Climate guideThirty-year normals for Ostrołęka, Mazovia
Ostrołęka climate by month
Warm-summer humid continental · DfbBest May · Aug–Sep
Annual mean9°day and night
Seasonal swing21°warmest vs coolest
Precipitation635 mm138 wet days a year
53.09° N, 21.58° EElevation 97 mUTC+1 · Central European Standard Time
When to goOstrołęka · weather score
Best timeMay · Aug–Sep
October: high / low12° / 5°
iSummary
What the weather is like
Ostrołęka has a warm-summer humid continental climate (Köppen Dfb): warm summers, cold winters and precipitation in every season.
The warmest month is July, when afternoons average 25° and nights 14°. January is the coolest month, with highs of 0° and lows of -4°. The difference between the warmest and the coolest month is about 21°, a large swing typical of continental interiors.
About 635 mm of precipitation falls in an average year. July is the wettest month (76 mm, 15 wet days) and April the driest (40 mm, 9 wet days). Cloud cover ranges from 33% in August to 63% in December.
Compared with Warsaw, the capital, Ostrołęka is 0.3° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 25° · July
- Coldest nights
- -4° · January
- Wettest month
- July
- Driest month
- April
- Clearest skies
- August · 33% cloud
- Longest day
- 16 h 55 min
- Shortest day
- 7 h 35 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 0° | 2° | 7° | 14° | 20° | 23° | 25° | 25° | 19° | 12° | 6° | 2° |
| Average low | -4° | -4° | -1° | 3° | 8° | 11° | 14° | 13° | 9° | 5° | 1° | -3° |
| Precipitation | 36 mm | 30 mm | 40 mm | 40 mm | 62 mm | 85 mm | 76 mm | 71 mm | 62 mm | 43 mm | 46 mm | 44 mm |
| Wet days (≥1 mm) | 12.2 | 9.4 | 9.9 | 8.6 | 13.5 | 13.8 | 14.7 | 12 | 9.8 | 10.8 | 12.1 | 10.9 |
| Cloud cover | 60% | 57% | 49% | 41% | 36% | 37% | 34% | 33% | 42% | 46% | 59% | 63% |
| Daylight | 8h 06 | 9h 52 | 11h 47 | 13h 57 | 15h 49 | 16h 55 | 16h 28 | 14h 49 | 12h 44 | 10h 40 | 8h 42 | 7h 35 |
| Month score | 17 | 25 | 27 | 55 | 66 | 65 | 65 | 70 | 72 | 38 | 17 | 19 |
ivMonth by month
Ostrołęka in every month
January17
0° / -4°
36 mm · 12.2 wet days
February25
2° / -4°
30 mm · 9.4 wet days
March27
7° / -1°
40 mm · 9.9 wet days
April55
14° / 3°
40 mm · 8.6 wet days
May66
20° / 8°
62 mm · 13.5 wet days
June65
23° / 11°
85 mm · 13.8 wet days
July65
25° / 14°
76 mm · 14.7 wet days
August70
25° / 13°
71 mm · 12 wet days
September72
19° / 9°
62 mm · 9.8 wet days
October38
12° / 5°
43 mm · 10.8 wet days
November17
6° / 1°
46 mm · 12.1 wet days
December19
2° / -3°
44 mm · 10.9 wet days