The climate of Sodankylä is cold continental, with freezing winters and mild summers.
The town is located in northern Finland, in Lapland. The latitude (67° 25' N) shows that we are just north of the Polar Circle. The midnight sun can be observed from May 31 to July 14, and the white nights from April 18 to August 26. The sun does not rise (polar night) for a short period, from 20 to 23 December.
The average temperature of the coldest month (January) is of -14.1 °C (7 °F), that of the warmest month (July) is of 14.7 °C (58 °F). In January 1999, the temperature dropped to -49.5 °C (-57 °F), while in July 2018, it reached 32 °C (89.5 °F). Here are the average temperatures.
Sodankylä - Average temperatures
Min (°C)-19-18-13-7061072-3-11-16
Max (°C)-10-8-2410172016103-4-7
Min (°F)-20919324350453627123
Max (°F)141828395063686150372519

Precipitation amounts to 525 millimeters (20.7 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest months (February, March, April) to 75 mm (3 in) in the wettest (July). Here is the average precipitation.
Sodankylä - Average precipitation

On average, there are around 1,540 sunshine hours per year. Here are the average sunshine hours per day.
Sodankylä - Sunshine


Best Time

The best time to visit Sodankylä is the summer, 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.