December weather in Marathon, FL
The average temperature in Marathon in December is 72.7°F (67.5°F–77.9°F). Average precipitation: 2.20 inches.
December is a winter month in Marathon, and is cooler than the annual average of 78.8°F. Daily temperatures swing about 10.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 10h 28m. For travel, December is one of the best months of the year to visit.
Avg High
77.9°F
Avg Low
67.5°F
Precipitation
2.20 in
Daylight
10h 28m
December records in Marathon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 88.0°F (2016) | 57.9°F (2011) | 0.73 in (2010) |
| December 2 | 86.0°F (2015) | 57.9°F (2008) | 0.91 in (2015) |
| December 3 | 87.1°F (2023) | 57.0°F (2008) | 1.17 in (2015) |
| December 4 | 88.0°F (2018) | 59.0°F (2024) | 1.36 in (2015) |
| December 5 | 86.0°F (2016) | 62.1°F (2010) | 1.15 in (2003) |
| December 6 | 88.0°F (2016) | 53.1°F (2010) | 3.25 in (2015) |
| December 7 | 84.9°F (2016) | 50.0°F (2010) | 1.06 in (2001) |
| December 8 | 86.0°F (2017) | 48.9°F (2010) | 0.73 in (2025) |
| December 9 | 84.9°F (2005) | 53.1°F (2010) | 0.86 in (2017) |
| December 10 | 86.0°F (2004) | 52.0°F (2014) | 0.46 in (2000) |
| December 11 | 86.0°F (2012) | 48.9°F (2014) | 1.50 in (2013) |
| December 12 | 87.1°F (2016) | 54.0°F (2017) | 0.48 in (2013) |
| December 13 | 84.0°F (2002) | 55.9°F (2004) | 0.65 in (2025) |
| December 14 | 87.1°F (2018) | 44.1°F (2010) | 0.56 in (2003) |
| December 15 | 86.0°F (2013) | 45.0°F (2010) | 1.21 in (2006) |
| December 16 | 84.0°F (2009) | 48.9°F (2010) | 1.34 in (2023) |
| December 17 | 86.0°F (2016) | 55.9°F (2010) | 2.24 in (2006) |
| December 18 | 88.0°F (2016) | 52.0°F (2003) | 0.79 in (2009) |
| December 19 | 88.0°F (2016) | 54.0°F (2003) | 0.11 in (1998) |
| December 20 | 87.1°F (2018) | 51.1°F (2003) | 1.09 in (2022) |
| December 21 | 84.0°F (2022) | 52.0°F (2003) | 0.20 in (2021) |
| December 22 | 84.0°F (1999) | 54.0°F (2012) | 0.16 in (2000) |
| December 23 | 84.0°F (2006) | 57.9°F (2005) | 2.68 in (2019) |
| December 24 | 84.9°F (2016) | 53.1°F (2022) | 0.16 in (2003) |
| December 25 | 82.9°F (2011) | 51.1°F (2022) | 1.49 in (2023) |
| December 26 | 84.0°F (2015) | 50.0°F (2022) | 2.74 in (2023) |
| December 27 | 84.9°F (2007) | 48.0°F (2010) | 0.21 in (2011) |
| December 28 | 84.9°F (2007) | 44.1°F (2010) | 0.94 in (2023) |
| December 29 | 87.1°F (2018) | 51.1°F (2010) | 2.45 in (2024) |
| December 30 | 86.0°F (2007) | 55.9°F (2000) | 0.19 in (2019) |
| December 31 | 87.1°F (2007) | 50.0°F (2000) | 1.60 in (2001) |