Ostrów Mazowiecka weather in December

In December, Ostrów Mazowiecka sees average daytime highs of 1°C and overnight lows near -3°C, with 43 mm of precipitation across 10.2 wet days and about 7.5 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 2°C in the first days to 1°C by the end. The sky is clear or mostly clear about 8% of the time in December, and the air most often feels dry.

Daylight stretches from about 7 h 42 min at the start of December to 7 h 24 min by month's end. Set against the rest of the year, December is Ostrów Mazowiecka's 12th-clearest and 2nd-windiest month. For the whole year in context, see Ostrów Mazowiecka's year-round climate.

Daytime high
10th warmest
Overnight low
-3°
3rd coldest
Precipitation
43 mm
10.2 wet days
Daylight
7 h 24 min
7:47 AM – 3:10 PM
Cloud cover
83%
12th clearest
Wind
14 km/h
2nd windiest
Solar energy
0.49 kWh/m²
Travel score
0.0
out of 10

Ostrów Mazowiecka is city and urban gmina of Poland.

Density
1,030/km²
people per km²
Founded
1434

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 1°C by the end.

A typical December day in Ostrów Mazowiecka reaches about 1°C in the afternoon and slips back to -3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -5°C and 7°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
13-1
22-1
32-1
42-2
52-2
62-2
72-2
82-2
92-2
102-2
112-2
122-2
132-2
142-2
151-3
161-3
171-3
181-3
191-3
201-3
211-3
221-3
231-3
241-3
251-4
261-4
271-4
281-4
291-4
301-4
311-4

How December really feels in Ostrów Mazowiecka

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.

Ostrów Mazowiecka weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°4010.46.57.90.0
Feb / -4°379.25.99.50.0
Mar / -1°409.93.511.50.6
Apr13° / 4610113.63.7
May19° / 6711.80.115.55.8
Jun22° / 12°7411.9016.56.2
Jul24° / 14°7812.4016.16.5
Aug24° / 13°6510.3014.56.8
Sep18° / 5810012.45.6
Oct12° / 469.50.410.33.1
Nov / 399.42.78.40.5
Dec / -3°4310.25.17.50.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of December, with mostly cloudy or overcast conditions the remaining 86%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11684
21585
31585
41585
51585
61486
71486
81387
91387
101387
111387
121387
131387
141387
151387
161288
171288
181486
191486
201486
211585
221585
231585
241585
251585
261684
271882
281882
291882
301882
311882

Chance of precipitation in December

Any precipitationSnow

Ostrów Mazowiecka gets around 43 mm of rain and snow over 10.2 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 33% and peaks near 35% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13014
23014
33114
43215
53215
63315
73415
83416
93416
103516
113517
123417
133418
143418
153418
163418
173419
183419
193319
203318
213318
223218
233218
243318
253318
263318
273418
283418
293518
303518
313518

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 14 km/h in December.

Across December, daily wind ranges from about 14 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 7 h 42 min at the start of December to 7 h 24 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 7:30 AM to 7:53 AM, and sunset from 3:14 PM to 3:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.77:303:14
27.77:323:13
37.77:333:13
47.67:343:12
57.67:363:12
67.67:373:11
77.57:383:11
87.57:393:11
97.57:403:10
107.57:413:10
117.57:423:10
127.47:433:10
137.47:443:10
147.47:453:10
157.47:463:10
167.47:473:10
177.47:483:10
187.47:483:11
197.47:493:11
207.47:503:11
217.47:503:12
227.47:513:12
237.47:513:13
247.47:523:13
257.47:523:14
267.47:523:14
277.47:523:15
287.47:533:16
297.47:533:17
307.47:533:17
317.47:533:18

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.49 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.49 kWh/m² to a high of 5.46 kWh/m² in June across the year — December's 0.49 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.6Dim
20.6Dim
30.5Dim
40.5Dim
50.5Dim
60.5Dim
70.5Dim
80.5Dim
90.5Dim
100.5Dim
110.5Dim
120.5Dim
130.5Dim
140.5Dim
150.5Dim
160.5Dim
170.5Dim
180.5Dim
190.5Dim
200.5Dim
210.5Dim
220.5Dim
230.5Dim
240.5Dim
250.5Dim
260.5Dim
270.5Dim
280.5Dim
290.5Dim
300.5Dim
310.5Dim
Planning a trip in December

Is December a good time to visit Ostrów Mazowiecka?

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 Ostrów Mazowiecka.

What to pack for Ostrów Mazowiecka in December

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

In December, Ostrów Mazowiecka sees daytime highs around 1°C and nights near -3°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

UV index in Ostrów Mazowiecka 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 Ostrów Mazowiecka peaks around June 20 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 6Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Ostrów Mazowiecka?

Ostrów Mazowiecka sits at 52.8°N, 21.9°E, 122 m above sea level, in Poland. The nearest listed city is Zambrów, 31 km away.

OstrołękaŁomżaSokołów PodlaskiPułtuskWołominŁapy

Topography around Ostrów Mazowiecka

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

Within 3 km, the terrain around Ostrów Mazowiecka has only modest variations in elevation — a maximum elevation change of 41 m around an average of 130 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 89 m; within 80 km, only modest variations in elevation — a maximum elevation change of 167 m.

The land around Ostrów Mazowiecka is covered by trees (41%) and cropland (25%) within 3 km, trees (43%), cropland (29%) and grassland (25%) within 16 km, and trees (36%), cropland (35%) and grassland (28%) within 80 km.

3 km
41 m
16 km
89 m
80 km
167 m
treesgrasslandcroplandartificial surfaces
December weather nearby: Zambrów 31 km · Wyszków 38 km · Ostrołęka 38 km · Łomża 43 km · Sokołów Podlaski 50 km · Pułtusk 56 km · Wołomin 68 km · Łapy 70 km

Poland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 52% of US
price level, 2025
GDP per capita
$28,420
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
9.4
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 600
Religion
Roman Catholic 71%refused to answer 21%no religion 7%

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 Ostrów Mazowiecka (52.8025°, 21.8951°, elevation 122 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).