Iași weather in December

In December, Iași sees average daytime highs of 2°C and overnight lows near -3°C, with 35 mm of precipitation across 7.1 wet days and about 8.4 hours of daylight. It is the 11th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 4°C in the first days to 1°C by the end. The sky is clear or mostly clear about 17% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 36 min at the start of December to 8 h 18 min by month's end. Set against the rest of the year, December is Iași's 10th-clearest and 6th-windiest month. For the whole year in context, see Iași's year-round climate.

Daytime high
11th warmest
Overnight low
-3°
3rd coldest
Precipitation
35 mm
7.1 wet days
Daylight
8 h 18 min
7:57 AM – 4:15 PM
Cloud cover
73%
10th clearest
Wind
10 km/h
6th windiest
Solar energy
0.95 kWh/m²
Travel score
0.0
out of 10

Iași is city and seat of Iași County in the historical region of Moldavia in north-eastern Romania.

Air quality
High
PM2.5 27 µg/m³ · 2018
Density
4,031/km²
people per km²
Founded
1408

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 4°C in the first days to 1°C by the end.

A typical December day in Iași reaches about 2°C in the afternoon and slips back to -3°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 8°C. Set against its neighbours, December runs about 6°C cooler than November and about 1°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
14-1
24-1
34-1
44-1
53-2
63-2
73-2
83-2
93-2
103-2
113-2
123-2
132-3
142-3
152-3
162-3
172-3
182-3
192-3
202-4
212-4
222-4
232-4
242-4
252-4
261-4
271-4
281-4
291-4
301-4
311-4

How December really feels in Iași

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.

Iași weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°286.55.18.70.0
Feb / -4°286.13.6100.0
Mar / 368.62.411.61.9
Apr16° / 458.50.313.35.2
May22° / 11°6110.4014.86.7
Jun26° / 15°7510.7015.66.6
Jul28° / 17°7210015.36.4
Aug28° / 16°497.10146.8
Sep22° / 12°507.2012.47.1
Oct15° / 446.40.110.65.1
Nov / 365.92.19.11.5
Dec / -3°357.14.28.40.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 72%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22773
32674
42773
52872
62872
72872
82872
92872
102872
112971
122971
132971
142971
152872
162971
172971
182971
192971
202971
213070
222971
232971
242971
252872
262872
272773
282773
292773
302773
312773

Chance of precipitation in December

Any precipitationSnow

Iași gets around 35 mm of rain and snow over 7.1 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 23% and peaks near 24% on the wettest days, and about 4 days bring snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
12311
22311
32211
42211
52211
62211
72211
82212
92212
102212
112212
122213
132213
142213
152214
162314
172315
182315
192315
202315
212315
222415
232415
242315
252315
262315
272416
282416
292416
302416
312417

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 10 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 36 min at the start of December to 8 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over December. Sunrise moves from 7:42 AM to 8:03 AM, and sunset from 4:16 PM to 4:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.67:424:16
28.57:434:16
38.57:454:16
48.57:464:15
58.57:474:15
68.57:484:15
78.47:494:15
88.47:504:15
98.47:514:14
108.47:524:14
118.47:534:14
128.37:534:14
138.37:544:14
148.37:554:15
158.37:564:15
168.37:574:15
178.37:574:15
188.37:584:15
198.37:594:16
208.37:594:16
218.38:004:17
228.38:004:17
238.38:014:18
248.38:014:18
258.38:014:19
268.38:024:19
278.38:024:20
288.38:024:21
298.38:024:21
308.38:034:22
318.38:034:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.95 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.95 kWh/m² to a high of 5.92 kWh/m² in June across the year — December's 0.95 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.0Dim
21.0Dim
31.0Dim
40.9Dim
50.9Dim
60.9Dim
70.9Dim
80.9Dim
90.9Dim
100.9Dim
110.9Dim
120.9Dim
130.9Dim
140.9Dim
150.9Dim
160.9Dim
170.9Dim
181.0Dim
191.0Dim
201.0Dim
211.0Dim
221.0Dim
231.0Dim
241.0Dim
251.0Dim
261.0Dim
271.0Dim
281.0Dim
291.0Dim
301.0Dim
311.0Dim
Planning a trip in December

Is December a good time to visit Iași?

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 Iași.

What to pack for Iași in December

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

In December, Iași sees daytime highs around 2°C and nights near -3°C. Pack a warm layer and a heavy coat. About 7 days see rain.

a warm layera heavy coat

UV index in Iași in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Iași peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr6High
May5Moderate
Jun7Very high
Jul8Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Iași 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 Iași is worst in July — around 35 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 19 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Iași's WHO annual average of 27 µg/m³.

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 1535 µg/m³Dec 1420 µg/m³
PM2.5 (µg/m³)Level
Jan24Moderate
Feb26Moderate
Mar34Moderate
Apr28Moderate
May28Moderate
Jun32Moderate
Jul35Moderate
Aug30Moderate
Sep25Moderate
Oct21Moderate
Nov21Moderate
Dec19Moderate
Location & terrain

Where is Iași?

Iași sits at 47.2°N, 27.6°E, 66 m above sea level, in Romania. The nearest listed city is Ungheni, 16 km away.

RomanVasluiBilicenii VechiHuşiPaşcaniBălţiStrășeni

Topography around Iași

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

Within 3 km, the terrain around Iași has only modest variations in elevation — a maximum elevation change of 114 m around an average of 74 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 396 m; within 80 km, significant variations in elevation — a maximum elevation change of 583 m.

The land around Iași is covered by artificial surfaces (44%) and trees (31%) within 3 km, cropland (38%), trees (29%) and grassland (24%) within 16 km, and cropland (47%), trees (27%) and grassland (23%) within 80 km.

3 km
114 m
16 km
396 m
80 km
583 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Ungheni 16 km · Roman 58 km · Vaslui 60 km · Bilicenii Vechi 64 km · Huşi 65 km · Paşcani 67 km · Bălţi 71 km · Strășeni 76 km

Romania travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 44% of US
price level, 2025
GDP per capita
$22,538
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
82%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
10.3
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 605
Religion
Romanian Orthodox 85%other 5%Roman Catholic 5%Reformed 3%

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 Iași (47.1667°, 27.6°, elevation 66 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).