Shahrīār weather in December

In December, Shahrīār sees average daytime highs of 8°C and overnight lows near -1°C, with 37 mm of precipitation across 7 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 9°C in the first days to 7°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 Shahrīār's 10th-clearest and 12th-windiest month. For the whole year in context, see Shahrīār's year-round climate.

Daytime high
10th warmest
Overnight low
-1°
3rd coldest
Precipitation
37 mm
7 wet days
Daylight
9 h 36 min
7:14 AM – 4:50 PM
Cloud cover
40%
10th clearest
Wind
6 km/h
12th windiest
Solar energy
2.74 kWh/m²
Travel score
1.3
out of 10

Shahrīār is city in Tehran Province, Iran.

Founded
1367

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 9°C in the first days to 7°C by the end.

A typical December day in Shahrīār reaches about 8°C in the afternoon and slips back to -1°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 3°C and 12°C. Set against its neighbours, December runs about 6°C cooler than November and about 2°C warmer than January.

-10°-5°10°15°151015202531
Avg high (°C)Avg low (°C)
190
290
390
490
590
680
780
88-1
98-1
108-1
118-1
128-1
138-1
148-1
157-1
167-2
177-2
187-2
197-2
207-2
217-2
227-2
237-2
247-2
257-2
267-2
277-2
287-2
297-3
307-3
317-3

How December really feels in Shahrīār

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.

Shahrīār weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°377.14.39.90.2
Feb / -2°397.73.510.71.2
Mar13° / 4891.311.73.7
Apr19° / 427.60.312.96.5
May26° / 14°153.5013.97.9
Jun32° / 19°30.7014.45.3
Jul35° / 22°10.3014.23.4
Aug34° / 21°20.2013.34.2
Sep29° / 16°20.4012.27.3
Oct22° / 10°142.8011.18.4
Nov13° / 356.10.710.14.2
Dec / -1°3772.69.61.3

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 32%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26535
36535
46436
56436
66436
76337
86337
96436
106436
116436
126436
136634
146634
156634
166733
176832
186832
196931
207030
217030
227030
237129
247228
257228
267228
277129
287129
297129
307129
317129

Chance of precipitation in December

Any precipitationSnow

Shahrīār gets around 37 mm of rain and snow over 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 22% and peaks near 25% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1235
2246
3246
4246
5247
6257
7258
8258
9258
10259
11259
12259
13259
14249
15249
16249
17239
18239
19229
20229
21219
22219
23209
24209
25199
26199
27199
28199
29199
301910
312010

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 6 km/h in December, the calmest month.

Across December, daily wind ranges from about 6 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
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 7:03 AM to 7:20 AM, and sunset from 4:48 PM to 4:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.87:034:48
29.77:044:48
39.77:044:48
49.77:054:48
59.77:064:48
69.77:074:48
79.77:084:48
89.77:084:48
99.77:094:48
109.67:104:48
119.67:114:49
129.67:114:49
139.67:124:49
149.67:134:49
159.67:134:50
169.67:144:50
179.67:154:50
189.67:154:51
199.67:164:51
209.67:164:51
219.67:174:52
229.67:174:52
239.67:184:53
249.67:184:53
259.67:194:54
269.67:194:54
279.67:194:55
289.67:204:56
299.67:204:56
309.67:204:57
319.67:204:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.74 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.74 kWh/m² to a high of 7.89 kWh/m² in June across the year — December's 2.74 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.8Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.7Moderate
62.7Moderate
72.7Moderate
82.7Moderate
92.7Moderate
102.7Moderate
112.7Moderate
122.7Moderate
132.7Moderate
142.7Moderate
152.7Moderate
162.7Moderate
172.7Moderate
182.7Moderate
192.8Moderate
202.8Moderate
212.8Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.8Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in December

Is December a good time to visit Shahrīār?

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

1.3
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Shahrīār.

What to pack for Shahrīār in December

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

In December, Shahrīār sees daytime highs around 8°C and nights near -1°C. Pack a warm layer. Worth having: a heavy coat. About 7 days see rain.

a warm layera heavy coat

UV index in Shahrīār 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 Shahrīār peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 16UV 10Jan 1UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May9Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep7Very high
Oct5High
Nov3Moderate
Dec3Moderate

Air quality in Shahrīār 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 Shahrīār is worst in December — around 170 µg/m³ PM2.5 (very unhealthy), about 3.3× the cleanest month (July, 51 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyDec 23169 µg/m³Jul 1852 µg/m³
PM2.5 (µg/m³)Level
Jan167Very unhealthy
Feb149Unhealthy
Mar116Unhealthy
Apr104Unhealthy
May85Unhealthy
Jun61Unhealthy
Jul51Poor
Aug58Unhealthy
Sep74Unhealthy
Oct102Unhealthy
Nov135Unhealthy
Dec170Very unhealthy
Location & terrain

Where is Shahrīār?

Shahrīār sits at 35.7°N, 51.1°E, 1,159 m above sea level, in Iran. The nearest listed city is Shahre Jadide Andisheh, 4.0 km away.

Topography around Shahrīār

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

Within 3 km, the terrain around Shahrīār has only modest variations in elevation — a maximum elevation change of 62 m around an average of 1,151 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,499 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,020 m.

The land around Shahrīār is covered by trees (46%) and artificial surfaces (38%) within 3 km, artificial surfaces (31%) and bare terrain (24%) within 16 km, and bare terrain (42%) and grassland (31%) within 80 km.

3 km
62 m
16 km
1,499 m
80 km
4,020 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Shahre Jadide Andisheh 4.0 km · Ferdowsīyeh 6.0 km · Bāghestān 7.0 km · Malārd 7.0 km · Qods 8.0 km · Shāhedshahr 10 km · Garmdarreh 10 km · Şabbāshahr 10 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 Shahrīār (35.6588°, 51.0577°, elevation 1,159 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).