Climate Insights for Ii

Oulunkaari, Pohjois-Pohjanmaa, Finland

Hottest
July
19°C peak
Coldest
January
-10°C low
Wettest
August
102mm rain
Best to Visit
July
Mild temps & low rain

Climate Overview

The climate in Ii is cool. The average annual temperature is 4°C and approximately 774mm of precipitation falls per year. Ii receives a notable amount of rainfall throughout the year, including during its driest month. Ii is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, March, when temperatures can drop to -10°C. Ii experiences heavy snowfall, typically from January through December.

Temperature

-10° -5° 10° 15° 20° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: -5° Average: -8° Min: -10° Feb Max: -4° Average: -7° Min: -9° Mar Max: -2° Average: -4° Min: -7° Apr Max: 3° Average: 0° Min: -3° May Max: 9° Average: 6° Min: 3° Jun Max: 15° Average: 13° Min: 10° Jul Max: 19° Average: 17° Min: 14° Aug Max: 17° Average: 15° Min: 12° Sep Max: 13° Average: 11° Min: 8° Oct Max: 6° Average: 4° Min: 2° Nov Max: 1° Average: 0° Min: -2° Dec Max: -1° Average: -3° Min: -5°
Max
Average
Min

Temperatures in Ii vary considerably across the year, with a 29°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 19°C with a mean of 17°C. The coldest month is January, when overnight lows fall to -10°C and the daily average is -8°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between May and June, with a 7°C shift in average temperatures.

Precipitation

0mm 25mm 50mm 75mm 100mm 125mm 150mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 49mm Snow: 42mm Feb Precipitation: 52mm Snow: 43mm Mar Precipitation: 45mm Snow: 40mm Apr Precipitation: 42mm Snow: 21mm May Precipitation: 45mm Snow: 5mm Jun Precipitation: 54mm Snow: 0mm Jul Precipitation: 75mm Snow: 0mm Aug Precipitation: 102mm Snow: 0mm Sep Precipitation: 87mm Snow: 0mm Oct Precipitation: 74mm Snow: 9mm Nov Precipitation: 81mm Snow: 36mm Dec Precipitation: 70mm Snow: 53mm
Precipitation
Snow

Ii is a relatively dry area, receiving approximately 774mm of precipitation annually, which averages out to around 64mm per month. The wettest month is August, averaging 102mm of rainfall. September and November also tend to see above-average precipitation. The driest month is April, with just 42mm. That's 60mm less than August, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Ii receives heavy snowfall, accumulating around 250cm annually from January through December. The snowiest month is December, with approximately 53cm. Winter travel should account for significant snow cover.

Wind

0km/h 5km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 5km/h Feb Wind Speed: 4km/h Mar Wind Speed: 5km/h Apr Wind Speed: 4km/h May Wind Speed: 4km/h Jun Wind Speed: 4km/h Jul Wind Speed: 3km/h Aug Wind Speed: 4km/h Sep Wind Speed: 5km/h Oct Wind Speed: 4km/h Nov Wind Speed: 5km/h Dec Wind Speed: 5km/h
Wind Speed

Ii is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

89 days until Autumn

It is currently summer in Ii, which began on June 21, 2026. Ii is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 19°C, while the coldest stretch bottoms out in January near -10°C. Autumn is next, beginning on September 23, 2026 — 89 days from now.

Spring

Temperatures range from -7 to 9°C. Rainfall is relatively light, with around 131mm over the season and a monthly average of 44mm. Winds are generally light, averaging 4km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.

Summer

Temperatures range from 10 to 19°C. Precipitation is moderate at around 230mm for the season, averaging 77mm per month. Winds are generally light, averaging 4km/h. Comfortable clothing with a light layer for cooler evenings is all you need.

Autumn

Temperatures range from -2 to 13°C. Precipitation is moderate at around 241mm for the season, averaging 80mm per month. Expect around 46cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from -10 to -1°C. Precipitation is moderate at around 171mm for the season, averaging 57mm per month. Expect around 138cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.

Best Time to Visit

Jan -8°
Feb -7°
Mar -4°
Apr
May
Jun 13°
Jul 17°
Aug 15°
Sep 11°
Oct
Nov
Dec -3°

The best time to visit Ii is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 75mm per month. By contrast, January can be quite cold with temperatures dropping to -10°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

Monthly Climate Data

The table below shows monthly climate averages for Ii based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
-10 °C
-5 °C
5 km/h
49 mm
42 cm
Feb
-9 °C
-4 °C
4 km/h
52 mm
43 cm
Mar
-7 °C
-2 °C
5 km/h
45 mm
40 cm
Apr
-3 °C
3 °C
4 km/h
42 mm
21 cm
May
3 °C
9 °C
4 km/h
45 mm
5 cm
Jun Current
10 °C
15 °C
4 km/h
54 mm
0 cm
Jul
14 °C
19 °C
3 km/h
75 mm
0 cm
Aug
12 °C
17 °C
4 km/h
102 mm
0 cm
Sep
8 °C
13 °C
5 km/h
87 mm
0 cm
Oct
2 °C
6 °C
4 km/h
74 mm
9 cm
Nov
-2 °C
1 °C
5 km/h
81 mm
36 cm
Dec
-5 °C
-1 °C
5 km/h
70 mm
53 cm
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