December weather in Castle Valley, UT
The average temperature in Castle Valley in December is 29.2°F (19.4°F–39.0°F). Average precipitation: 1.01 inches.
December is a winter month in Castle Valley, and is cooler than the annual average of 54.7°F. Daily temperatures swing about 19.6°F between overnight low and afternoon high. Daylight averages about 9h 19m. For travel, December is cold.
Avg High
39.0°F
Avg Low
19.4°F
Precipitation
1.01 in
Daylight
9h 19m
December records in Castle Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 55.0°F (2021) | 12.9°F (2015) | 0.18 in (2018) |
| December 2 | 57.0°F (2017) | 15.1°F (2015) | 0.04 in (2023) |
| December 3 | 55.0°F (2021) | 16.0°F (2020) | 0.19 in (2018) |
| December 4 | 61.0°F (2017) | 10.9°F (2018) | 0.00 in (2015) |
| December 5 | 55.0°F (2021) | 16.0°F (2018) | 0.15 in (2019) |
| December 6 | 55.9°F (2021) | 16.0°F (2016) | 0.17 in (2022) |
| December 7 | 50.0°F (2021) | 15.1°F (2017) | 0.12 in (2021) |
| December 8 | 57.9°F (2023) | 12.9°F (2016) | 0.52 in (2022) |
| December 9 | 52.0°F (2019) | 17.1°F (2017) | 0.15 in (2019) |
| December 10 | 48.0°F (2021) | 16.0°F (2017) | 1.03 in (2024) |
| December 11 | 54.0°F (2015) | 16.0°F (2024) | 0.02 in (2016) |
| December 12 | 55.0°F (2022) | 16.0°F (2021) | 0.09 in (2015) |
| December 13 | 55.0°F (2016) | 8.1°F (2020) | 0.25 in (2022) |
| December 14 | 51.1°F (2019) | 14.0°F (2020) | 0.12 in (2017) |
| December 15 | 50.0°F (2019) | 15.1°F (2020) | 0.24 in (2021) |
| December 16 | 55.9°F (2016) | 10.0°F (2022) | 0.13 in (2016) |
| December 17 | 55.9°F (2016) | 6.1°F (2022) | 0.26 in (2016) |
| December 18 | 46.0°F (2023) | 8.1°F (2022) | 0.02 in (2016) |
| December 19 | 46.0°F (2024) | 9.0°F (2022) | 0.00 in (2015) |
| December 20 | 50.0°F (2018) | 12.9°F (2016) | 0.00 in (2015) |
| December 21 | 45.0°F (2018) | 14.0°F (2022) | 0.35 in (2017) |
| December 22 | 46.0°F (2023) | 8.1°F (2017) | 0.28 in (2017) |
| December 23 | 52.0°F (2020) | 10.0°F (2017) | 0.42 in (2016) |
| December 24 | 52.0°F (2020) | 10.0°F (2017) | 0.11 in (2023) |
| December 25 | 48.9°F (2021) | 10.0°F (2017) | 0.58 in (2021) |
| December 26 | 50.0°F (2021) | 10.9°F (2015) | 0.23 in (2018) |
| December 27 | 43.0°F (2021) | 6.1°F (2015) | 0.04 in (2019) |
| December 28 | 44.1°F (2022) | 1.9°F (2015) | 0.97 in (2022) |
| December 29 | 42.1°F (2022) | 5.0°F (2019) | 0.57 in (2022) |
| December 30 | 55.0°F (2024) | 7.0°F (2020) | 0.01 in (2020) |
| December 31 | 48.0°F (2024) | 5.0°F (2019) | 0.73 in (2015) |