Last updated: August 23, 2025
In December, the average temperature in Iwaizumi, Japan hovers around 0°C (33°F), with a chill that can drop to a minimum of -10°C (15°F) and occasionally rise to a maximum of 15°C (59°F). Expect 63 mm (2.5 in) of precipitation spread over 11 days, contributing to an average humidity of 80%. Be prepared for a brisk and damp month!
In December in Iwaizumi, the average temperature is 0°C (33°F). Maximums can reach 15°C (59°F) and minimums can be as low as -10°C (15°F). Be prepared for a range of temperatures during your travels, from chilly days to cooler nights.
In Iwaizumi in December, the precipitation amount is 63 mm (2.5 in) during a total of 11 days.
In Iwaizumi in December humidity is 80%. With an average temperature of 0°C (33°F), this humidity feels like an uncomfortable chill that clings to your skin, making travel feel damp and frigid, as if each breath is infused with brisk moisture that can seep through your layers.
In Iwaizumi in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Iwaizumi, you can check the information here.
UV Risk Categories
Weather in Iwaizumi varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Iwaizumi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 49 mm (1.9 inches) | 80% | moderate |
| February Weather | -2°C (29°F) | 67 mm (2.6 inches) | 79% | moderate |
| March Weather | 3°C (37°F) | 102 mm (4.0 inches) | 77% | high |
| April Weather | 7°C (45°F) | 119 mm (4.7 inches) | 75% | very high |
| May Weather | 13°C (55°F) | 106 mm (4.2 inches) | 80% | very high |
| June Weather | 16°C (61°F) | 108 mm (4.3 inches) | 87% | extreme |
| July Weather | 20°C (69°F) | 178 mm (7.0 inches) | 92% | very high |
| August Weather | 22°C (71°F) | 199 mm (7.8 inches) | 92% | extreme |
| September Weather | 18°C (65°F) | 157 mm (6.2 inches) | 86% | very high |
| October Weather | 12°C (55°F) | 200 mm (7.9 inches) | 82% | high |
| November Weather | 6°C (44°F) | 45 mm (1.8 inches) | 79% | moderate |
| December Weather | 0°C (33°F) | 63 mm (2.5 inches) | 80% | moderate |