ölgii is covered by bare terrain (53%) and grassland (30%) within 3 km, grassland (75%) and bare terrain (23%) within 16 km, and grassland (65%) and bare terrain (25%) within 80 km.

3 km
304 m
16 km
1,132 m
80 km
2,848 m
grasslandartificial surfacesbare terrainwaterwetlandmoss and lichen
December weather nearby: Khovd 164 km · Ulaangom 189 km · Abaza 410 km · Zaysan 412 km · Altay 422 km · Gorno-Altaysk 439 km · Kyzyl 440 km · Mayma 443 km

Mongolia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E / F
220 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$7,108
2025
Happiness
5.9 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
5.9
per 100k, 2023
Road deaths
21
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 447
Religion
Buddhist 52%no religion 41%Muslim 3%Shaman 3%

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 Ölgii (48.9683°, 89.9625°, elevation 1,715 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).