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Comparison

Monthly Average Temperature (°C)
YearJanFebMarAprMay_JunJulAugSepOctNovDecYear
1971-20001-4.2-4.9-1.53.39.914.817.215.810.96.21.4-2.25.6
Min
Max2		-16.5
1.4		-13.7
1.6		-9.6
2		-0.6
6.8		5.2
13		10.3
18.8		13.7
21.4		12.9
20		7.7
14.9		2
10.2		-4
5.5		-12.2
2.9		-0.4
9.9
2010-11.8Colder 7.6 than in average.-8.5Colder 3.6 than in average.-2.3Colder 0.8 than in average.4.3Warmer 1 than in average.11.7Warmer 1.8 than in average.14.7Colder 0.1 than in average.21.9Warmer 4.7 than in average.17.2Warmer 1.4 than in average.11.5Warmer 0.6 than in average.--Colder 6.2 than in average.--Colder 1.4 than in average.--Warmer 2.2 than in average.6.4Warmer 0.8 than in average.
2009-3.8Warmer 0.4 than in average.-4.1Warmer 0.8 than in average.-1.5 4.9Warmer 1.6 than in average.11.3Warmer 1.4 than in average.14.5Colder 0.3 than in average.17.0Colder 0.2 than in average.15.6Colder 0.2 than in average.12.3Warmer 1.4 than in average.3.0Colder 3.2 than in average.2.4Warmer 1 than in average.-5.4Colder 3.2 than in average.6.2Warmer 0.6 than in average.
Min Max NOAA 2009-

Monthly Average Rainfall (mm)
YearJanFebMarAprMay_JunJulAugSepOctNovDecYear
1971-20001473638363249627866736858642
Min
Max3		4.7
117		0.9
110		7
73		1.8
113		1.3
106		3.5
136		1.8
177		1.2
180		5.3
159		10.6
184		7.1
160		9.1
128		54.3
1643
201023.6Less rain 23.4 mm than in average.34.8Less rain 1.2 mm than in average.09.6Less rain 28.4 mm than in average.61.8More rain 25.8 mm than in average.82.0More rain 50 mm than in average.39.2Less rain 9.8 mm than in average.18.6Less rain 43.4 mm than in average.57.2Less rain 20.8 mm than in average.6.0Less rain 60 mm than in average.--Less rain 73 mm than in average.--Less rain 68 mm than in average.--Less rain 58 mm than in average.332.8Less rain 309.2 mm than in average.
200933.0Less rain 14 mm than in average.20.0Less rain 16 mm than in average.34.0Less rain 4 mm than in average.7.0Less rain 29 mm than in average.32.0 123.More rain 74 mm than in average.92.8More rain 30.8 mm than in average.80.2More rain 2.2 mm than in average.66.0 92.8More rain 19.8 mm than in average.84.4More rain 16.4 mm than in average.68.8More rain 10.8 mm than in average.734More rain 92 mm than in average.

Monthly Average Number of Rainy Days (count)
YearJanFebMarAprMay_JunJulAugSepOctNovDecYear
1971-20001108876891111111212113
20109 1 days less than in average.13 5 days more than in average.12 4 days more than in average.15 8 days more than in average.17 11 days more than in average.11 3 days more than in average.11 2 days more than in average.17 6 days more than in average.4 7 days less than in average.-- 11 days less than in average.-- 12 days less than in average.-- 12 days less than in average.109 4 days less than in average.
20099 1 days less than in average.9 1 days more than in average.14 6 days more than in average.2 5 days less than in average.13 7 days more than in average.10 2 days more than in average.16 7 days more than in average.11 16 5 days more than in average.19 8 days more than in average.19 7 days more than in average.17 5 days more than in average.155 42 days more than in average.

How many days
YearMax.> 25°CMax.< 0°CMin.< 0°CMin.< -15°C
1971-2000414------
2010418910432
200910------
20087------

Thermal Seasons
YearSpringSummerAutumnWinter
1971-2000123.318.524.925.11
Earliest
Latest5		1.3
18.4		26.4
6.6		4.9
17.10		31.10
23.1
201026.312.5----
Five adjacent days must meet the requirement.
Thermal Spring: Daily average temperature is between 0°C - 10°C.
Thermal Summer: Daily average temperature is above 10°C.
Thermal Autumn: Daily average temperature is between 10°C - 0°C.
Thermal Winter: Daily average temperature is below 0°C.
1 Helsinki/Kaisaniemi   2 Helsinki/Kaisaniemi 1900 - 2000   3 Helsinki/Kaisaniemi 1900 - 2008  
4 Helsinki/Vantaa   5 Helsinki/Kaisaniemi 1961 -

First and Permanent Snow
Snow Season2009-20102010-20112011-2012
First Snow4.11.2009nana
Permanent SnowDecembernana