Zanjan weather in December

In December, Zanjan sees average daytime highs of 5°C and overnight lows near -4°C, with 40 mm of precipitation across 7.8 wet days and about 9.5 hours of daylight. It is the 10th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 6°C in the first days to 4°C by the end. The sky is clear or mostly clear about 40% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Zanjan's 8th-clearest and 11th-windiest month. For the whole year in context, see Zanjan's year-round climate.

Daytime high
10th warmest
Overnight low
-4°
3rd coldest
Precipitation
40 mm
7.8 wet days
Daylight
9 h 30 min
7:27 AM – 4:57 PM
Cloud cover
51%
8th clearest
Wind
8 km/h
11th windiest
Solar energy
2.51 kWh/m²
Travel score
0.1
out of 10

Zanjan is city in Zanjan Province, Iran.

Air quality
Elevated
PM2.5 17.5 µg/m³ · 2020

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 6°C in the first days to 4°C by the end.

A typical December day in Zanjan reaches about 5°C in the afternoon and slips back to -4°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between -1°C and 10°C. Set against its neighbours, December runs about 6°C cooler than November and about 2°C warmer than January.

-10°10°151015202531
Avg high (°C)Avg low (°C)
17-2
26-3
36-3
46-3
56-3
66-3
75-3
85-3
95-4
105-4
115-4
125-4
135-4
145-4
154-4
164-4
174-5
184-5
194-5
204-5
214-5
224-5
234-5
244-5
254-5
264-5
274-5
284-5
294-5
304-5
314-5

How December really feels in Zanjan

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.

Zanjan weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°438.98.59.80.0
Feb / -6°539.98.110.60.2
Mar10° / -1°6812.76.811.72.2
Apr16° / 7613.31.512.94.5
May21° / 5812.50.113.96.4
Jun26° / 12°174.7014.58.0
Jul29° / 14°102.8014.37.4
Aug29° / 14°62.1013.47.2
Sep25° / 11°82.2012.28.6
Oct19° / 356.60.411.16.8
Nov10° / 558.83.6102.5
Dec / -4°407.86.59.50.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45446
55347
65347
75347
85248
95248
105248
115248
125248
135347
145347
155446
165545
175644
185743
195842
205842
215941
226040
236040
246040
256040
266040
276040
286040
295842
305842
315743

Chance of precipitation in December

Any precipitationSnow

Zanjan gets around 40 mm of rain and snow over 7.8 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 25% and peaks near 29% on the wettest days, and about 7 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12921
22921
32921
42822
52822
62822
72823
82823
92823
102823
112723
122723
132722
142622
152622
162622
172522
182521
192421
202421
212320
222320
232220
242219
252219
262219
272219
282220
292320
302321
312422

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 8 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 42 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 12 minutes over December. Sunrise moves from 7:16 AM to 7:33 AM, and sunset from 4:56 PM to 5:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.77:164:56
29.77:164:56
39.67:174:56
49.67:184:56
59.67:194:56
69.67:204:56
79.67:214:56
89.67:214:56
99.67:224:56
109.67:234:56
119.57:244:56
129.57:244:56
139.57:254:56
149.57:264:57
159.57:264:57
169.57:274:57
179.57:284:58
189.57:284:58
199.57:294:58
209.57:294:59
219.57:304:59
229.57:305:00
239.57:315:00
249.57:315:01
259.57:325:01
269.57:325:02
279.57:325:02
289.57:335:03
299.57:335:04
309.57:335:04
319.57:335:05

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.51 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 7.34 kWh/m² in June across the year — December's 2.51 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.5Moderate
42.5Moderate
52.5Moderate
62.5Moderate
72.5Moderate
82.5Moderate
92.5Moderate
102.5Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.5Moderate
152.5Moderate
162.5Moderate
172.5Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.7Moderate
Planning a trip in December

Is December a good time to visit Zanjan?

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

0.1
Sightseeing
11th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Zanjan.

What to pack for Zanjan in December

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

In December, Zanjan sees daytime highs around 5°C and nights near -4°C. Pack a warm layer and a heavy coat. About 8 days see rain.

a warm layera heavy coat

UV index in Zanjan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Zanjan peaks around July 18 at about 11 (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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJul 18UV 11Jan 13UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct5High
Nov3Moderate
Dec4Moderate

Air quality in Zanjan 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 Zanjan is worst in April — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (July, 13 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Zanjan's WHO annual average of 17.5 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1724 µg/m³Jul 2214 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar23Moderate
Apr25Moderate
May23Moderate
Jun17Moderate
Jul13Moderate
Aug14Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Zanjan?

Zanjan sits at 36.7°N, 48.5°E, 1,666 m above sea level, in Iran. The nearest listed city is Qīdar, 63 km away.

Şowme‘eh Sarā

Topography around Zanjan

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

Within 3 km, the terrain around Zanjan has only modest variations in elevation — a maximum elevation change of 175 m around an average of 1,672 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,155 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,101 m.

The land around Zanjan is covered by artificial surfaces (73%) within 3 km, grassland (51%) and cropland (30%) within 16 km, and grassland (53%) and cropland (36%) within 80 km.

3 km
175 m
16 km
1,155 m
80 km
3,101 m
treesgrasslandcroplandartificial surfacesbare terrain
December weather nearby: Qīdar 63 km · Manjīl 81 km · Khorramdarreh 81 km · Pādegān-e Manjīl 82 km · Abhar 87 km · Fūman 95 km · Māsāl 95 km · Şowme‘eh Sarā 101 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 Zanjan (36.6764°, 48.4963°, elevation 1,666 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).