The city is located in southern Finland, about 90 km (55 mi) north of Helsinki.
, when it doesn't get completely dark even at midnight, occur from May 9th to August 5th.
, there can be cold spells of arctic origin. The coldest record is -35.6 °C (-32.1 °F) and was set in February 1967.
, there can be short hot periods. The highest record is 35 °C (95 °F) and was set in July 2010.
, from June to August, since it is the mildest season. However, you must take into account some rainy days and a bit of cold at night.
. Here are the average temperatures.
January is generally a freezing cold month. The average temperature is of
-6.1 °C, with a minimum of
-9.1 °C and a maximum of
-3 °C.

On the coldest nights of the month, the temperature usually drops to around
-23.5 °C. However, it dropped to
-33 °C in January 2003.

On the warmest days of the month, the temperature usually reaches around
4 °C. However, it reached
9.5 °C in January 2019.

Precipitation amounts to
45 mm, distributed over 12 days.
The day lasts on average 6 hours and 35 minutes. So the days are short.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is of
11 kph.
February, the coldest month of the year, is generally a freezing cold month. The average temperature is of
-6.4 °C, with a minimum of
-9.8 °C and a maximum of
-2.9 °C.

On the coldest nights of the month, the temperature usually drops to around
-24 °C. However, it dropped to
-32.4 °C in February 1996.

On the warmest days of the month, the temperature usually reaches around
4 °C. However, it reached
7.8 °C in February 2015.

Precipitation amounts to
35 mm, distributed over 9 days.
The day lasts on average 9 hours and 5 minutes.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is of
10 kph.
March is generally a very cold month. The average temperature is of
-2.3 °C, with a minimum of
-6.8 °C and a maximum of
2.1 °C.

On the coldest nights of the month, the temperature usually drops to around
-18.5 °C. However, it dropped to
-26.9 °C in March 2013.

On the warmest days of the month, the temperature usually reaches around
9.5 °C. However, it reached
16.6 °C in March 2007.

Precipitation amounts to
30 mm, distributed over 8 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
11 kph.
April is generally a cold month. The average temperature is of
3.9 °C, with a minimum of
-1.4 °C and a maximum of
9.1 °C.

On the coldest nights of the month, the temperature usually drops to around
-9 °C. However, it dropped to
-16.5 °C in April 1998.

On the warmest days of the month, the temperature usually reaches around
18.5 °C. However, it reached
24.2 °C in April 1998.

Precipitation amounts to
30 mm, distributed over 7 days.
The day lasts on average 14 hours and 50 minutes.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is of
12 kph.
May is generally a mild month. The average temperature is of
10 °C, with a minimum of
3.7 °C and a maximum of
16.3 °C.

On the coldest nights of the month, the temperature usually drops to around
-3.5 °C. However, it dropped to
-7 °C in May 1995.

On the warmest days of the month, the temperature usually reaches around
25 °C. However, it reached
30.1 °C in May 1995.

Precipitation amounts to
40 mm, distributed over 8 days.
The day lasts on average 17 hours and 30 minutes. So the days are very long.
The average humidity is 67%.
The average wind speed is of
12 kph.
June is generally a mild month. The average temperature is of
14.3 °C, with a minimum of
8.5 °C and a maximum of
20.1 °C.

On the coldest nights of the month, the temperature usually drops to around
1.5 °C. However, it dropped to
-1.8 °C in June 2017.

On the warmest days of the month, the temperature usually reaches around
27 °C. However, it reached
32.1 °C in June 1999.

Precipitation amounts to
65 mm, distributed over 9 days.
The day lasts on average 19 hours and 5 minutes. So the days are very long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 67%.
The average wind speed is of
12 kph.
July, the warmest month of the year, is generally a very mild month. The average temperature is of
17.4 °C, with a minimum of
11.6 °C and a maximum of
23.1 °C.

On the coldest nights of the month, the temperature usually drops to around
5.5 °C. However, it dropped to
1.8 °C in July 2009.

On the warmest days of the month, the temperature usually reaches around
28.5 °C. However, it reached
35 °C in July 2010.

Precipitation amounts to
70 mm, distributed over 10 days.
The day lasts on average 18 hours and 10 minutes. So the days are very long.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of
10 kph.
August is generally a very mild month. The average temperature is of
15.6 °C, with a minimum of
10.1 °C and a maximum of
21.1 °C.

On the coldest nights of the month, the temperature usually drops to around
3.5 °C. However, it dropped to
0.6 °C in August 1994.

On the warmest days of the month, the temperature usually reaches around
27.5 °C. However, it reached
33.8 °C in August 2010.

Precipitation amounts to
70 mm, distributed over 10 days.
The day lasts on average 15 hours and 35 minutes. So the days are long.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is of
10 kph.
September is generally a mild month. The average temperature is of
10.5 °C, with a minimum of
5.8 °C and a maximum of
15.2 °C.

On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-8.4 °C in September 1993.

On the warmest days of the month, the temperature usually reaches around
21.5 °C. However, it reached
25.2 °C in September 1991.

Precipitation amounts to
55 mm, distributed over 9 days.
The day lasts on average 12 hours and 50 minutes.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is of
11 kph.
October is generally a quite cold month. The average temperature is of
4.5 °C, with a minimum of
1.1 °C and a maximum of
7.8 °C.

On the coldest nights of the month, the temperature usually drops to around
-8 °C. However, it dropped to
-16.5 °C in October 2002.

On the warmest days of the month, the temperature usually reaches around
14.5 °C. However, it reached
18.8 °C in October 2018.

Precipitation amounts to
65 mm, distributed over 11 days.
The day lasts on average 10 hours and 0 minutes.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is of
11 kph.
November is generally a very cold month. The average temperature is of
0 °C, with a minimum of
-2.3 °C and a maximum of
2.4 °C.

On the coldest nights of the month, the temperature usually drops to around
-12.5 °C. However, it dropped to
-23.8 °C in November 1995.

On the warmest days of the month, the temperature usually reaches around
8.5 °C. However, it reached
13.2 °C in November 2015.

Precipitation amounts to
60 mm, distributed over 11 days.
The day lasts on average 7 hours and 20 minutes. So the days are short.
The average humidity is 90%. Hence, the air is normally humid.
The average wind speed is of
11 kph.
December is generally a very cold month. The average temperature is of
-3.6 °C, with a minimum of
-6.2 °C and a maximum of
-1 °C.

On the coldest nights of the month, the temperature usually drops to around
-19 °C. However, it dropped to
-31.2 °C in December 1995.

On the warmest days of the month, the temperature usually reaches around
4.5 °C. However, it reached
10.4 °C in December 2015.

Precipitation amounts to
50 mm, distributed over 12 days.
The day lasts on average 5 hours and 40 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 89%. Hence, the air is normally humid.
The average wind speed is of
12 kph.