Mahdishahr weather in December

In December, Mahdishahr sees average daytime highs of 4°C and overnight lows near -3°C, with 23 mm of precipitation across 5.9 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 5°C in the first days to 3°C by the end. The sky is clear or mostly clear about 48% 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 Mahdishahr's 8th-clearest and 12th-windiest month. For the whole year in context, see Mahdishahr's year-round climate.

Daytime high
10th warmest
Overnight low
-3°
3rd coldest
Precipitation
23 mm
5.9 wet days
Daylight
9 h 36 min
7:05 AM – 4:41 PM
Cloud cover
45%
8th clearest
Wind
4 km/h
12th windiest
Solar energy
2.85 kWh/m²
Travel score
0.0
out of 10

Mahdishahr is city in Semnan Province, Iran.

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 5°C in the first days to 3°C by the end.

A typical December day in Mahdishahr reaches about 4°C in the afternoon and slips back to -3°C overnight — a 7°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 5°C cooler than November and about 2°C warmer than January.

-10°-5°10°15°151015202531
Avg high (°C)Avg low (°C)
15-1
25-1
35-1
45-2
55-2
65-2
75-2
84-2
94-2
104-2
114-2
124-2
134-3
144-3
154-3
164-3
174-3
184-3
194-3
204-3
213-3
223-3
233-3
243-3
253-3
263-3
273-3
283-4
293-4
303-4
313-4

How December really feels in Mahdishahr

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.

Mahdishahr weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°245.96.59.90.0
Feb / -4°316.96.610.60.0
Mar / 509.2711.71.5
Apr14° / 5910.72.712.94.3
May20° / 11°5712.20.313.96.2
Jun25° / 15°287.9014.47.5
Jul28° / 18°195.1014.27.5
Aug27° / 17°174.9013.37.9
Sep24° / 14°225.8012.28.1
Oct17° / 2970.611.16.3
Nov / 306.94.310.12.2
Dec / -3°235.95.89.60.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% 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 38%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25842
35842
45743
55743
65743
75644
85644
95644
105743
115842
125842
135941
146040
156040
166238
176337
186337
196535
206535
216733
226733
236931
246931
256931
266931
276931
286832
296832
306832
316733

Chance of precipitation in December

Any precipitationSnow

Mahdishahr gets around 23 mm of rain and snow over 5.9 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 19% and peaks near 25% on the wettest days, and about 6 days bring snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12523
22423
32423
42423
52423
62323
72323
82322
92222
102121
112121
122020
131920
141919
151819
161818
171718
181718
191717
201717
211616
221616
231516
241515
251515
261515
271515
281515
291515
301515
311516

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 4 km/h in December, the calmest month.

Across December, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

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 6:54 AM to 7:11 AM, and sunset from 4:39 PM to 4:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:544:39
29.76:544:39
39.76:554:39
49.76:564:39
59.76:574:39
69.76:584:39
79.76:594:39
89.76:594:39
99.67:004:39
109.67:014:39
119.67:024:39
129.67:024:40
139.67:034:40
149.67:044:40
159.67:044:40
169.67:054:41
179.67:064:41
189.67:064:41
199.67:074:42
209.67:074:42
219.67:084:42
229.67:084:43
239.67:094:43
249.67:094:44
259.67:094:44
269.67:104:45
279.67:104:46
289.67:114:46
299.67:114:47
309.67:114:47
319.67:114:48

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.85 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.85 kWh/m² to a high of 6.95 kWh/m² in June across the year — December's 2.85 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.9Moderate
22.9Moderate
32.8Moderate
42.8Moderate
52.8Moderate
62.8Moderate
72.8Moderate
82.8Moderate
92.8Moderate
102.8Moderate
112.8Moderate
122.8Moderate
132.8Moderate
142.8Moderate
152.8Moderate
162.8Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
262.9Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in December

Is December a good time to visit Mahdishahr?

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 Mahdishahr.

What to pack for Mahdishahr in December

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

In December, Mahdishahr sees daytime highs around 4°C and nights near -3°C. Pack a warm layer. Worth having: a heavy coat. About 6 days see rain.

a warm layera heavy coat

UV index in Mahdishahr in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mahdishahr peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 19UV 11Jan 10UV 3
UV index (midday)Level
Jan3Moderate
Feb5High
Mar5Moderate
Apr8Very high
May10Very high
Jun10Very high
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Mahdishahr 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 Mahdishahr is worst in December — around 45 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (July, 22 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorDec 1944 µg/m³Jul 1822 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb41Poor
Mar39Poor
Apr38Poor
May33Moderate
Jun25Moderate
Jul22Moderate
Aug24Moderate
Sep31Moderate
Oct36Poor
Nov41Poor
Dec45Poor
Location & terrain

Where is Mahdishahr?

Mahdishahr sits at 35.7°N, 53.4°E, 1,600 m above sea level, in Iran. The nearest listed city is Semnan, 15 km away.

DāmghānNekāGarmsār

Topography around Mahdishahr

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

Within 3 km, the terrain around Mahdishahr has large variations in elevation — a maximum elevation change of 628 m around an average of 1,736 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,150 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,814 m.

The land around Mahdishahr is covered by bare terrain (79%) within 3 km, bare terrain (64%) and grassland (31%) within 16 km, and bare terrain (56%) and grassland (26%) within 80 km.

3 km
628 m
16 km
2,150 m
80 km
3,814 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Semnan 15 km · Fīrūzkūh 53 km · Zīr Āb 62 km · Qā’em Shahr 95 km · Sari 98 km · Dāmghān 103 km · Nekā 105 km · Garmsār 107 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 Mahdishahr (35.7107°, 53.3539°, elevation 1,600 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).