December is one of the cooler months of the year in Smyrna, with average highs near 9.4°C and lows around -0.4°C (mean 4.5°C). It is a relatively wet time of year, averaging 129 mm of rainfall and 84% relative humidity across the period.
December is one of the cooler months of the year in Smyrna. Across 45 years of records, the warmest December in Smyrna was 2015 — when the month averaged 10.6°C — while the coldest was 1989 at -2.3°C. Typical December days reach 9.4°C with nights near -0.4°C. The long-term trend is warming, about 0.7°C per decade.
December is a relatively wet time of year in Smyrna, averaging 129 mm of rainfall. The wettest December on record was 1990 with 358 mm, while the driest was 1985 at 41 mm.
Relative humidity in Smyrna during December averages 84%. The most humid December was 1984 at 90%, and the least humid was 2023 at 74%.
December receives about 2 kWh/m²/day of solar energy in Smyrna. The sunniest Decembers were 1988, 2001 and 2004, among others at 2.4 kWh/m²/day, and the cloudiest were 1992 and 2014 at 1.6.
Average wind speed in Smyrna during December is 1.9 m/s. The windiest Decembers were 1982 and 2008 at 2.3 m/s, while the calmest was 1986 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.9°C | 4.7°C | 3.8°C | 5.3°C | 6.2°C | +3.3°C |
| Avg High | 7.7°C | 9.6°C | 8.8°C | 10.0°C | 11.4°C | +3.7°C |
| Avg Low | -1.8°C | -0.3°C | -1.2°C | 0.7°C | 0.9°C | +2.7°C |
| Avg Rain | 119 mm | 147 mm | 117 mm | 142 mm | 115 mm | -4 mm |
December temperatures in Smyrna have risen by about 3.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -20.9°C (1989) to a record high of 24.4°C (1998).
Rainfall in December is a relatively wet time of year, averaging 129 mm, with a wettest year of 358 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.8°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit Smyrna
If your dates are flexible, the more temperate months of September and June tend to be the most comfortable for visiting Smyrna. That said, December — with days averaging 9.4°C and nights around -0.4°C (mean 4.5°C) and higher rainfall (129 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 10.1°C | 5.1°C | 0.0°C | 22.1°C | -9.3°C | 68 mm | 79% | 1.8 m/s | — |
| 2024 | 11.1°C | 6.1°C | 1.0°C | 17.3°C | -7.0°C | 129 mm | 78% | 2 m/s | 2.1 |
| 2023 | 12.8°C | 7.0°C | 1.2°C | 21.1°C | -6.3°C | 83 mm | 74% | 1.7 m/s | 2.3 |
| 2022 | 9.5°C | 4.5°C | -0.5°C | 20.8°C | -15.8°C | 154 mm | 84% | 1.8 m/s | 2 |
| 2021 | 15.8°C | 10.3°C | 4.8°C | 21.1°C | -4.2°C | 133 mm | 85% | 2 m/s | 2 |
| 2020 | 9.2°C | 3.9°C | -1.4°C | 17.9°C | -8.1°C | 122 mm | 83% | 1.8 m/s | 2.2 |
| 2019 | 12.2°C | 7.4°C | 2.7°C | 20.1°C | -5.4°C | 148 mm | 86% | 1.8 m/s | 2.1 |
| 2018 | 9.7°C | 5.4°C | 1.0°C | 19.5°C | -6.5°C | 183 mm | 88% | 1.8 m/s | 1.8 |
| 2017 | 8.5°C | 3.6°C | -1.3°C | 17.9°C | -11.3°C | 119 mm | 79% | 1.8 m/s | 2.1 |
| 2016 | 9.5°C | 4.3°C | -1.0°C | 21.8°C | -15.3°C | 192 mm | 81% | 2 m/s | 2 |
| 2015 🔥 | 15.3°C | 10.6°C | 5.9°C | 23.2°C | -3.8°C | 167 mm | 87% | 1.9 m/s | 1.9 |
| 2014 | 9.3°C | 5.2°C | 1.2°C | 18.4°C | -4.1°C | 118 mm | 87% | 1.6 m/s | 1.6 |
| 2013 | 8.8°C | 4.1°C | -0.7°C | 21.1°C | -8.1°C | 157 mm | 84% | 1.8 m/s | 1.9 |
| 2012 | 12.4°C | 7.3°C | 2.3°C | 21.6°C | -6.4°C | 152 mm | 83% | 2 m/s | 1.9 |
| 2011 | 10.6°C | 5.6°C | 0.6°C | 18.6°C | -5.4°C | 138 mm | 85% | 1.6 m/s | 2 |
| 2010 | 4.0°C | -0.1°C | -4.2°C | 16.0°C | -13.6°C | 46 mm | 81% | 1.9 m/s | 2 |
| 2009 | 7.6°C | 3.0°C | -1.7°C | 17.8°C | -6.2°C | 126 mm | 86% | 2 m/s | 1.9 |
| 2008 | 9.1°C | 3.6°C | -1.8°C | 20.1°C | -10.8°C | 186 mm | 82% | 2.3 m/s | 2 |
| 2007 | 12.0°C | 7.1°C | 2.2°C | 22.8°C | -5.2°C | 94 mm | 83% | 1.8 m/s | 2 |
| 2006 | 12.1°C | 6.3°C | 0.5°C | 19.4°C | -8.0°C | 78 mm | 82% | 1.8 m/s | 2.3 |
| 2005 | 7.3°C | 2.2°C | -3.0°C | 16.0°C | -6.9°C | 72 mm | 81% | 1.8 m/s | 2.1 |
| 2004 | 8.3°C | 3.6°C | -1.1°C | 18.6°C | -11.5°C | 154 mm | 85% | 2 m/s | 2.4 |
| 2003 | 8.4°C | 3.2°C | -2.0°C | 14.1°C | -6.2°C | 87 mm | 81% | 1.9 m/s | 2.1 |
| 2002 | 7.6°C | 3.3°C | -1.0°C | 16.4°C | -12.9°C | 158 mm | 89% | 1.9 m/s | 2 |
| 2001 | 11.6°C | 6.6°C | 1.6°C | 20.7°C | -8.8°C | 107 mm | 82% | 1.9 m/s | 2.4 |
| 2000 | 4.4°C | -0.7°C | -5.8°C | 18.4°C | -12.6°C | 104 mm | 81% | 1.9 m/s | 2 |
| 1999 | 11.3°C | 5.6°C | -0.2°C | 20.1°C | -6.8°C | 72 mm | 75% | 1.9 m/s | 2.3 |
| 1998 | 10.9°C | 5.9°C | 0.9°C | 24.4°C | -10.0°C | 173 mm | 83% | 1.8 m/s | 1.9 |
| 1997 | 7.8°C | 3.3°C | -1.2°C | 15.6°C | -7.2°C | 70 mm | 86% | 1.6 m/s | 1.9 |
| 1996 | 10.5°C | 5.4°C | 0.3°C | 19.4°C | -10.3°C | 126 mm | 85% | 2.1 m/s | 2 |
| 1995 | 7.0°C | 2.3°C | -2.4°C | 19.1°C | -12.5°C | 72 mm | 83% | 1.9 m/s | 2 |
| 1994 | 11.5°C | 6.4°C | 1.3°C | 18.5°C | -4.9°C | 74 mm | 86% | 1.6 m/s | 1.8 |
| 1993 | 7.9°C | 3.5°C | -0.9°C | 16.2°C | -10.5°C | 186 mm | 85% | 1.8 m/s | 2 |
| 1992 | 8.2°C | 3.6°C | -1.0°C | 15.1°C | -7.3°C | 107 mm | 87% | 1.9 m/s | 1.6 |
| 1991 | 10.1°C | 5.3°C | 0.5°C | 21.9°C | -6.6°C | 236 mm | 86% | 1.8 m/s | 2.1 |
| 1990 🌧️ | 10.9°C | 5.4°C | -0.1°C | 19.8°C | -10.4°C | 358 mm | 86% | 2.1 m/s | 1.8 |
| 1989 ❄️ | 2.3°C | -2.3°C | -7.0°C | 15.8°C | -20.9°C | 68 mm | 84% | 2 m/s | 2.3 |
| 1988 | 8.9°C | 3.7°C | -1.5°C | 18.1°C | -6.4°C | 139 mm | 81% | 2 m/s | 2.4 |
| 1987 | 10.6°C | 5.3°C | 0.0°C | 17.8°C | -6.0°C | 158 mm | 81% | 2.1 m/s | 1.9 |
| 1986 | 7.4°C | 3.1°C | -1.2°C | 17.0°C | -5.2°C | 117 mm | 88% | 1.5 m/s | 1.9 |
| 1985 | 5.2°C | 0.2°C | -4.8°C | 18.3°C | -13.7°C | 41 mm | 80% | 2 m/s | 2.4 |
| 1984 | 12.6°C | 8.1°C | 3.7°C | 20.8°C | -10.6°C | 85 mm | 90% | 1.9 m/s | 1.9 |
| 1983 | 4.3°C | -0.2°C | -4.6°C | 19.0°C | -20.1°C | 198 mm | 86% | 2.1 m/s | — |
| 1982 | 11.5°C | 7.1°C | 2.7°C | 22.1°C | -7.2°C | 183 mm | 86% | 2.3 m/s | — |
| 1981 | 6.1°C | 1.3°C | -3.5°C | 15.3°C | -12.2°C | 83 mm | 82% | 1.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 9.4°C with lows near -0.4°C (mean 4.5°C), based on 45 years of NASA POWER data.
December averages 129 mm of rainfall in Smyrna, a relatively wet time of year. The wettest on record was 358 mm in 1990.
The hottest December reached 24.4°C in 1998. The coldest dipped to -20.9°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.3°C. Daytime highs moved from 7.9°C to 11.9°C and overnight lows from -1.3°C to 1.3°C over the same span.
December is one of the cooler months of the year in Smyrna and a relatively wet time of year, so plan for around 9.4°C daytime highs and -0.4°C at night.
Not quite — December is the 2nd coolest month in Smyrna, averaging 4.5°C.
For December in Smyrna, pack warm layers and a jacket for chilly mornings, with typical highs of 9.4°C and lows of -0.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 84% — quite humid.
Average wind speed in December is 1.9 m/s. The windiest December on record averaged 2.3 m/s (1982).
The wettest December on record was 1990 with 358 mm. On average, December sees 129 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 Smyrna 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.
