Last updated: August 23, 2025
In Koeylioe, Finland, the average temperature in December hovers around -1°C (30°F), with extremes dipping to a chilly -20°C (-4°F) and peaking at a mild 6°C (44°F). Expect 66 mm (2.6 in) of precipitation spread over 13 days, contributing to an average humidity of a brisk 89%. Whether bundled up or dodging raindrops, this month brings its own unique charm!
In December in Koeylioe, the average temperature is -1°C (30°F), with maximums reaching 6°C (44°F) and minimums dropping as low as -20°C (-4°F). Travelers should be prepared for cold weather and dress accordingly to fully enjoy their visit.
In Koeylioe in December, the total precipitation amount is 66 mm (2.6 in) spread over the course of 13 days.
In Koeylioe in December humidity is 89%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that wraps around you, making outdoor travel uncomfortable and brisk, as the cold air sharpens the dampness, leaving you feeling colder than the thermometer suggests.
In Koeylioe in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Koeylioe.
UV Risk Categories
Weather in Koeylioe varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Koeylioe, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 44 mm (1.7 inches) | 92% | low |
| February Weather | -4°C (25°F) | 41 mm (1.6 inches) | 90% | low |
| March Weather | 0°C (31°F) | 43 mm (1.7 inches) | 89% | moderate |
| April Weather | 4°C (40°F) | 38 mm (1.5 inches) | 85% | moderate |
| May Weather | 10°C (50°F) | 50 mm (2.0 inches) | 77% | moderate |
| June Weather | 16°C (61°F) | 55 mm (2.2 inches) | 78% | high |
| July Weather | 18°C (64°F) | 91 mm (3.6 inches) | 78% | high |
| August Weather | 16°C (61°F) | 91 mm (3.6 inches) | 79% | moderate |
| September Weather | 11°C (53°F) | 62 mm (2.4 inches) | 86% | moderate |
| October Weather | 6°C (44°F) | 74 mm (2.9 inches) | 90% | low |
| November Weather | 3°C (37°F) | 53 mm (2.1 inches) | 91% | low |
| December Weather | -1°C (30°F) | 66 mm (2.6 inches) | 89% | low |