Tehran weather in December

In December, Tehran sees average daytime highs of 4°C and overnight lows near -5°C, with 43 mm of precipitation across 7.7 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 6°C in the first days to 3°C by the end. The sky is clear or mostly clear about 54% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 48 min at the start of December to 9 h 36 min by month's end. Set against the rest of the year, December is Tehran's 10th-clearest and 10th-windiest month. For the whole year in context, see Tehran's year-round climate.

Daytime high
10th warmest
Overnight low
-5°
3rd coldest
Precipitation
43 mm
7.7 wet days
Daylight
9 h 36 min
7:13 AM – 4:48 PM
Cloud cover
41%
10th clearest
Wind
5 km/h
10th windiest
Solar energy
2.9 kWh/m²
Travel score
0.0
out of 10

Tehran is capital city of Iran.

Air quality
High
PM2.5 31.4 µg/m³ · 2020
Density
10,428/km²
people per km²
Founded
1794

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 6°C in the first days to 3°C by the end.

A typical December day in Tehran reaches about 4°C in the afternoon and slips back to -5°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between -1°C and 9°C. Set against its neighbours, December runs about 6°C cooler than November and about 3°C warmer than January.

-10°10°151015202531
Avg high (°C)Avg low (°C)
16-3
26-3
36-3
45-3
55-3
65-4
75-4
85-4
95-4
104-4
114-4
124-5
134-5
144-5
154-5
164-5
174-5
184-5
194-5
203-5
213-5
223-6
233-6
243-6
253-6
263-6
273-6
283-6
293-6
303-6
313-6

How December really feels in Tehran

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
wind chill below the day's low

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

Tehran weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°427.66.79.90.0
Feb / -6°488.46.810.60.0
Mar / -0°629.55.511.71.6
Apr15° / 519.51.112.94.8
May22° / 13°224.90.113.97.7
Jun28° / 18°61.6014.47.7
Jul31° / 22°51.2014.25.9
Aug30° / 21°40.8013.36.7
Sep26° / 16°50.9012.29.0
Oct19° / 10°214.10.111.17.3
Nov10° / 447.1310.12.5
Dec / -5°437.75.99.60.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 33%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16436
26436
36238
46238
56238
66139
76139
86139
96139
106139
116238
126337
136436
146535
156535
166733
176733
186832
196931
207030
217030
227129
237228
247228
257228
267228
277228
287228
297228
307228
317129

Chance of precipitation in December

Any precipitationSnow

Tehran gets around 43 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 28% on the wettest days, and about 6 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12619
22620
32620
42621
52721
62722
72722
82722
92722
102822
112821
122721
132721
142720
152720
162719
172619
182618
192518
202517
212417
222316
232316
242216
252215
262115
272115
282115
292116
302116
312217

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 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 48 min at the start of December to 9 h 36 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 7:01 AM to 7:19 AM, and sunset from 4:47 PM to 4:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.87:014:47
29.77:024:47
39.77:034:47
49.77:044:47
59.77:054:47
69.77:054:47
79.77:064:47
89.77:074:47
99.67:084:47
109.67:094:47
119.67:094:47
129.67:104:47
139.67:114:48
149.67:114:48
159.67:124:48
169.67:134:48
179.67:134:49
189.67:144:49
199.67:144:49
209.67:154:50
219.67:154:50
229.67:164:51
239.67:164:51
249.67:174:52
259.67:174:52
269.67:184:53
279.67:184:53
289.67:184:54
299.67:194:55
309.67:194:55
319.67:194:56

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.9 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.9 kWh/m² to a high of 7.69 kWh/m² in June across the year — December's 2.9 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
12.9Moderate
22.9Moderate
32.9Moderate
42.9Moderate
52.9Moderate
62.9Moderate
72.9Moderate
82.9Moderate
92.9Moderate
102.9Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in December

Is December a good time to visit Tehran?

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

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Tehran.

What to pack for Tehran in December

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

In December, Tehran sees daytime highs around 4°C and nights near -5°C. Pack a warm layer and a heavy coat. About 8 days see rain.

a warm layera heavy coat

UV index in Tehran in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tehran peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJul 17UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May9Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep7Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Tehran 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 Tehran is worst in January — around 47 µg/m³ PM2.5 (poor), about 3.1× the cleanest month (July, 15 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Tehran's WHO annual average of 31.4 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 1247 µg/m³Jul 1816 µg/m³
PM2.5 (µg/m³)Level
Jan47Poor
Feb43Poor
Mar35Poor
Apr31Moderate
May26Moderate
Jun20Moderate
Jul15Moderate
Aug18Moderate
Sep24Moderate
Oct32Moderate
Nov38Poor
Dec46Poor
Location & terrain

Where is Tehran?

Tehran sits at 35.7°N, 51.4°E, 1,178 m above sea level, in Iran. The nearest listed city is Vaḩīdīyeh, 5.0 km away.

Topography around Tehran

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

Within 3 km, the terrain around Tehran has only modest variations in elevation — a maximum elevation change of 152 m around an average of 1,186 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,728 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,034 m.

The land around Tehran is covered by artificial surfaces (96%) within 3 km, artificial surfaces (60%) within 16 km, and bare terrain (38%) and grassland (37%) within 80 km.

3 km
152 m
16 km
1,728 m
80 km
5,034 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Vaḩīdīyeh 5.0 km · Shahrak-e Qods 8.0 km · Morteẕá Gerd 12 km · Tajrīsh 12 km · Shahrak-e ‘Alā’īn 13 km · Andīsheh 14 km · Chahār Dangeh 14 km · Bāqershahr 18 km

Iran travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 352% of US
price level, 2025
GDP per capita
$3,924
2025
Happiness
5.2 / 10
World Happiness, 2025
Safe drinking water
94%
of population, 2024
Homicide rate
2.4
per 100k, 2014
Road deaths
21.5
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 492
Religion
Muslim 99%Christian 1%Baha'i 0%agnostic 0%

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 Tehran (35.6944°, 51.4215°, elevation 1,178 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).