Sīmīn Shahr weather in December

In December, Sīmīn Shahr sees average daytime highs of 14°C and overnight lows near 7°C, with 54 mm of precipitation across 7.9 wet days and about 9.5 hours of daylight. It is the 10th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 13°C by the end. The sky is clear or mostly clear about 45% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 36 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Sīmīn Shahr's 8th-clearest and 10th-windiest month. For the whole year in context, see Sīmīn Shahr's year-round climate.

Daytime high
14°
10th warmest
Overnight low
3rd coldest
Precipitation
54 mm
7.9 wet days
Daylight
9 h 30 min
7:05 AM – 4:33 PM
Cloud cover
47%
8th clearest
Wind
6 km/h
10th windiest
Solar energy
2.25 kWh/m²
Travel score
4.5
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 15°C in the first days to 13°C by the end.

A typical December day in Sīmīn Shahr reaches about 14°C in the afternoon and slips back to 7°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 19°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1168
2158
3158
4158
5158
6158
7158
8158
9157
10147
11147
12147
13147
14147
15147
16147
17147
18147
19147
20147
21147
22147
23147
24146
25146
26146
27146
28146
29146
30136
31136

How December really feels in Sīmīn Shahr

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 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
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sīmīn Shahr weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan13° / 618.70.29.73.7
Feb13° / 658.90.810.64.0
Mar17° / 669.6011.75.5
Apr21° / 14°457.2012.97.1
May26° / 18°284.70147.5
Jun30° / 23°163.2014.56.0
Jul32° / 25°184.5014.34.7
Aug33° / 26°153.4013.44.4
Sep30° / 22°345.2012.35.9
Oct25° / 17°545.50117.9
Nov19° / 11°748.40.2106.4
Dec14° / 547.90.29.54.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25644
35644
45644
55644
65545
75545
85644
95545
105545
115644
125644
135743
145743
155842
165842
175941
185941
196040
206139
216139
226238
236337
246337
256436
266436
276535
286436
296436
306436
316337

Chance of precipitation in December

Any precipitation

Sīmīn Shahr gets around 54 mm of rain and snow over 7.9 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 26% and peaks near 31% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
330
430
530
630
730
829
929
1029
1129
1228
1328
1428
1527
1627
1726
1826
1925
2025
2124
2223
2323
2422
2522
2621
2721
2821
2922
3022
3122

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 (%)Comfortable (%)
1991
2991
3991
4991
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 6 km/h in December.

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 36 min at the start of December to 9 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:53 AM to 7:11 AM, and sunset from 4:32 PM to 4:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.66:534:32
29.66:544:32
39.66:554:32
49.66:564:32
59.66:574:32
69.66:584:32
79.66:594:32
89.56:594:32
99.57:004:32
109.57:014:32
119.57:024:32
129.57:024:32
139.57:034:33
149.57:044:33
159.57:044:33
169.57:054:33
179.57:064:34
189.57:064:34
199.57:074:34
209.57:074:35
219.57:084:35
229.57:084:36
239.57:094:36
249.57:094:37
259.57:104:37
269.57:104:38
279.57:104:38
289.57:114:39
299.57:114:40
309.57:114:40
319.57:114:41

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.25 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 6.51 kWh/m² in June across the year — December's 2.25 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.2Moderate
132.2Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.2Moderate
192.2Moderate
202.3Moderate
212.3Moderate
222.3Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.3Moderate
272.3Moderate
282.3Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in December

Is December a good time to visit Sīmīn Shahr?

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

4.5
Sightseeing
9th-best month of the year
0.1
Beach & pool
10th-best month of the year

December is a reasonable time to visit Sīmīn Shahr for sightseeing.

What to pack for Sīmīn Shahr in December

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

In December, Sīmīn Shahr sees daytime highs around 14°C and nights near 7°C. Worth packing: a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Sīmīn Shahr in December

The nearest coast averages about 15°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 34 km away) is warmest in August at about 29°C and coldest in February near 11°C.

It's comfortable for a long swim from May 13 to Nov 6 — about 5.9 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar12Bracing
Apr16Cool
May21Refreshing
Jun25Warm
Jul28Warm
Aug29Tropical
Sep27Warm
Oct23Refreshing
Nov19Cool
Dec15Bracing

UV index in Sīmīn Shahr 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 Sīmīn Shahr peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 18UV 10Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May7Very high
Jun8Very high
Jul10Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Moderate

Air quality in Sīmīn Shahr 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 Sīmīn Shahr is worst in September — around 29 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 2029 µg/m³Jul 1519 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb23Moderate
Mar25Moderate
Apr25Moderate
May22Moderate
Jun21Moderate
Jul19Moderate
Aug22Moderate
Sep29Moderate
Oct27Moderate
Nov25Moderate
Dec23Moderate
Location & terrain

Where is Sīmīn Shahr?

Sīmīn Shahr sits at 37.0°N, 54.2°E, -18 m above sea level, in Iran. The nearest listed city is Gomīshān, 15 km away.

Topography around Sīmīn Shahr

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

Within 3 km, the terrain around Sīmīn Shahr has only modest variations in elevation — a maximum elevation change of 6 m around an average of -21 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 21 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,905 m.

The land around Sīmīn Shahr is covered by cropland (76%) within 3 km, cropland (87%) within 16 km, and bare terrain (24%), cropland (22%) and water (21%) within 80 km.

3 km
6 m
16 km
21 m
80 km
3,905 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Gomīshān 15 km · Bandar-e Torkaman 19 km · Āq Qalā 20 km · Kord Kūy 27 km · Gorgān 27 km · Bandar-e Gaz 37 km · Fāẕelābād 48 km · Galūgāh 49 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 Sīmīn Shahr (37.0142°, 54.23°, elevation -18 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).