Average temperature in January is -7.2 °C
Average daytime temperature is -4.2 °C
Average night temperature is -10.6 °C
Absolute maximum temperature: 4.8 °C
Absolute minimum temperature: -18.5 °C
Number of sunny days: 3
Number of rainy days: 2
Number of snow days: 26
Precipitation sum: 70 mm
* Weather data for Iwamizawa Japan is based on climate observations for 2023 year
| January (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | -0.8 | -7.3 | -6.5 | -4.7 | -3.1 | -1.8 | -3.8 | -4.7 | -2.8 | -5.2 | 0.7 | 2.3 | 4.8 | 1.8 | -4.7 | -3.4 | -5.1 | -3.7 | -3.4 | -1.8 | -5.7 | -5.6 | -6.7 | -7 | -9.8 | -6.4 | -5.3 | -7.8 | -9 | -7.3 | -5.9 |
| Apparent max temperature | -7 | -13.8 | -12.3 | -10.4 | -7.4 | -5.3 | -7.3 | -8.6 | -6.7 | -9 | -2.3 | -0.9 | 2.3 | -2 | -9.7 | -7.7 | -10.4 | -9.6 | -6.5 | -5.8 | -10.5 | -12.2 | -10.8 | -12.4 | -16.8 | -11.2 | -9.3 | -13.6 | -13.8 | -12.1 | -12.8 |
| Mean temperature | -5.4 | -8.4 | -7.7 | -7.8 | -5.1 | -6.3 | -8.1 | -7.7 | -5.8 | -7.7 | -2.3 | -1.9 | 2.6 | -3.5 | -6.8 | -6.8 | -8.6 | -8.5 | -5.3 | -4.8 | -7.6 | -8.2 | -8.4 | -11.1 | -10.8 | -7.7 | -10 | -10.4 | -13.6 | -9.7 | -8.8 |
| Apparent mean temperature | -16.7 | -16.3 | -15.4 | -17.2 | -13.4 | -15.8 | -19.2 | -18.8 | -15.1 | -16.1 | -10.8 | -10.6 | -3.1 | -14.7 | -13.7 | -13.7 | -18.1 | -16.8 | -13.5 | -16.3 | -15 | -15.9 | -16.2 | -20.7 | -21.6 | -15.6 | -20.1 | -18.9 | -23.5 | -19 | -16.8 |
| Minimum temperature | -8.6 | -9.9 | -9.3 | -11.3 | -8 | -11.3 | -14.1 | -14 | -9.5 | -11.1 | -5.4 | -6.2 | 0.8 | -8.1 | -8.5 | -9 | -13.3 | -11.7 | -8.5 | -11.2 | -9.5 | -11.2 | -11.8 | -14.3 | -11.8 | -10.9 | -15.1 | -12.4 | -18.5 | -13.8 | -10.8 |
| Apparent min temperature | -12.3 | -15.1 | -13.8 | -13.2 | -10.5 | -10.7 | -12.3 | -12 | -10.6 | -12.5 | -6.4 | -6.4 | -1.6 | -9.3 | -11.3 | -11.3 | -13.6 | -13.4 | -10.3 | -10.5 | -13.4 | -13.8 | -12.9 | -17.7 | -19.6 | -13.4 | -14.5 | -16.8 | -18.6 | -15.4 | -14.7 |
| January | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 9 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.2 | 9.2 | 9.2 | 9.2 | 9.3 | 9.3 | 9.3 | 9.3 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.6 | 9.6 | 9.6 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.9 | 9.9 |
| Sunshine duration (h) | 7.3 | 7.1 | 5 | 4.9 | 4.1 | 7.7 | 7.4 | 7.6 | 4.7 | 3.7 | 7.6 | 8 | 5.4 | 5.9 | 7 | 6.9 | 6.9 | 7.9 | 7.8 | 8.4 | 6.9 | 7.2 | 4.2 | 2.4 | 1.8 | 6.6 | 7.5 | 7.8 | 8.2 | 8.2 | 8.5 |
| Precipitation (mm) | 2.2 | 6.2 | 5.9 | 6.5 | 1.7 | 0.8 | 0.3 | 0.3 | 2.1 | 2 | 0 | 0 | 0.5 | 0 | 3.1 | 2.2 | 0.5 | 0.1 | 6 | 2.8 | 3.3 | 2.7 | 4.3 | 2.8 | 3.6 | 4.3 | 0.4 | 2.9 | 0.3 | 0.9 | 1 |
| Precipitation hours | 17 | 24 | 24 | 19 | 14 | 8 | 3 | 3 | 12 | 13 | 0 | 0 | 4 | 0 | 11 | 13 | 4 | 1 | 9 | 7 | 23 | 15 | 10 | 15 | 23 | 18 | 2 | 8 | 1 | 7 | 8 |
| Wind speed (m/s) | 32 | 31.6 | 28.5 | 25.2 | 32.5 | 15.2 | 9.8 | 11.2 | 20.1 | 15.1 | 19.7 | 27.7 | 27.2 | 26.4 | 19.8 | 16.8 | 17.8 | 21.4 | 21.1 | 34.2 | 26.3 | 34.9 | 22.4 | 33.4 | 43.5 | 26.8 | 10.2 | 25.8 | 15.8 | 19.5 | 25.6 |
In January 2023, the highest daytime temperature in Iwamizawa was 4.8°C.
While the minimum temperature at night dropped to -18.5°C.
The average nighttime and daytime temperatures during January in Iwamizawa are -10.6°C and -4.2°C respectively.
The precipitation sum in January is about 70 mm.