December weather in Key Biscayne, FL
The average temperature in Key Biscayne in December is 72.9°F (66.0°F–79.7°F). Average precipitation: 2.24 inches.
December is a winter month in Key Biscayne, and is cooler than the annual average of 78.7°F. Daily temperatures swing about 13.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 10h 24m. For travel, December is one of the best months of the year to visit.
Avg High
79.7°F
Avg Low
66.0°F
Precipitation
2.24 in
Daylight
10h 24m
December records in Key Biscayne
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 87.1°F (2022) | 55.0°F (2011) | 0.43 in (2008) |
| December 2 | 84.9°F (2015) | 51.1°F (2005) | 0.34 in (2022) |
| December 3 | 87.1°F (2018) | 51.1°F (2019) | 0.30 in (2015) |
| December 4 | 88.0°F (2018) | 52.0°F (2019) | 4.74 in (2015) |
| December 5 | 88.0°F (2018) | 54.0°F (2019) | 4.56 in (1997) |
| December 6 | 84.0°F (2021) | 52.0°F (2010) | 0.61 in (2015) |
| December 7 | 84.9°F (2017) | 44.1°F (2010) | 0.71 in (2002) |
| December 8 | 84.9°F (2017) | 41.0°F (2010) | 2.88 in (2015) |
| December 9 | 86.0°F (2017) | 46.0°F (2010) | 1.57 in (2015) |
| December 10 | 84.0°F (2012) | 43.0°F (2020) | 1.58 in (2002) |
| December 11 | 84.0°F (2009) | 44.1°F (2014) | 2.27 in (2000) |
| December 12 | 86.0°F (2019) | 44.1°F (2017) | 0.18 in (2020) |
| December 13 | 84.9°F (2021) | 46.0°F (2004) | 0.38 in (2011) |
| December 14 | 84.9°F (2021) | 37.0°F (2010) | 0.93 in (1997) |
| December 15 | 84.9°F (2015) | 37.9°F (2010) | 0.64 in (2024) |
| December 16 | 86.0°F (2022) | 44.1°F (2010) | 0.43 in (2025) |
| December 17 | 84.0°F (2015) | 53.1°F (2007) | 0.95 in (2023) |
| December 18 | 86.0°F (2019) | 46.0°F (2003) | 2.27 in (2009) |
| December 19 | 86.0°F (2012) | 46.9°F (2003) | 1.71 in (2009) |
| December 20 | 84.9°F (2016) | 43.0°F (2003) | 0.75 in (2019) |
| December 21 | 84.0°F (2018) | 48.0°F (2003) | 0.74 in (2018) |
| December 22 | 82.9°F (2013) | 48.0°F (2012) | 0.84 in (1999) |
| December 23 | 84.9°F (2022) | 46.0°F (2012) | 2.23 in (2019) |
| December 24 | 84.9°F (2013) | 48.0°F (2022) | 0.21 in (2006) |
| December 25 | 84.9°F (2013) | 46.9°F (2022) | 1.55 in (2014) |
| December 26 | 84.9°F (2015) | 43.0°F (2022) | 0.75 in (2013) |
| December 27 | 84.0°F (2015) | 41.0°F (2010) | 0.84 in (2013) |
| December 28 | 82.9°F (2014) | 39.9°F (2010) | 0.21 in (2013) |
| December 29 | 84.0°F (2015) | 44.1°F (2010) | 0.63 in (2023) |
| December 30 | 84.9°F (2018) | 50.0°F (2000) | 0.31 in (2024) |
| December 31 | 86.0°F (2021) | 44.1°F (2000) | 0.11 in (2019) |