Average temperature in December is -4.8 °C
Average daytime temperature is 1.7 °C
Average night temperature is -9.5 °C
Absolute maximum temperature: 8.3 °C
Absolute minimum temperature: -19.7 °C
Number of sunny days: 20
Number of rainy days: 1
Number of snow days: 10
Precipitation sum: 26 mm
* Weather data for San Luis United States 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 | 1.2 | -0.1 | 3.6 | 6 | 7.1 | 8.3 | 7.9 | 2.7 | -3.2 | 3.2 | 4.2 | 4.2 | 1.7 | 0.6 | 0.4 | 1.1 | 1.7 | 2 | 4.7 | 5.5 | 4.5 | 3.5 | 1.9 | -0.7 | -5.6 | -5.5 | -2.8 | -4.5 | -1.4 | -1.4 | 0.9 |
| Apparent max temperature | -5.3 | -7.3 | -2.4 | 1.7 | 3.2 | 5.1 | 1.5 | -2.4 | -8 | -0.8 | 0.2 | -0.2 | -2.5 | -2.3 | -2.9 | -3 | -2 | -1.5 | 0.6 | 2.1 | 1.6 | 0.2 | -1.9 | -4.7 | -9.5 | -9.3 | -6.6 | -8.4 | -5 | -5.6 | -2.8 |
| Mean temperature | -2.1 | -4.8 | -3.6 | -2.3 | -2 | -0.7 | 0.9 | -0.6 | -6.5 | -10.3 | -5.4 | -1.5 | -1.7 | -3.9 | -5.1 | -8.6 | -5.2 | -6.2 | -3.1 | -1.2 | -0.4 | -4 | -1.1 | -3.1 | -10.2 | -11.5 | -8.8 | -13.1 | -9.2 | -8 | -6.5 |
| Apparent mean temperature | -9.5 | -12.3 | -13.2 | -13.1 | -11.9 | -9.6 | -9.7 | -8.4 | -14.2 | -21.9 | -16.2 | -10.3 | -9.1 | -12.7 | -12.3 | -20.5 | -14.4 | -17.3 | -11.9 | -10.2 | -6.9 | -11.9 | -7.7 | -9.5 | -21.3 | -21.2 | -18.3 | -24.3 | -19.5 | -18.5 | -16.3 |
| Minimum temperature | -4.8 | -7.5 | -6.6 | -9 | -7.1 | -5.4 | -4.2 | -3.6 | -9.6 | -17 | -11.5 | -5.5 | -5.2 | -8.1 | -9 | -15.4 | -9.8 | -12.5 | -7.3 | -6 | -3.5 | -8.3 | -3.9 | -5.8 | -17.1 | -16.4 | -13.7 | -19.7 | -14.8 | -13.6 | -11.5 |
| Apparent min temperature | -7.7 | -10.2 | -10 | -6.6 | -5.8 | -4.5 | -4.5 | -6.2 | -11 | -14.8 | -9.7 | -5.7 | -5.7 | -7.7 | -8.8 | -13.1 | -9.5 | -10.3 | -7 | -4.8 | -3.6 | -7.5 | -5.2 | -6.9 | -14.5 | -16.1 | -13.2 | -17.3 | -13.4 | -12.4 | -10.7 |
| 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) | 9.8 | 9.8 | 9.8 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.7 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 | 9.6 |
| Sunshine duration (h) | 8.7 | 8.6 | 8.8 | 8.8 | 8.8 | 8.7 | 8.7 | 8.6 | 8.4 | 8.7 | 8.6 | 1.6 | 2.8 | 6.2 | 8.1 | 8.6 | 8.6 | 8.6 | 7.7 | 6.6 | 8 | 8.3 | 6.5 | 7 | 8.3 | 8.3 | 8.6 | 8.5 | 8.6 | 8.6 | 8 |
| Precipitation (mm) | 0.5 | 2.4 | 0 | 0 | 0 | 0 | 0 | 4.1 | 0.9 | 0 | 0 | 0 | 1.8 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 1.2 | 0 | 2.9 | 7.5 | 1.4 | 0 | 0 | 0 | 0 | 0 | 0.6 |
| Precipitation hours | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 8 | 5 | 0 | 0 | 0 | 6 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 8 | 8 | 5 | 0 | 0 | 0 | 0 | 0 | 2 |
| Wind speed (m/s) | 26.2 | 23.8 | 28.8 | 13.3 | 10.1 | 9.2 | 25.2 | 30.8 | 12.4 | 11.6 | 11.3 | 10 | 12.8 | 11.4 | 7.4 | 10.5 | 8.6 | 9 | 7.6 | 6.5 | 5.8 | 6.3 | 23.9 | 12.2 | 12.8 | 9.4 | 10.7 | 6.8 | 9.7 | 9.3 | 8.3 |
In December 2023, the highest daytime temperature in San Luis was 8.3°C.
While the minimum temperature at night dropped to -19.7°C.
The average nighttime and daytime temperatures during December in San Luis are -9.5°C and 1.7°C respectively.
The precipitation sum in December is about 26 mm.