Darreh Shahr weather in December

In December, Darreh Shahr sees average daytime highs of 13°C and overnight lows near 2°C, with 87 mm of precipitation across 8.5 wet days and about 9.8 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 12°C by the end. The sky is clear or mostly clear about 44% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 48 min by month's end. Set against the rest of the year, December is Darreh Shahr's 11th-clearest and 11th-windiest month. For the whole year in context, see Darreh Shahr's year-round climate.

Daytime high
13°
10th warmest
Overnight low
3rd coldest
Precipitation
87 mm
8.5 wet days
Daylight
9 h 48 min
7:22 AM – 5:11 PM
Cloud cover
47%
11th clearest
Wind
5 km/h
11th windiest
Solar energy
2.81 kWh/m²
Travel score
3.7
out of 10

Darreh Shahr is city in Ilam Province, Iran.

Density
8,184/km²
people per km²
Founded
1964

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 14°C in the first days to 12°C by the end.

A typical December day in Darreh Shahr reaches about 13°C in the afternoon and slips back to 2°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 17°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1144
2144
3143
4143
5143
6143
7143
8133
9133
10133
11133
12133
13133
14133
15132
16122
17122
18122
19122
20122
21122
22122
23122
24122
25122
26122
27122
28122
29122
30122
31121

How December really feels in Darreh Shahr

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 3 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
3
wind chill below the day's low

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

Darreh Shahr weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan11° / 939.62.310.12.6
Feb13° / 799.4110.83.6
Mar17° / 928.70.111.75.7
Apr22° / 10°687.6012.87.3
May29° / 14°163.2013.76.6
Jun36° / 18°00.1014.12.9
Jul39° / 21°000140.8
Aug39° / 20°00013.21.0
Sep34° / 16°10.1012.24.1
Oct27° / 11°273.1011.27.7
Nov18° / 737.2010.36.3
Dec13° / 878.50.69.83.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 (%)
16139
26040
36040
45941
55941
65941
75842
85743
95743
105743
115743
125842
135743
145743
155842
165842
175842
185941
195941
205941
216040
226040
236040
246040
256040
266040
276040
285941
295941
305941
315842

Chance of precipitation in December

Any precipitationSnow

Darreh Shahr gets around 87 mm of rain and snow over 8.5 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 28% and peaks near 31% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1281
2281
3281
4291
5291
6301
7302
8312
9312
10312
11312
12312
13302
14302
15292
16292
17282
18282
19272
20262
21262
22252
23252
24242
25242
26242
27242
28242
29253
30253
31263

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
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 48 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 7:11 AM to 7:29 AM, and sunset from 5:09 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.07:115:09
210.07:125:09
39.97:135:09
49.97:145:09
59.97:145:09
69.97:155:09
79.97:165:09
89.97:175:09
99.97:175:10
109.97:185:10
119.97:195:10
129.87:195:10
139.87:205:10
149.87:215:11
159.87:215:11
169.87:225:11
179.87:235:12
189.87:235:12
199.87:245:12
209.87:245:13
219.87:255:13
229.87:255:14
239.87:265:14
249.87:265:15
259.87:275:15
269.87:275:16
279.87:275:16
289.87:285:17
299.87:285:17
309.87:285:18
319.87:295:19

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.81 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.81 kWh/m² to a high of 8.06 kWh/m² in June across the year — December's 2.81 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
13.0Moderate
23.0Moderate
32.9Moderate
42.9Moderate
52.9Moderate
62.9Moderate
72.9Moderate
82.8Moderate
92.8Moderate
102.8Moderate
112.8Moderate
122.8Moderate
132.8Moderate
142.8Moderate
152.8Moderate
162.8Moderate
172.8Moderate
182.8Moderate
192.8Moderate
202.8Moderate
212.8Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in December

Hazard calendar for Darreh Shahr

In seasonPeak

In December, Darreh Shahr sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Darreh Shahr's rainy season runs November–April, when most of the year's rain falls.

Darreh Shahr sees seasonal dust haze (March–May), heaviest in May.

Rainy season
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Darreh Shahr?

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

3.7
Sightseeing
7th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Darreh Shahr.

What to pack for Darreh Shahr in December

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

In December, Darreh Shahr sees daytime highs around 13°C and nights near 2°C. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

UV index in Darreh Shahr 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 Darreh Shahr peaks around June 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 13 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 17UV 10Jan 13UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May10Very high
Jun11Extreme
Jul10Very high
Aug10Very high
Sep7Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Darreh 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 Darreh Shahr is worst in April — around 42 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (November, 26 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateApr 2142 µg/m³Nov 2326 µg/m³
PM2.5 (µg/m³)Level
Jan27Moderate
Feb32Moderate
Mar39Poor
Apr42Poor
May41Poor
Jun35Poor
Jul35Poor
Aug33Moderate
Sep32Moderate
Oct30Moderate
Nov26Moderate
Dec26Moderate
Location & terrain

Where is Darreh Shahr?

Darreh Shahr sits at 33.1°N, 47.4°E, 667 m above sea level, in Iran. The nearest listed city is Ābdānān, 17 km away.

ĪlāmAleshtar

Topography around Darreh Shahr

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

Within 3 km, the terrain around Darreh Shahr has significant variations in elevation — a maximum elevation change of 318 m around an average of 686 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,666 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,732 m.

The land around Darreh Shahr is covered by cropland (42%) and grassland (39%) within 3 km, grassland (62%) and cropland (22%) within 16 km, and grassland (63%) and bare terrain (21%) within 80 km.

3 km
318 m
16 km
1,666 m
80 km
2,732 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Ābdānān 17 km · Poldokhtar 31 km · Kūhdasht 48 km · Dehlorān 51 km · Khorramabad 98 km · ‘Alī al Gharbī 100 km · Īlām 104 km · Aleshtar 114 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 Darreh Shahr (33.1445°, 47.3799°, elevation 667 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).