Monthly climate averages for Niipperi, Finland. Based on 10-year ERA5 reanalysis data.
Dfb Warm-Summer Continental
Climate OverviewNiipperi, Finland in December has cold conditions, with highs averaging around 0.4°C (33°F). Rain falls on about 13 days this month. Sea temperature stays cool at 1.8°C (35°F).
This month falls at the beginning of Winter. Cold conditions dominate the month.
Temperatures remain fairly steady throughout December, with daily highs around 0°C (32°F).
December sees fairly even rainfall, totalling about 61 mm across the month.
The warmest days tend to fall around the 18th, averaging 1.9°C (35°F).
Compared to November, this month is about 3°C cooler with 1 fewer rainy days. Temperatures begin dropping heading into January.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 0°C (33°F) mean shorter outdoor excursions with warming breaks. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -2°C / -6°C | -7°C / -11°C | 13days (63 mm) Wet | 1.2h Poor | 89% Very Muggy | 0.4 Low | Poor | View Details |
| February | -1°C / -5°C | -6°C / -10°C | 10days (53 mm) Wet | 3.5h Poor | 87% Very Muggy | 1.1 Low | Poor | View Details |
| March | 2°C / -4°C | -2°C / -9°C | 9days (38 mm) Wet | 6.7h Fair | 83% Humid | 2.3 Moderate | Poor | View Details |
| April | 8°C / 0°C | 4°C / -4°C | 9days (44 mm) Wet | 10.2h Excellent | 75% Muggy | 3.4 Moderate | Poor | View Details |
| May best | 15°C / 6°C | 13°C / 3°C | 8days (43 mm) Wet | 13.1h Excellent | 66% Muggy | 5.1 High | Good | View Details |
| June best | 20°C / 12°C | 19°C / 10°C | 10days (59 mm) Wet | 14.2h Excellent | 67% Muggy | 5.4 High | Good | View Details |
| July best | 22°C / 15°C | 21°C / 14°C | 13days (80 mm) Wet | 13.3h Excellent | 74% Muggy | 5.2 High | Excellent | View Details |
| August best | 20°C / 14°C | 19°C / 13°C | 13days (79 mm) Wet | 11h Excellent | 79% Humid | 4.3 Moderate | Excellent | View Details |
| September best | 16°C / 10°C | 14°C / 8°C | 10days (66 mm) Wet | 7.9h Good | 82% Humid | 3 Moderate | Good | View Details |
| October | 9°C / 5°C | 6°C / 1°C | 13days (66 mm) Wet | 4.3h Fair | 87% Very Muggy | 1.4 Low | Poor | View Details |
| November | 4°C / 1°C | 0°C / -4°C | 14days (60 mm) Wet | 1.6h Poor | 90% Very Muggy | 0.5 Low | Poor | View Details |
| December | 0°C / -3°C | -4°C / -8°C | 13days (61 mm) Wet | 0.8h Poor | 90% Very Muggy | 0.3 Low | Poor | View Details |
Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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