December weather in Royal, IA
The average temperature in Royal in December is 22.2°F (13.6°F–30.7°F). Average precipitation: 0.42 inches.
December is a winter month in Royal, and is cooler than the annual average of 46.8°F. Daily temperatures swing about 17.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 50m. For travel, December is cold.
Avg High
30.7°F
Avg Low
13.6°F
Precipitation
0.42 in
Daylight
8h 50m
December records in Royal
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (1998) | -7.1°F (2025) | 0.38 in (2007) |
| December 2 | 63.0°F (1998) | -5.1°F (2000) | 0.09 in (2000) |
| December 3 | 63.0°F (1998) | -11.9°F (2025) | 0.25 in (2011) |
| December 4 | 55.9°F (2017) | -18.9°F (2025) | 0.04 in (2007) |
| December 5 | 61.0°F (2001) | -13.0°F (2005) | 0.02 in (2001) |
| December 6 | 53.1°F (2023) | -17.0°F (2005) | 0.20 in (2025) |
| December 7 | 60.1°F (2023) | -17.0°F (2005) | 0.08 in (2001) |
| December 8 | 63.0°F (2024) | -13.0°F (2005) | 0.31 in (2022) |
| December 9 | 57.9°F (2020) | -11.0°F (2005) | 0.42 in (2022) |
| December 10 | 51.1°F (2020) | -9.8°F (2009) | 0.09 in (2021) |
| December 11 | 51.1°F (1998) | -18.8°F (2013) | 0.93 in (2010) |
| December 12 | 52.0°F (1998) | -17.0°F (2000) | 0.05 in (2015) |
| December 13 | 54.0°F (2014) | -8.9°F (2016) | 0.73 in (2022) |
| December 14 | 57.0°F (2023) | -17.0°F (2000) | 1.02 in (2015) |
| December 15 | 64.0°F (2021) | -12.8°F (2009) | 0.53 in (2014) |
| December 16 | 51.1°F (2006) | -8.9°F (2008) | 0.48 in (2023) |
| December 17 | 46.9°F (2001) | -17.9°F (2016) | 0.05 in (2002) |
| December 18 | 53.1°F (2011) | -26.9°F (2016) | 0.02 in (2008) |
| December 19 | 44.1°F (2006) | -14.1°F (1996) | 0.07 in (2012) |
| December 20 | 46.9°F (2020) | -16.1°F (1996) | 0.10 in (2006) |
| December 21 | 46.0°F (2020) | -16.1°F (1999) | 0.31 in (2006) |
| December 22 | 55.9°F (2020) | -20.9°F (1999) | 0.17 in (2014) |
| December 23 | 50.0°F (2023) | -15.9°F (2013) | 0.21 in (2015) |
| December 24 | 55.9°F (2023) | -18.9°F (2000) | 0.17 in (2023) |
| December 25 | 52.0°F (2023) | -18.9°F (2000) | 0.78 in (2016) |
| December 26 | 48.9°F (2011) | -18.9°F (1996) | 0.20 in (2018) |
| December 27 | 51.1°F (2003) | -12.8°F (2017) | 0.39 in (2018) |
| December 28 | 57.9°F (2002) | -9.8°F (2009) | 0.51 in (2019) |
| December 29 | 52.0°F (1999) | -17.9°F (2009) | 0.36 in (2019) |
| December 30 | 60.1°F (2004) | -11.9°F (1998) | 0.25 in (2024) |
| December 31 | 46.9°F (1999) | -21.8°F (2017) | 0.38 in (2006) |