The city is located in north-central Finland, in the northernmost part of the Gulf of Bothnia (called Perämeri), which can freeze in winter. It is useful to recall that sea water freezes at about -2 °C (28.5 °F).
We are at the 65th parallel, therefore south of the Polar Circle. The
, when it doesn't get completely dark even at midnight, occur from April 25th to August 18th.
, there can be cold spells of arctic origin. The coldest record is -41.5 °C (-42.7 °F) and was set in February 1966.
, there can be short hot periods. The highest record is 33.2 °C (91.8 °F) and was set in July 2018.
, 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
-8.4 °C, with a minimum of
-12 °C and a maximum of
-4.9 °C.
On the coldest nights of the month, the temperature usually drops to around
-26.5 °C. However, it dropped to
-36.6 °C in January 1999.
On the warmest days of the month, the temperature usually reaches around
3.5 °C. However, it reached
7.2 °C in January 2002.
Precipitation amounts to
30 mm, distributed over 9 days.
The day lasts on average 5 hours and 10 minutes. So the days are short.
There is an average of 1 hour of sunshine per day. So, the sun shines 15% of the time.
The average humidity is 88%. Hence, the air is normally humid.
The average wind speed is of
12.7 kph.
The average sea temperature is of
0.7 °C. Therefore, the sea is very cold for swimming.
February, the coldest month of the year, is generally a freezing cold month. The average temperature is of
-8.7 °C, with a minimum of
-12.4 °C and a maximum of
-4.9 °C.
On the coldest nights of the month, the temperature usually drops to around
-25.5 °C. However, it dropped to
-34.3 °C in February 2011.
On the warmest days of the month, the temperature usually reaches around
3.5 °C. However, it reached
6.3 °C in February 2017.
Precipitation amounts to
30 mm, distributed over 8 days.
The day lasts on average 8 hours and 30 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is of
12.3 kph.
The average sea temperature is of
-0.4 °C. Therefore, the sea is very cold for swimming.
March is generally a very cold month. The average temperature is of
-4.4 °C, with a minimum of
-8.5 °C and a maximum of
-0.2 °C.
On the coldest nights of the month, the temperature usually drops to around
-20.5 °C. However, it dropped to
-28.3 °C in March 2010.
On the warmest days of the month, the temperature usually reaches around
6.5 °C. However, it reached
11.5 °C in March 2016.
Precipitation amounts to
25 mm, distributed over 7 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 37% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is of
12.9 kph.
The average sea temperature is of
-0.7 °C. Therefore, the sea is very cold for swimming.
April is generally a cold month. The average temperature is of
1.7 °C, with a minimum of
-2.6 °C and a maximum of
6 °C.
On the coldest nights of the month, the temperature usually drops to around
-11 °C. However, it dropped to
-19.2 °C in April 1997.
On the warmest days of the month, the temperature usually reaches around
15 °C. However, it reached
20.3 °C in April 1999.
Precipitation amounts to
25 mm, distributed over 6 days.
The day lasts on average 15 hours and 25 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of
12.1 kph.
The average sea temperature is of
-0.1 °C. Therefore, the sea is very cold for swimming.
May is generally a quite mild month. The average temperature is of
8 °C, with a minimum of
3.2 °C and a maximum of
12.9 °C.
On the coldest nights of the month, the temperature usually drops to around
-3 °C. However, it dropped to
-6.7 °C in May 2007.
On the warmest days of the month, the temperature usually reaches around
23 °C. However, it reached
29.9 °C in May 2014.
Precipitation amounts to
40 mm, distributed over 8 days.
The day lasts on average 19 hours and 0 minutes. So the days are very long.
There are on average 9 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 65%.
The average wind speed is of
13 kph.
The average sea temperature is of
2.3 °C. Therefore, the sea is very cold for swimming.
June is generally a mild month. The average temperature is of
13.4 °C, with a minimum of
8.8 °C and a maximum of
18 °C.
On the coldest nights of the month, the temperature usually drops to around
2.5 °C. However, it dropped to
-1 °C in June 2009.
On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
32.3 °C in June 2019.
Precipitation amounts to
50 mm, distributed over 8 days.
The day lasts on average 21 hours and 40 minutes. So the days are very long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 10 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 65%.
The average wind speed is of
13 kph.
The average sea temperature is of
6.8 °C. Therefore, the sea is very cold for swimming.
July, the warmest month of the year, is generally a very mild month. The average temperature is of
16.7 °C, with a minimum of
12.1 °C and a maximum of
21.3 °C.
On the coldest nights of the month, the temperature usually drops to around
6.5 °C. However, it dropped to
3.6 °C in July 2017.
On the warmest days of the month, the temperature usually reaches around
28 °C. However, it reached
33.2 °C in July 2018.
Precipitation amounts to
75 mm, distributed over 10 days.
The day lasts on average 20 hours and 0 minutes. So the days are very long.
There are on average 9 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of
11.4 kph.
The average sea temperature is of
12 °C. Therefore, the sea is very cold for swimming.
August is generally a very mild month. The average temperature is of
14.6 °C, with a minimum of
10.2 °C and a maximum of
19 °C.
On the coldest nights of the month, the temperature usually drops to around
3.5 °C. However, it dropped to
0.3 °C in August 2019.
On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
30.5 °C in August 2018.
Precipitation amounts to
65 mm, distributed over 10 days.
The day lasts on average 16 hours and 25 minutes. So the days are long.
There are on average 7 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is of
11.2 kph.
The average sea temperature is of
13.6 °C. Therefore, the sea is very cold for swimming.
September is generally a mild month. The average temperature is of
9.5 °C, with a minimum of
5.7 °C and a maximum of
13.3 °C.
On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-5.5 °C in September 1993.
On the warmest days of the month, the temperature usually reaches around
20 °C. However, it reached
25.4 °C in September 2019.
Precipitation amounts to
45 mm, distributed over 8 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
11.9 kph.
The average sea temperature is of
11.5 °C. Therefore, the sea is very cold for swimming.
October is generally a cold month. The average temperature is of
3.1 °C, with a minimum of
0.4 °C and a maximum of
5.8 °C.
On the coldest nights of the month, the temperature usually drops to around
-9.5 °C. However, it dropped to
-20.1 °C in October 1992.
On the warmest days of the month, the temperature usually reaches around
12 °C. However, it reached
20.5 °C in October 2018.
Precipitation amounts to
50 mm, distributed over 10 days.
The day lasts on average 9 hours and 30 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is of
12.2 kph.
The average sea temperature is of
8.1 °C. Therefore, the sea is very cold for swimming.
November is generally a very cold month. The average temperature is of
-1.9 °C, with a minimum of
-4.3 °C and a maximum of
0.5 °C.
On the coldest nights of the month, the temperature usually drops to around
-15.5 °C. However, it dropped to
-24.5 °C in November 1995.
On the warmest days of the month, the temperature usually reaches around
7 °C. However, it reached
11.2 °C in November 2015.
Precipitation amounts to
40 mm, distributed over 10 days.
The day lasts on average 6 hours and 5 minutes. So the days are short.
There is an average of 1 hour of sunshine per day. So, the sun shines 15% of the time.
The average humidity is 90%. Hence, the air is normally humid.
The average wind speed is of
12.8 kph.
The average sea temperature is of
5.1 °C. Therefore, the sea is very cold for swimming.
December is generally a freezing cold month. The average temperature is of
-5.7 °C, with a minimum of
-8.7 °C and a maximum of
-2.7 °C.
On the coldest nights of the month, the temperature usually drops to around
-22 °C. However, it dropped to
-37.2 °C in December 2002.
On the warmest days of the month, the temperature usually reaches around
4.5 °C. However, it reached
8.2 °C in December 2013.
Precipitation amounts to
40 mm, distributed over 9 days.
The day lasts on average 3 hours and 50 minutes. So the days are very short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 0.5 hours of sunshine per day. So, the sun shines 7% of the time.
The average humidity is 90%. Hence, the air is normally humid.
The average wind speed is of
12.8 kph.
The average sea temperature is of
2.7 °C. Therefore, the sea is very cold for swimming.