Average temperature in January is 13 °C
Average daytime temperature is 14.3 °C
Average night temperature is 11.5 °C
Absolute maximum temperature: 19.5 °C
Absolute minimum temperature: 4.1 °C
Number of sunny days: 5
Number of rainy days: 26
Number of snow days:
Precipitation sum: 142 mm
* Weather data for Hachijō 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 | 14.4 | 13.6 | 13.2 | 12.6 | 12.7 | 13.1 | 14 | 15.4 | 16.4 | 13.2 | 14.6 | 17.4 | 18.5 | 19.5 | 18.5 | 17.1 | 15.2 | 15.9 | 14.7 | 14.6 | 12.5 | 14.2 | 15 | 14.7 | 9.4 | 12.7 | 13.9 | 10.4 | 11.8 | 12 | 12.3 |
| Apparent max temperature | 6.7 | 6.6 | 6 | 5.1 | 5.5 | 8 | 9.6 | 9.8 | 9.5 | 10.2 | 9.7 | 14 | 15.1 | 17.5 | 19 | 13.7 | 14.2 | 11.6 | 10.7 | 8.6 | 8.3 | 12 | 13.4 | 13.7 | 1.6 | 6.1 | 11.1 | 3.9 | 4 | 3.6 | 7.1 |
| Mean temperature | 13.4 | 12.9 | 12.2 | 12 | 12 | 12.3 | 13 | 14.4 | 15.1 | 12.6 | 14.1 | 16.5 | 17.3 | 18.6 | 17.8 | 14.5 | 14.2 | 14.1 | 13.6 | 13.4 | 11.3 | 13.5 | 13.5 | 10 | 7.4 | 11.6 | 10.8 | 9.2 | 10.7 | 10.8 | 11 |
| Apparent mean temperature | 5.4 | 4.8 | 4.1 | 3.1 | 3.6 | 5.8 | 5.4 | 7.8 | 3.2 | 1.9 | 7.7 | 10.2 | 11.5 | 12.8 | 13.1 | 7.2 | 8.7 | 6.5 | 7 | 3.3 | 4 | 7.7 | 8 | -6.9 | -5.7 | 2.5 | -0.8 | -0.7 | 2.1 | 1.3 | 1.5 |
| Minimum temperature | 12.6 | 12 | 11.5 | 11.3 | 11.1 | 11.5 | 11.8 | 13.8 | 12.3 | 12.1 | 12.9 | 15 | 16 | 17.6 | 17 | 12.6 | 13 | 13.1 | 12.5 | 10.7 | 10.1 | 11.9 | 11.6 | 4.1 | 4.9 | 10.3 | 7.8 | 7.3 | 9.6 | 9.4 | 9.7 |
| Apparent min temperature | 5.9 | 5.7 | 5 | 4.1 | 4.5 | 6.8 | 7.8 | 8.8 | 8 | 6.6 | 8.8 | 12 | 12.9 | 14.5 | 16.3 | 10.3 | 11.5 | 8.6 | 8.7 | 5.5 | 6.1 | 10.1 | 9.9 | 0.6 | -1.6 | 4 | 4.5 | 2.2 | 3 | 2.3 | 4.1 |
| 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) | 10 | 10 | 10 | 10 | 10.1 | 10.1 | 10.1 | 10.1 | 10.1 | 10.1 | 10.1 | 10.2 | 10.2 | 10.2 | 10.2 | 10.2 | 10.2 | 10.3 | 10.3 | 10.3 | 10.3 | 10.3 | 10.4 | 10.4 | 10.4 | 10.4 | 10.5 | 10.5 | 10.5 | 10.5 | 10.6 |
| Sunshine duration (h) | 8.9 | 8.5 | 8.9 | 9 | 8.4 | 8.7 | 3.8 | 8.4 | 9.1 | 8.9 | 9.2 | 9.2 | 6.7 | 0.6 | 8.4 | 1.3 | 5.4 | 3.9 | 8.4 | 6.9 | 5.3 | 8.6 | 0.9 | 3.4 | 8.4 | 6.3 | 1.7 | 9.6 | 5.5 | 9.7 | 8.6 |
| Precipitation (mm) | 0 | 0.5 | 1 | 3.5 | 0.9 | 1.8 | 5.9 | 0 | 1.1 | 0 | 0 | 0 | 2.4 | 27.1 | 1 | 6.5 | 5.8 | 1 | 14.9 | 0.1 | 3.1 | 2.2 | 10.3 | 8.7 | 4.7 | 1.4 | 28.1 | 5.4 | 2.5 | 1.3 | 1.2 |
| Precipitation hours | 0 | 5 | 8 | 19 | 7 | 13 | 14 | 0 | 4 | 0 | 0 | 0 | 9 | 22 | 6 | 20 | 12 | 4 | 19 | 1 | 9 | 4 | 16 | 22 | 20 | 10 | 23 | 19 | 15 | 12 | 10 |
| Wind speed (m/s) | 49.9 | 45.6 | 44.4 | 49.3 | 47.4 | 37 | 40 | 37.9 | 58 | 63 | 31 | 34.6 | 42.5 | 54.1 | 36.6 | 37.2 | 26.4 | 42.2 | 46.3 | 57.5 | 42.3 | 29.9 | 39.4 | 73.2 | 61.1 | 53.7 | 55.7 | 44.9 | 49.9 | 55.8 | 46.6 |
In January 2023, the highest daytime temperature in Hachijō was 19.5°C.
While the minimum temperature at night dropped to 4.1°C.
The average nighttime and daytime temperatures during January in Hachijō are 11.5°C and 14.3°C respectively.
The precipitation sum in January is about 142 mm.