December is one of the cooler months of the year in Fort Pierce, with average highs near 23.3°C and lows around 14.9°C (mean 19.1°C). It is one of the drier months, averaging 55 mm of rainfall and 80% relative humidity across the period.
December is one of the cooler months of the year in Fort Pierce. Across 45 years of records, the warmest December in Fort Pierce was 2015 — when the month averaged 23.3°C — while the coldest was 2010 at 13.7°C. Typical December days reach 23.3°C with nights near 14.9°C. The long-term trend is warming, about 0.5°C per decade.
December is one of the drier months in Fort Pierce, averaging 55 mm of rainfall. The wettest December on record was 2002 with 183 mm, while the driest was 1987 at 11 mm.
Relative humidity in Fort Pierce during December averages 80%. The most humid December was 1994 at 88%, and the least humid was 2010 at 64%.
December receives about 3.1 kWh/m²/day of solar energy in Fort Pierce. The sunniest December was 2010 at 3.6 kWh/m²/day, and the cloudiest were 1986, 2009 and 2023 at 2.7.
Average wind speed in Fort Pierce during December is 2.7 m/s. The windiest Decembers were 2019 and 2023 at 3.2 m/s, while the calmest was 2021 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.3°C | 18.7°C | 19.0°C | 19.9°C | 19.8°C | +1.5°C |
| Avg High | 22.5°C | 22.8°C | 23.1°C | 24.3°C | 24.1°C | +1.6°C |
| Avg Low | 14.0°C | 14.7°C | 14.8°C | 15.6°C | 15.4°C | +1.4°C |
| Avg Rain | 52 mm | 55 mm | 67 mm | 53 mm | 45 mm | -6 mm |
December temperatures in Fort Pierce have risen by about 2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -5.5°C (1989) to a record high of 30.4°C (2018).
Rainfall in December is one of the drier months, averaging 55 mm, with a wettest year of 183 mm.
One of the best times to visit Fort Pierce
December is one of the best times to visit Fort Pierce. Expect days averaging 23.3°C and nights around 14.9°C (mean 19.1°C) — cooler than Fort Pierce's yearly average — with moderate rainfall (55 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.7°C | 20.9°C | 16.1°C | 29.9°C | 4.5°C | 24 mm | 76% | 2.5 m/s | — |
| 2024 | 24.2°C | 19.8°C | 15.5°C | 28.2°C | 8.0°C | 63 mm | 80% | 2.9 m/s | 3.3 |
| 2023 | 23.2°C | 19.8°C | 16.3°C | 29.5°C | 8.3°C | 89 mm | 80% | 3.2 m/s | 2.7 |
| 2022 | 23.3°C | 19.4°C | 15.4°C | 27.4°C | 1.4°C | 39 mm | 81% | 2.5 m/s | 3.1 |
| 2021 | 26.3°C | 21.6°C | 17.0°C | 28.6°C | 9.7°C | 27 mm | 81% | 1.9 m/s | 3.5 |
| 2020 | 21.7°C | 17.0°C | 12.2°C | 26.4°C | 3.8°C | 30 mm | 82% | 2.6 m/s | 3.3 |
| 2019 | 24.7°C | 20.5°C | 16.4°C | 29.1°C | 7.1°C | 115 mm | 80% | 3.2 m/s | 2.9 |
| 2018 | 24.5°C | 19.9°C | 15.3°C | 30.4°C | 6.9°C | 49 mm | 78% | 3 m/s | 3.3 |
| 2017 | 23.5°C | 19.0°C | 14.5°C | 27.0°C | 4.1°C | 35 mm | 84% | 2.2 m/s | 3.5 |
| 2016 | 26.1°C | 22.2°C | 18.4°C | 29.3°C | 11.6°C | 30 mm | 81% | 2.7 m/s | 3.2 |
| 2015 🔥 | 26.5°C | 23.3°C | 20.2°C | 28.8°C | 14.3°C | 93 mm | 87% | 3 m/s | 2.9 |
| 2014 | 23.9°C | 19.4°C | 14.9°C | 28.2°C | 5.9°C | 42 mm | 80% | 2.3 m/s | 3.2 |
| 2013 | 25.7°C | 21.7°C | 17.6°C | 28.8°C | 11.2°C | 30 mm | 79% | 2.7 m/s | 3 |
| 2012 | 23.8°C | 19.5°C | 15.2°C | 27.5°C | 4.6°C | 67 mm | 81% | 2.5 m/s | 3.3 |
| 2011 | 24.0°C | 20.2°C | 16.4°C | 26.9°C | 8.6°C | 52 mm | 80% | 2.7 m/s | 3.2 |
| 2010 ❄️ | 19.9°C | 13.7°C | 7.5°C | 25.1°C | -1.0°C | 20 mm | 64% | 3.1 m/s | 3.6 |
| 2009 | 23.7°C | 19.6°C | 15.5°C | 28.9°C | 4.6°C | 118 mm | 82% | 3 m/s | 2.7 |
| 2008 | 22.9°C | 18.9°C | 14.8°C | 26.1°C | 6.2°C | 28 mm | 82% | 2.5 m/s | 3.3 |
| 2007 | 25.2°C | 21.1°C | 17.0°C | 27.9°C | 6.4°C | 52 mm | 83% | 2.2 m/s | 3.2 |
| 2006 | 25.5°C | 21.9°C | 18.3°C | 29.4°C | 7.4°C | 59 mm | 77% | 3.1 m/s | 2.8 |
| 2005 | 21.8°C | 17.4°C | 13.0°C | 26.5°C | 6.7°C | 33 mm | 82% | 2.8 m/s | 3.2 |
| 2004 | 22.2°C | 18.1°C | 13.9°C | 27.6°C | 5.4°C | 61 mm | 79% | 2.9 m/s | 3.1 |
| 2003 | 21.7°C | 17.1°C | 12.4°C | 26.0°C | 4.6°C | 69 mm | 78% | 2.9 m/s | 3.2 |
| 2002 🌧️ | 21.8°C | 17.2°C | 12.6°C | 27.3°C | 4.1°C | 183 mm | 83% | 2.8 m/s | 3 |
| 2001 | 23.7°C | 20.2°C | 16.7°C | 27.1°C | 5.1°C | 38 mm | 84% | 2.5 m/s | 3.2 |
| 2000 | 22.9°C | 18.4°C | 13.8°C | 28.4°C | -0.2°C | 25 mm | 73% | 3.1 m/s | 3.2 |
| 1999 | 22.1°C | 18.1°C | 14.1°C | 26.2°C | 6.1°C | 42 mm | 83% | 2.5 m/s | 3.1 |
| 1998 | 24.5°C | 20.7°C | 16.9°C | 27.0°C | 7.2°C | 32 mm | 83% | 2.3 m/s | 3.3 |
| 1997 | 21.6°C | 17.4°C | 13.2°C | 27.5°C | 4.2°C | 146 mm | 86% | 2.9 m/s | 2.9 |
| 1996 | 23.8°C | 19.3°C | 14.9°C | 27.2°C | 4.0°C | 53 mm | 78% | 2.6 m/s | 3.1 |
| 1995 | 20.8°C | 16.7°C | 12.7°C | 25.4°C | 0.4°C | 26 mm | 84% | 2.6 m/s | 3.1 |
| 1994 | 22.9°C | 19.4°C | 15.9°C | 27.2°C | 6.9°C | 130 mm | 88% | 2.7 m/s | 2.9 |
| 1993 | 21.5°C | 16.8°C | 12.0°C | 25.8°C | 4.3°C | 36 mm | 79% | 2.7 m/s | 3.2 |
| 1992 | 23.0°C | 19.1°C | 15.3°C | 25.8°C | 5.8°C | 43 mm | 85% | 2.4 m/s | 3.1 |
| 1991 | 23.4°C | 19.7°C | 15.9°C | 27.6°C | 9.2°C | 25 mm | 82% | 2.5 m/s | 3.1 |
| 1990 | 24.3°C | 20.2°C | 16.1°C | 27.3°C | 7.3°C | 14 mm | 79% | 2.5 m/s | 3.1 |
| 1989 | 20.3°C | 15.2°C | 10.2°C | 26.5°C | -5.5°C | 78 mm | 78% | 2.7 m/s | 3 |
| 1988 | 23.8°C | 19.0°C | 14.2°C | 27.8°C | 2.3°C | 33 mm | 76% | 2.4 m/s | 3.2 |
| 1987 | 22.5°C | 18.2°C | 13.9°C | 26.3°C | 3.8°C | 11 mm | 81% | 2.7 m/s | 2.9 |
| 1986 | 24.0°C | 20.6°C | 17.1°C | 28.2°C | 11.0°C | 107 mm | 83% | 2.8 m/s | 2.7 |
| 1985 | 20.7°C | 16.2°C | 11.7°C | 26.5°C | -1.9°C | 51 mm | 78% | 2.7 m/s | 2.9 |
| 1984 | 23.7°C | 20.0°C | 16.2°C | 26.2°C | 5.1°C | 23 mm | 80% | 2.3 m/s | 3 |
| 1983 | 21.9°C | 18.0°C | 14.1°C | 27.2°C | -2.2°C | 107 mm | 86% | 2.9 m/s | — |
| 1982 | 23.1°C | 19.7°C | 16.2°C | 26.9°C | 5.4°C | 39 mm | 83% | 3 m/s | — |
| 1981 | 22.5°C | 17.4°C | 12.3°C | 28.6°C | 0.9°C | 18 mm | 73% | 2.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 23.3°C with lows near 14.9°C (mean 19.1°C), based on 45 years of NASA POWER data.
December averages 55 mm of rainfall in Fort Pierce, one of the drier months. The wettest on record was 183 mm in 2002.
The hottest December reached 30.4°C in 2018. The coldest dipped to -5.5°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2°C. Daytime highs moved from 22.4°C to 24.5°C and overnight lows from 14.1°C to 16.1°C over the same span.
December is one of the cooler months of the year in Fort Pierce and one of the drier months, so plan for around 23.3°C daytime highs and 14.9°C at night.
Not quite — December is the 2nd coolest month in Fort Pierce, averaging 19.1°C.
For December in Fort Pierce, pack light layers you can adjust through the day, with typical highs of 23.3°C and lows of 14.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 80% — quite humid.
Average wind speed in December is 2.7 m/s. The windiest December on record averaged 3.2 m/s (2019).
The wettest December on record was 2002 with 183 mm. On average, December sees 55 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Fort Pierce behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
