Best year time to visit Summa

General weather information about Summa

Average annual temperature is 6.0 °C

Absolute maximum temperature: 29.6 °C

Absolute minimum temperature: -18.0 °C

Number of sunny days: 123 days

Number of rainy days: 179 days

Number of snow days: 63 days

Look at detailed online map of Summa

* Weather data for Summa Finland is based on climate observations for 2026 year

Summa air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	3.5	5.7	5.4	16.6	22.3	26.9	23.8	29.6	20.9	14.8	8.7	3.8
Average daytime temperature (°C)	-0.6	-1.0	0.6	9.2	15.1	21.0	20.3	21.3	17.8	6.9	1.5	-2.6
Average temperature (°C)	-2.5	-3.4	-2.2	4.1	10.3	16.4	16.7	17.7	15.0	4.4	-0.4	-4.6
Average night temperature (°C)	-4.7	-7.3	-5.7	-1.1	4.8	10.1	12.7	13.8	11.9	2.0	-2.9	-7.3
Absolute minimum temperature (°C)	-15.3	-18.0	-15.3	-8.6	-2.6	2.5	9.4	9.5	5.9	-3.2	-11.4	-15.1

Summa monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	7.0	10.0	13.0	15.0	18.0	19.0	18.0	16.0	14.0	11.0	8.0	6.0
Daylight mean duration (h)	6.7	9.1	11.8	14.7	17.3	18.9	18.1	15.7	12.9	10.1	7.4	5.9
Daylight minimum duration (h)	5.0	7.0	10.0	13.0	16.0	18.0	17.0	14.0	11.0	8.0	6.0	5.0
Sunshine mean duration (h)	0.6	2.5	4.9	11.7	13.3	15.5	13.3	11.0	8.1	4.5	0.9	0.4
Precipitation (mm)	106	38	84	18	31	30	108	90	92	113	75	71
Sunny days	9	11	4	23	18	14	6	8	9	7	8	6
Rainy days	14	4	12	7	13	16	25	23	21	19	15	10
Snow days	8	13	15	0	0	0	0	0	0	5	7	15

Summa - weather forecast by months

Summa weather in january Summa weather in february Summa weather in march Summa weather in april Summa weather in may Summa weather in june Summa weather in july Summa weather in august Summa weather in september Summa weather in october Summa weather in november Summa weather in december

Best time to visit Summa:

The best time to visit Summa during the most sunny months:

April — 11.7(h)
May — 13.3(h)
June — 15.5(h)
July — 13.3(h)
August — 11.0(h)

Months with the longest average daylight duration in Summa:

May — 17.3(h)
June — 18.9(h)
July — 18.1(h)
August — 15.7(h)

The largest precipitation sum in Summa is at

January — 106(mm)

July — 108(mm)

August — 90(mm)

September — 92(mm)

October — 113(mm)

Weather forecast in the closest to Summa admin centers