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Helsinki Climate Guide
Finland
Metric | Imperial    Bars | Symbols
Maximum Daytime Temperature (°C)
Minimum Night-time Temperature (°C)
1
1 °C (34°F) Maximum Daytime Temperature in March
7
7 °C (45°F) Maximum Daytime Temperature in April
15
15 °C (59°F) Maximum Daytime Temperature in May
20
20 °C (68°F) Maximum Daytime Temperature in June
21
21 °C (70°F) Maximum Daytime Temperature in July
20
20 °C (68°F) Maximum Daytime Temperature in August
14
14 °C (57°F) Maximum Daytime Temperature in September
9
9 °C (48°F) Maximum Daytime Temperature in October
3
3 °C (37°F) Maximum Daytime Temperature in November
J F M A M J J A S O N D
5
5 °C (41°F) Minimum Night-time Temperature in May
10
10 °C (50°F) Minimum Night-time Temperature in June
12
12 °C (54°F) Minimum Night-time Temperature in July
11
11 °C (52°F) Minimum Night-time Temperature in August
7
7 °C (45°F) Minimum Night-time Temperature in September
3
3 °C (37°F) Minimum Night-time Temperature in October
J F M A M J J A S O N D
-4 °C (25°F) Maximum Daytime Temperature in January
-4
-4 °C (25°F) Maximum Daytime Temperature in February
-4
-1 °C (30°F) Maximum Daytime Temperature in December
-1
-10 °C (14°F) Minimum Night-time Temperature in January
-10
-10 °C (14°F) Minimum Night-time Temperature in February
-10
-6 °C (21°F) Minimum Night-time Temperature in March
-6
-1 °C (30°F) Minimum Night-time Temperature in April
-1
-2 °C (28°F) Minimum Night-time Temperature in November
-2
-7 °C (19°F) Minimum Night-time Temperature in December
-7
Hours of Sunshine
Hours of Daylight
1
1 Hour of Sunshine (13% of Daylight Hours) in January
2
2 Hours of Sunshine (22% of Daylight Hours) in February
4
4 Hours of Sunshine (32% of Daylight Hours) in March
6
6 Hours of Sunshine (38% of Daylight Hours) in April
8
8 Hours of Sunshine (49% of Daylight Hours) in May
9
9 Hours of Sunshine (50% of Daylight Hours) in June
8
8 Hours of Sunshine (47% of Daylight Hours) in July
7
7 Hours of Sunshine (43% of Daylight Hours) in August
4
4 Hours of Sunshine (33% of Daylight Hours) in September
3
3 Hours of Sunshine (26% of Daylight Hours) in October
1
1 Hour of Sunshine (14% of Daylight Hours) in November
1
1 Hour of Sunshine (12% of Daylight Hours) in December
J F M A M J J A S O N D
7
7 Hours of Daylight in January
9
9 Hours of Daylight in February
12
12 Hours of Daylight in March
15
15 Hours of Daylight in April
17
17 Hours of Daylight in May
19
19 Hours of Daylight in June
18
18 Hours of Daylight in July
16
16 Hours of Daylight in August
13
13 Hours of Daylight in September
10
10 Hours of Daylight in October
7
7 Hours of Daylight in November
6
6 Hours of Daylight in December
J F M A M J J A S O N D
Days with some Rain
Monthly Rainfall (mm)
20
20 Days with some Rain in January
16
16 Days with some Rain in February
16
16 Days with some Rain in March
13
13 Days with some Rain in April
11
11 Days with some Rain in May
11
11 Days with some Rain in June
14
14 Days with some Rain in July
16
16 Days with some Rain in August
18
18 Days with some Rain in September
18
18 Days with some Rain in October
21
21 Days with some Rain in November
21
21 Days with some Rain in December
J F M A M J J A S O N D
43
43 mm (1.7 inches) Monthly Rainfall in January
33
33 mm (1.3 inches) Monthly Rainfall in February
35
35 mm (1.4 inches) Monthly Rainfall in March
37
37 mm (1.5 inches) Monthly Rainfall in April
33
33 mm (1.3 inches) Monthly Rainfall in May
42
42 mm (1.7 inches) Monthly Rainfall in June
67
67 mm (2.6 inches) Monthly Rainfall in July
77
77 mm (3.0 inches) Monthly Rainfall in August
73
73 mm (2.9 inches) Monthly Rainfall in September
72
72 mm (2.8 inches) Monthly Rainfall in October
70
70 mm (2.8 inches) Monthly Rainfall in November
58
58 mm (2.3 inches) Monthly Rainfall in December
J F M A M J J A S O N D
Heat & Humidity / Chance of Frost
UV Index (Maximum)
27
27 Days with Frost in January
27
27 Days with Frost in February
27
27 Days with Frost in March
21
21 Days with Frost in April
8
8 Days with Frost in May
-
No Heat & Humidity or Frost in June
-
No Heat & Humidity or Frost in July
-
No Heat & Humidity or Frost in August
5
5 Days with Frost in September
12
12 Days with Frost in October
19
19 Days with Frost in November
25
25 Days with Frost in December
J F M A M J J A S O N D
0
UV 0 (None) in January
0
UV 0 (None) in February
1
UV 1 (Low) in March
3
UV 3 (Moderate) in April
4
UV 4 (Moderate) in May
5
UV 5 (Moderate) in June
5
UV 5 (Moderate) in July
4
UV 4 (Moderate) in August
3
UV 3 (Moderate) in September
1
UV 1 (Low) in October
0
UV 0 (None) in November
0
UV 0 (None) in December
J F M A M J J A S O N D
Sea Temperature (°C)
2
2 °C (36°F) Sea Temperature in January
1
1 °C (34°F) Sea Temperature in February
1
1 °C (34°F) Sea Temperature in March
2
2 °C (36°F) Sea Temperature in April
5
5 °C (41°F) Sea Temperature in May
9
9 °C (48°F) Sea Temperature in June
15
15 °C (59°F) Sea Temperature in July
17
17 °C (63°F) Sea Temperature in August
14
14 °C (57°F) Sea Temperature in September
10
10 °C (50°F) Sea Temperature in October
7
7 °C (45°F) Sea Temperature in November
3
3 °C (37°F) Sea Temperature in December
J F M A M J J A S O N D
Helsinki Climate Guide (Historical Weather Averages), Finland
Elev: 0 m   Long: 024°56'E   Lat: 60°10'N
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