Average temperature in December is 8 °C
Average daytime temperature is 13.5 °C
Average night temperature is 3.6 °C
Absolute maximum temperature: 21.2 °C
Absolute minimum temperature: -2 °C
Number of sunny days: 24
Number of rainy days: 7
Number of snow days:
Precipitation sum: 37 mm
* Weather data for Yachiyo Japan is based on climate observations for 2023 year
| December (°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 | 11.2 | 12.2 | 13.7 | 13.6 | 11.7 | 15.6 | 18.4 | 16.7 | 17.1 | 18.9 | 16.8 | 16.6 | 14 | 14.3 | 20 | 21.2 | 11.9 | 9.7 | 9.7 | 11.9 | 10.6 | 9 | 8.7 | 9.6 | 11.4 | 11.9 | 11.6 | 10.4 | 13.4 | 14.8 | 12.7 |
| Apparent max temperature | 8 | 9.1 | 9.4 | 10.9 | 9.2 | 13.1 | 12.9 | 14 | 14.7 | 17.8 | 13.9 | 15.1 | 10.6 | 12.8 | 16.6 | 20.8 | 8 | 4.3 | 7.1 | 9.6 | 6.4 | 4.4 | 5 | 7 | 8.4 | 7.9 | 8.8 | 7.8 | 10.5 | 12.6 | 11.4 |
| Mean temperature | 6.1 | 6.2 | 8.2 | 7.5 | 8.6 | 10.9 | 11.4 | 10 | 9.8 | 13 | 13.1 | 11.1 | 7.7 | 10 | 14.7 | 16.4 | 6.6 | 5.1 | 5.9 | 6.3 | 4.9 | 3.2 | 3.3 | 3.4 | 4.6 | 5.4 | 6 | 4.8 | 6.2 | 8.6 | 8.7 |
| Apparent mean temperature | -2.5 | -2.4 | 0.3 | -0.5 | 3.8 | 6 | 2.2 | 1 | 1.7 | 7.4 | 9.7 | 1.7 | 0.9 | 5 | 6.8 | 7.3 | -2.4 | -1.9 | -0.6 | -1.5 | -5 | -6.1 | -4.8 | -5 | -5 | -1.6 | -1.3 | -3 | -2.2 | 2.3 | 2.7 |
| Minimum temperature | 0.7 | 0.8 | 4.1 | 2.4 | 7 | 8 | 5.6 | 3.7 | 4.5 | 9.4 | 10.9 | 4.5 | 4 | 7.6 | 8.4 | 9.9 | 2.1 | 2.1 | 2.6 | 1.7 | -1.3 | -2 | -0.6 | -1.4 | -1.1 | 2 | 2.9 | 0.5 | 1.3 | 4.9 | 5.5 |
| Apparent min temperature | 3 | 3.3 | 4 | 4.7 | 5.8 | 8.7 | 6.4 | 7.3 | 7.7 | 11.2 | 11.3 | 8.7 | 4.8 | 8 | 12 | 13.2 | 1 | 0.8 | 3 | 3.5 | 0.6 | -1.5 | -0.6 | 0.1 | 1.2 | 2.3 | 2.5 | 1.7 | 3.2 | 6.2 | 6.2 |
| December | 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 | 9.9 | 9.9 | 9.9 | 9.9 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.8 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.8 | 9.8 |
| Sunshine duration (h) | 9 | 9 | 8.9 | 8 | 0.4 | 7.9 | 8.9 | 8.9 | 8.9 | 8 | 2 | 5.1 | 8.8 | 8 | 0.3 | 7.5 | 8.8 | 8 | 4.3 | 8.8 | 8.8 | 8.8 | 8.2 | 7.2 | 8.7 | 8.7 | 8 | 3.4 | 8.7 | 8 | 5.7 |
| Precipitation (mm) | 0 | 0 | 0 | 0 | 3.5 | 0 | 0 | 0 | 0 | 0 | 15.1 | 11 | 0 | 2 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.8 | 1.7 |
| Precipitation hours | 0 | 0 | 0 | 0 | 13 | 0 | 0 | 0 | 0 | 0 | 10 | 6 | 0 | 6 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 3 |
| Wind speed (m/s) | 11.3 | 11.3 | 28 | 10.6 | 17.2 | 17.8 | 45.2 | 13.5 | 10.4 | 16.3 | 24.1 | 23.2 | 19.3 | 12.7 | 53 | 46.1 | 32.7 | 19.1 | 11.2 | 10.3 | 24 | 20.9 | 11.1 | 10.3 | 13.4 | 12.2 | 15.3 | 11.8 | 12 | 11.4 | 19.2 |
In December 2023, the highest daytime temperature in Yachiyo was 21.2°C.
While the minimum temperature at night dropped to -2°C.
The average nighttime and daytime temperatures during December in Yachiyo are 3.6°C and 13.5°C respectively.
The precipitation sum in December is about 37 mm.