December is one of the cooler months of the year in Deltona, with average highs near 22°C and lows around 11.4°C (mean 16.7°C). It is one of the drier months, averaging 64 mm of rainfall and 80% relative humidity across the period.
December is one of the cooler months of the year in Deltona. Across 45 years of records, the warmest December in Deltona was 2015 — when the month averaged 22°C — while the coldest was 2010 at 10.9°C. Typical December days reach 22°C with nights near 11.4°C. The long-term trend is warming, about 0.4°C per decade.
December is one of the drier months in Deltona, averaging 64 mm of rainfall. The wettest December on record was 1997 with 257 mm, while the driest was 1984 at 7 mm.
Relative humidity in Deltona during December averages 80%. The most humid December was 1994 at 90%, and the least humid was 2010 at 61%.
December receives about 3.1 kWh/m²/day of solar energy in Deltona. The sunniest December was 2010 at 3.7 kWh/m²/day, and the cloudiest were 1986, 1997 and 2009 at 2.6.
Average wind speed in Deltona during December is 1.9 m/s. The windiest Decembers were 1983, 2010 and 2019 at 2.3 m/s, while the calmest were 1984 and 2021 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.7°C | 16.7°C | 16.3°C | 17.7°C | 17.1°C | +1.4°C |
| Avg High | 20.8°C | 21.9°C | 21.5°C | 23.2°C | 22.6°C | +1.8°C |
| Avg Low | 10.6°C | 11.5°C | 11.1°C | 12.2°C | 11.7°C | +1.1°C |
| Avg Rain | 73 mm | 66 mm | 72 mm | 51 mm | 53 mm | -20 mm |
December temperatures in Deltona have risen by about 1.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -7.5°C (1989) to a record high of 30.1°C (2015).
Rainfall in December is one of the drier months, averaging 64 mm, with a wettest year of 257 mm.
A good time to visit Deltona
December is a good time to visit Deltona, with days averaging 22°C and nights around 11.4°C (mean 16.7°C, cooler than Deltona's yearly average) and moderate rainfall. April and October are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.8°C | 17.9°C | 12.0°C | 28.2°C | 0.8°C | 48 mm | 79% | 1.8 m/s | — |
| 2024 | 22.7°C | 17.2°C | 11.6°C | 27.4°C | 3.3°C | 45 mm | 81% | 1.9 m/s | 3.2 |
| 2023 | 21.3°C | 17.0°C | 12.7°C | 27.3°C | 4.0°C | 105 mm | 84% | 2.1 m/s | 2.9 |
| 2022 | 21.8°C | 16.5°C | 11.2°C | 26.9°C | -3.5°C | 30 mm | 80% | 1.7 m/s | 3 |
| 2021 | 25.4°C | 19.7°C | 14.1°C | 28.4°C | 5.2°C | 66 mm | 84% | 1.5 m/s | 3.4 |
| 2020 | 20.3°C | 14.4°C | 8.6°C | 26.9°C | -1.0°C | 21 mm | 79% | 1.9 m/s | 3.3 |
| 2019 | 23.3°C | 18.4°C | 13.5°C | 28.2°C | 2.7°C | 111 mm | 82% | 2.3 m/s | 3 |
| 2018 | 21.9°C | 16.7°C | 11.6°C | 29.6°C | 3.1°C | 127 mm | 83% | 2 m/s | 3 |
| 2017 | 22.1°C | 16.6°C | 11.1°C | 26.7°C | 0.7°C | 22 mm | 85% | 1.6 m/s | 3.3 |
| 2016 | 25.7°C | 19.9°C | 14.1°C | 29.9°C | 6.0°C | 24 mm | 76% | 1.9 m/s | 3.3 |
| 2015 🔥 | 26.6°C | 22.0°C | 17.4°C | 30.1°C | 8.2°C | 20 mm | 83% | 2 m/s | 2.9 |
| 2014 | 21.5°C | 16.6°C | 11.7°C | 26.6°C | 2.8°C | 61 mm | 85% | 1.6 m/s | 3 |
| 2013 | 25.0°C | 19.3°C | 13.6°C | 29.6°C | 5.4°C | 35 mm | 79% | 1.9 m/s | 3.2 |
| 2012 | 23.6°C | 17.7°C | 11.7°C | 28.6°C | 0.2°C | 55 mm | 78% | 1.9 m/s | 3.1 |
| 2011 | 24.2°C | 18.9°C | 13.7°C | 28.8°C | 5.2°C | 41 mm | 76% | 2 m/s | 3.3 |
| 2010 ❄️ | 18.0°C | 10.9°C | 3.7°C | 25.4°C | -4.4°C | 12 mm | 61% | 2.3 m/s | 3.7 |
| 2009 | 20.9°C | 16.3°C | 11.6°C | 27.8°C | 0.3°C | 114 mm | 84% | 2.1 m/s | 2.6 |
| 2008 | 22.4°C | 17.2°C | 12.0°C | 26.5°C | 2.5°C | 25 mm | 81% | 1.8 m/s | 3.4 |
| 2007 | 24.1°C | 18.8°C | 13.5°C | 27.8°C | 1.9°C | 42 mm | 83% | 1.7 m/s | 3.3 |
| 2006 | 23.8°C | 19.5°C | 15.1°C | 29.8°C | 3.9°C | 92 mm | 80% | 2.1 m/s | 2.7 |
| 2005 | 19.2°C | 14.0°C | 8.8°C | 23.7°C | 2.7°C | 62 mm | 82% | 2.1 m/s | 3.1 |
| 2004 | 19.7°C | 14.7°C | 9.8°C | 26.9°C | 0.3°C | 55 mm | 83% | 2 m/s | 2.9 |
| 2003 | 20.8°C | 14.8°C | 8.9°C | 26.0°C | 1.4°C | 46 mm | 76% | 2 m/s | 3.4 |
| 2002 | 19.7°C | 14.0°C | 8.4°C | 26.6°C | 1.1°C | 241 mm | 83% | 2 m/s | 3.1 |
| 2001 | 22.8°C | 18.2°C | 13.6°C | 27.3°C | 1.5°C | 17 mm | 83% | 1.7 m/s | 3.2 |
| 2000 | 21.3°C | 15.3°C | 9.3°C | 29.1°C | -4.5°C | 23 mm | 71% | 2.1 m/s | 3.2 |
| 1999 | 20.9°C | 15.6°C | 10.3°C | 26.9°C | 1.1°C | 46 mm | 79% | 1.8 m/s | 3.1 |
| 1998 | 25.2°C | 19.8°C | 14.3°C | 29.3°C | 3.7°C | 26 mm | 78% | 1.8 m/s | 3.1 |
| 1997 🌧️ | 19.7°C | 15.0°C | 10.3°C | 26.4°C | -0.3°C | 257 mm | 87% | 2.1 m/s | 2.6 |
| 1996 | 22.3°C | 16.7°C | 11.1°C | 26.9°C | -0.8°C | 56 mm | 78% | 1.9 m/s | 3.1 |
| 1995 | 20.0°C | 14.8°C | 9.5°C | 26.5°C | -3.1°C | 88 mm | 79% | 1.9 m/s | 3.1 |
| 1994 | 21.4°C | 17.1°C | 12.8°C | 27.0°C | 4.0°C | 88 mm | 90% | 1.9 m/s | 2.7 |
| 1993 | 20.2°C | 14.5°C | 8.8°C | 26.9°C | 0.5°C | 38 mm | 73% | 2.1 m/s | 3.3 |
| 1992 | 21.7°C | 16.9°C | 12.1°C | 25.9°C | 3.0°C | 18 mm | 86% | 1.9 m/s | 2.8 |
| 1991 | 22.8°C | 17.7°C | 12.6°C | 28.5°C | 5.2°C | 23 mm | 78% | 1.9 m/s | 3.1 |
| 1990 | 24.7°C | 19.0°C | 13.2°C | 29.9°C | 4.8°C | 24 mm | 74% | 1.8 m/s | 3.1 |
| 1989 | 17.1°C | 11.4°C | 5.8°C | 24.8°C | -7.5°C | 121 mm | 79% | 1.9 m/s | 3 |
| 1988 | 20.6°C | 15.2°C | 9.9°C | 26.2°C | -1.7°C | 28 mm | 82% | 1.7 m/s | 3.2 |
| 1987 | 21.7°C | 16.5°C | 11.3°C | 26.0°C | 0.2°C | 18 mm | 80% | 1.9 m/s | 2.9 |
| 1986 | 22.5°C | 18.2°C | 13.9°C | 28.1°C | 7.9°C | 80 mm | 82% | 2.1 m/s | 2.6 |
| 1985 | 18.6°C | 13.1°C | 7.6°C | 25.7°C | -6.1°C | 51 mm | 78% | 1.9 m/s | 3.2 |
| 1984 | 24.5°C | 18.9°C | 13.4°C | 27.5°C | 0.3°C | 7 mm | 76% | 1.5 m/s | 2.9 |
| 1983 | 19.7°C | 15.2°C | 10.6°C | 27.5°C | -7.1°C | 192 mm | 85% | 2.3 m/s | — |
| 1982 | 22.5°C | 18.3°C | 14.1°C | 27.1°C | 2.8°C | 45 mm | 83% | 2.2 m/s | — |
| 1981 | 20.2°C | 14.6°C | 9.0°C | 27.8°C | -3.3°C | 113 mm | 75% | 2.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 22°C with lows near 11.4°C (mean 16.7°C), based on 45 years of NASA POWER data.
December averages 64 mm of rainfall in Deltona, one of the drier months. The wettest on record was 257 mm in 1997.
The hottest December reached 30.1°C in 2015. The coldest dipped to -7.5°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.7°C. Daytime highs moved from 21.1°C to 23°C and overnight lows from 10.9°C to 12.3°C over the same span.
December is one of the cooler months of the year in Deltona and one of the drier months, so plan for around 22°C daytime highs and 11.4°C at night.
Not quite — December is the 2nd coolest month in Deltona, averaging 16.7°C.
For December in Deltona, pack light layers you can adjust through the day, with typical highs of 22°C and lows of 11.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 80% — quite humid.
Average wind speed in December is 1.9 m/s. The windiest December on record averaged 2.3 m/s (1983).
The wettest December on record was 1997 with 257 mm. On average, December sees 64 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 Deltona 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.
