Monthly climate averages for Uster, Switzerland. Based on 10-year ERA5 reanalysis data.
Cfb Oceanic
Climate OverviewUster, Switzerland in December has cold conditions, with highs averaging around 6°C (43°F). Rain falls on about 15 days this month, totalling around 121 mm.
This month falls at the beginning of Winter. Cold conditions dominate the month.
Temperatures remain fairly steady throughout December, with daily highs around 6°C (43°F).
Rainfall is heaviest during the first third of the month, while the middle tends to be drier.
The warmest days tend to fall around the 31th, averaging 7.1°C (45°F).
Compared to November, this month is about 3°C cooler with 1 more rainy days.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 6°C (43°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.
1 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 | 5°C / -1°C | 2°C / -5°C | 15days (131 mm) Wet | 5.5h Fair | 83% Humid | 1.5 Low | Poor | View Details |
| February | 8°C / -1°C | 5°C / -4°C | 12days (89 mm) Wet | 6.8h Fair | 79% Humid | 2.2 Moderate | Poor | View Details |
| March | 11°C / 1°C | 8°C / -2°C | 14days (97 mm) Wet | 8.5h Good | 76% Humid | 3.4 Moderate | Poor | View Details |
| April | 14°C / 4°C | 13°C / 1°C | 14days (111 mm) Wet | 10.2h Excellent | 74% Muggy | 4.9 Moderate | Fair | View Details |
| May | 18°C / 8°C | 17°C / 6°C | 19days (170 mm) Wet | 10.3h Excellent | 77% Humid | 5.6 High | Wet | View Details |
| June best | 23°C / 13°C | 24°C / 13°C | 16days (168 mm) Wet | 11.7h Excellent | 75% Muggy | 6.5 High | Excellent | View Details |
| July best | 24°C / 15°C | 25°C / 16°C | 16days (145 mm) Wet | 11.7h Excellent | 74% Muggy | 6.4 High | Excellent | View Details |
| August best | 24°C / 15°C | 26°C / 16°C | 14days (160 mm) Wet | 10.5h Excellent | 76% Humid | 5.6 High | Excellent | View Details |
| September best | 20°C / 12°C | 20°C / 11°C | 14days (129 mm) Wet | 9.1h Good | 81% Humid | 4.2 Moderate | Excellent | View Details |
| October best | 16°C / 7°C | 15°C / 6°C | 13days (108 mm) Wet | 7.2h Good | 83% Humid | 2.8 Moderate | Good | View Details |
| November | 9°C / 2°C | 7°C / 0°C | 14days (104 mm) Wet | 5.7h Fair | 85% Humid | 1.6 Low | Poor | View Details |
| December | 6°C / 0°C | 4°C / -3°C | 15days (121 mm) Wet | 4.9h Fair | 85% Humid | 1.2 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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