Weather and climate in Bialystok (Poland)

The climate of Bialystok is moderately continental, characterized by cold winters, with temperatures often below freezing (0 °C or 32 °F), and pleasantly warm summers.
The city is located in northeastern Poland, in the Podlaskie Voivodeship, near the border with Belarus.
Winter is cold and gray. Snowfalls are frequent, but generally not abundant.
Sometimes, cold waves from Siberia can occur, and the temperatures can drop to -20 °C (-4 °F) or below. The coldest record is -35.4 °C (-31.7 °F) and was set in January 1987.
In summer, the temperatures are pleasant and suitable for outdoor activities, although sometimes there can be rains and thunderstorms.
Every now and then (and more often in recent years due to global warming), there can be short hot periods, with maximum temperatures reaching or exceeding 30 °C (86 °F). The highest record is 36 °C (96.8 °F) and was set in July 1959.

Best Time

The best time to visit Bialystok runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, it can be hot in July and August, while in other circumstances, nights can be cool or even a little cold even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.

Bialystok - Climate data

The average temperature of the coldest month (January) is of -2.9 °C (26.8 °F), that of the warmest month (July) is of 18.4 °C (65.1 °F). Here are the average temperatures.
Precipitation amounts to 610 millimeters (24 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest month (February) to 85 mm (3.3 in) in the wettest one (July). Here is the average precipitation.
There are on average around 1755 sunshine hours per year. Here are the average hours of sunshine per day.

Bialystok - Weather by month

Based on the period 1991-2020

---

January, the coldest month of the year, is generally a very cold month. The average temperature is of -2.9 °C (27 °F), with a minimum of -5.4 °C (22.3 °F) and a maximum of -0.4 °C (31.3 °F).
On the coldest nights of the month, the temperature usually drops to around -18.5 °C (-1.5 °F). However, it dropped to -29 °C (-20.2 °F) in January 2010.
On the warmest days of the month, the temperature usually reaches around 6.5 °C (43.5 °F). However, it reached 11.4 °C (52.5 °F) in January 2007.
Precipitation amounts to 35 mm (1.4 in), distributed over 9 days.
The day lasts on average 8 hours and 10 minutes.
There are on average 1 hours of sunshine per day. So, the sun shines 15% of the time.
The average humidity is 88%. Hence, the air is normally humid.

---

February is generally a very cold month. The average temperature is of -2.0 °C (28 °F), with a minimum of -4.9 °C (23.2 °F) and a maximum of 1 °C (33.8 °F).
On the coldest nights of the month, the temperature usually drops to around -16.5 °C (2.5 °F). However, it dropped to -29.9 °C (-21.8 °F) in February 2012.
On the warmest days of the month, the temperature usually reaches around 8.5 °C (47 °F). However, it reached 13.3 °C (55.9 °F) in February 2002.
Precipitation amounts to 30 mm (1.2 in), distributed over 8 days.
The day lasts on average 9 hours and 55 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 21% of the time.
The average humidity is 85%. Hence, the air is normally humid.

---

March is generally a cold month. The average temperature is of 1.8 °C (35 °F), with a minimum of -2.4 °C (27.7 °F) and a maximum of 6.1 °C (43 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -11 °C (12 °F). However, it dropped to -20.2 °C (-4.4 °F) in March 2006.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15.5 °C (59.5 °F). However, it reached 20.3 °C (68.5 °F) in March 2014.
Precipitation amounts to 35 mm (1.4 in), distributed over 8 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 33% of the time.
The average humidity is 78%. Hence, the air is normally humid.

---

April is generally a quite mild month. The average temperature is of 7.9 °C (46 °F), with a minimum of 2.2 °C (36 °F) and a maximum of 13.6 °C (56.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -5 °C (23 °F). However, it dropped to -7.8 °C (18 °F) in April 2012.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23 °C (74 °F). However, it reached 29.3 °C (84.7 °F) in April 2012.
Precipitation amounts to 40 mm (1.6 in), distributed over 8 days.
The day lasts on average 14 hours and 5 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 70%.

---

May is generally a mild month. The average temperature is of 13 °C (55 °F), with a minimum of 6.8 °C (44.2 °F) and a maximum of 19.2 °C (66.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (30.5 °F). However, it dropped to -4.3 °C (24.3 °F) in May 2000.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 31.1 °C (88 °F) in May 2005.
Precipitation amounts to 70 mm (2.8 in), distributed over 10 days.
The day lasts on average 15 hours and 55 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 71%. Hence, the air is normally humid.

---

June is generally a very mild month. The average temperature is of 16.2 °C (61 °F), with a minimum of 10.3 °C (50.5 °F) and a maximum of 22.2 °C (72 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4 °C (39 °F). However, it dropped to -0.2 °C (31.6 °F) in June 1991.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29.5 °C (85 °F). However, it reached 32.6 °C (90.7 °F) in June 2000.
Precipitation amounts to 65 mm (2.6 in), distributed over 10 days.
The day lasts on average 16 hours and 55 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 8.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 73%. Hence, the air is normally humid.

---

July, the warmest month of the year, is generally a warm month. The average temperature is of 18.4 °C (65 °F), with a minimum of 12.6 °C (54.7 °F) and a maximum of 24.2 °C (75.6 °F).
On the coldest nights of the month, the temperature usually drops to around 7 °C (44.5 °F). However, it dropped to 4.2 °C (39.6 °F) in July 1995.
On the warmest days of the month, the temperature usually reaches around 31 °C (88 °F). However, it reached 35.5 °C (95.9 °F) in July 1994.
Precipitation amounts to 85 mm (3.3 in), distributed over 10 days.
The day lasts on average 16 hours and 20 minutes. So the days are long.
There are on average 8.5 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 75%. Hence, the air is normally humid.

---

August is generally a very mild month. The average temperature is of 17.6 °C (64 °F), with a minimum of 11.6 °C (52.9 °F) and a maximum of 23.7 °C (74.7 °F).
On the coldest nights of the month, the temperature usually drops to around 5.5 °C (41.5 °F). However, it dropped to 3.3 °C (37.9 °F) in August 1993.
On the warmest days of the month, the temperature usually reaches around 31 °C (87.5 °F). However, it reached 35.2 °C (95.4 °F) in August 1992.
Precipitation amounts to 65 mm (2.6 in), distributed over 8 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 77%. Hence, the air is normally humid.

---

September is generally a mild month. The average temperature is of 12.9 °C (55 °F), with a minimum of 7.7 °C (45.9 °F) and a maximum of 18.1 °C (64.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0 °C (32 °F). However, it dropped to -3.6 °C (25.5 °F) in September 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 26 °C (78.5 °F). However, it reached 33.6 °C (92.5 °F) in September 2015.
Precipitation amounts to 55 mm (2.2 in), distributed over 9 days.
The day lasts on average 12 hours and 35 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 82%. Hence, the air is normally humid.

---

October is generally a quite mild month. The average temperature is of 7.6 °C (46 °F), with a minimum of 3.6 °C (38.5 °F) and a maximum of 11.7 °C (53.1 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -5 °C (23 °F). However, it dropped to -10.4 °C (13.3 °F) in October 2012.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 20 °C (68 °F). However, it reached 23.4 °C (74.1 °F) in October 1995.
Precipitation amounts to 45 mm (1.8 in), distributed over 8 days.
The day lasts on average 10 hours and 30 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 86%. Hence, the air is normally humid.

---

November is generally a cold month. The average temperature is of 2.7 °C (37 °F), with a minimum of 0.2 °C (32.4 °F) and a maximum of 5.2 °C (41.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -8.5 °C (17 °F). However, it dropped to -19.2 °C (-2.6 °F) in November 1998.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 13 °C (56 °F). However, it reached 18.5 °C (65.3 °F) in November 2014.
Precipitation amounts to 40 mm (1.6 in), distributed over 9 days.
The day lasts on average 8 hours and 35 minutes.
There are on average 1.5 hours of sunshine per day. So, the sun shines 15% of the time.
The average humidity is 90%. Hence, the air is normally humid.

---

December is generally a very cold month. The average temperature is of -1.3 °C (30 °F), with a minimum of -3.6 °C (25.5 °F) and a maximum of 1 °C (33.8 °F).
On the coldest nights of the month, the temperature usually drops to around -14.5 °C (5.5 °F). However, it dropped to -29.3 °C (-20.7 °F) in December 1996.
On the warmest days of the month, the temperature usually reaches around 7.5 °C (45.5 °F). However, it reached 12.1 °C (53.8 °F) in December 2015.
Precipitation amounts to 40 mm (1.6 in), distributed over 9 days.
The day lasts on average 7 hours and 35 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 1 hours of sunshine per day. So, the sun shines 12% of the time.
The average humidity is 90%. Hence, the air is normally humid.