Fīrūzkūh weather in December

In December, Fīrūzkūh sees average daytime highs of 1°C and overnight lows near -6°C, with 27 mm of precipitation across 6.4 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 2°C in the first days to 0°C by the end. The sky is clear or mostly clear about 50% 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 Fīrūzkūh's 7th-clearest and 11th-windiest month. For the whole year in context, see Fīrūzkūh's year-round climate.

Daytime high
10th warmest
Overnight low
-6°
3rd coldest
Precipitation
27 mm
6.4 wet days
Daylight
9 h 36 min
7:07 AM – 4:43 PM
Cloud cover
44%
7th clearest
Wind
5 km/h
11th windiest
Solar energy
2.92 kWh/m²
Travel score
0.0
out of 10

Fīrūzkūh is city in Tehran 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 2°C in the first days to 0°C by the end.

A typical December day in Fīrūzkūh reaches about 1°C in the afternoon and slips back to -6°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 6°C. Set against its neighbours, December runs about 6°C cooler than November and about 3°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
13-4
23-4
32-4
42-5
52-5
62-5
72-5
82-5
92-5
101-5
111-5
121-6
131-6
141-6
151-6
161-6
171-6
181-6
191-6
201-6
211-6
221-6
231-6
240-6
250-7
260-7
270-7
280-7
290-7
300-7
310-7

How December really feels in Fīrūzkūh

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.

Fīrūzkūh weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -8°276.57.49.90.0
Feb-1° / -7°367.37.910.60.0
Mar / -3°539.47.811.70.2
Apr11° / 6311.93.412.92.5
May17° / 6313.70.513.95.0
Jun22° / 12°4310.7014.46.9
Jul25° / 15°388.8014.27.7
Aug24° / 15°337.7013.48.0
Sep21° / 11°328.2012.27.3
Oct14° / 368.71.211.14.7
Nov / -1°357.65.910.10.9
Dec / -6°276.46.79.60.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
45941
55941
65941
75941
85842
95941
105941
116139
126139
136238
146238
156337
166436
176535
186535
196733
206733
216832
226931
237030
247030
257129
267129
277030
287030
297030
307030
316931

Chance of precipitation in December

Any precipitationSnow

Fīrūzkūh gets around 27 mm of rain and snow over 6.4 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 20% and peaks near 25% on the wettest days, and about 7 days bring snow. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12526
22526
32526
42526
52526
62425
72425
82425
92324
102324
112223
122122
132122
142021
152021
162021
171920
181920
191920
201919
211819
221819
231818
241718
251718
261718
271718
281718
291719
301819
311819

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 5 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
275calm
285calm
295calm
305calm
315calm

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 6:56 AM to 7:14 AM, and sunset from 4:41 PM to 4:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:564:41
29.76:574:41
39.76:584:41
49.76:594:41
59.76:594:41
69.77:004:41
79.77:014:41
89.77:024:41
99.67:034:41
109.67:034:41
119.67:044:42
129.67:054:42
139.67:054:42
149.67:064:42
159.67:074:42
169.67:074:43
179.67:084:43
189.67:094:43
199.67:094:44
209.67:104:44
219.67:104:45
229.67:114:45
239.67:114:46
249.67:124:46
259.67:124:47
269.67:124:47
279.67:134:48
289.67:134:48
299.67:134:49
309.67:144:50
319.67:144:50

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.92 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 6.7 kWh/m² in June across the year — December's 2.92 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
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.1Moderate
Planning a trip in December

Is December a good time to visit Fīrūzkūh?

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
8th-best month of the year

December is a weaker month for outdoor sightseeing in Fīrūzkūh.

What to pack for Fīrūzkūh in December

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

In December, Fīrūzkūh sees daytime highs around 1°C and nights near -6°C. Pack a warm layer and a heavy coat. About 6 days see rain.

a warm layera heavy coat

UV index in Fīrūzkūh 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 Fīrūzkūh peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 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 11UV 3
UV index (midday)Level
Jan3Moderate
Feb5High
Mar5Moderate
Apr8Very high
May10Very high
Jun10Very high
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Fīrūzkūh 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 Fīrūzkūh is worst in December — around 97 µg/m³ PM2.5 (unhealthy), about 3.0× the cleanest month (July, 33 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorPoorUnhealthyDec 2396 µg/m³Jul 1833 µg/m³
PM2.5 (µg/m³)Level
Jan95Unhealthy
Feb88Unhealthy
Mar76Unhealthy
Apr68Unhealthy
May57Unhealthy
Jun42Poor
Jul33Moderate
Aug38Poor
Sep51Poor
Oct67Unhealthy
Nov83Unhealthy
Dec97Unhealthy
Location & terrain

Where is Fīrūzkūh?

Fīrūzkūh sits at 35.8°N, 52.8°E, 1,943 m above sea level, in Iran. The nearest listed city is Zīr Āb, 50 km away.

Topography around Fīrūzkūh

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

Within 3 km, the terrain around Fīrūzkūh has significant variations in elevation — a maximum elevation change of 555 m around an average of 2,025 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,550 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,587 m.

The land around Fīrūzkūh is covered by grassland (47%) and bare terrain (21%) within 3 km, grassland (67%) and bare terrain (20%) within 16 km, and grassland (37%), bare terrain (37%) and trees (20%) within 80 km.

3 km
555 m
16 km
1,550 m
80 km
5,587 m
treesgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Zīr Āb 50 km · Mahdishahr 53 km · Semnan 60 km · Damāvand 63 km · Garmsār 71 km · Īstgāh-e Rāh Āhan-e Garmsār 72 km · Rūdehen 78 km · Qā’em Shahr 79 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 Fīrūzkūh (35.7567°, 52.7706°, elevation 1,943 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).