December is one of the cooler months of the year in As Sulayyil, with average highs near 25.5°C and lows around 11.1°C (mean 18.3°C). It is about average for rainfall, averaging 1 mm of rainfall and 38% relative humidity across the period.
December is one of the cooler months of the year in As Sulayyil. Across 45 years of records, the warmest December in As Sulayyil was 2001 — when the month averaged 20.8°C — while the coldest was 2011 at 14.8°C. Typical December days reach 25.5°C with nights near 11.1°C. The long-term trend is warming, about 0.2°C per decade.
December is about average for rainfall in As Sulayyil, averaging 1 mm of rainfall. The wettest December on record was 1986 with 12 mm, while the driest were 2023, 2024 and 2025, among others at 0 mm.
Relative humidity in As Sulayyil during December averages 38%. The most humid December was 1982 at 49%, and the least humid was 2017 at 28%.
December receives about 4.8 kWh/m²/day of solar energy in As Sulayyil. The sunniest Decembers were 2008 and 2017 at 5.2 kWh/m²/day, and the cloudiest was 1995 at 3.9.
Average wind speed in As Sulayyil during December is 2.9 m/s. The windiest Decembers were 1995 and 1997 at 3.6 m/s, while the calmest was 2017 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.5°C | 18.8°C | 18.6°C | 18.0°C | 18.7°C | +1.2°C |
| Avg High | 24.6°C | 26.0°C | 25.8°C | 25.3°C | 26.0°C | +1.4°C |
| Avg Low | 10.4°C | 11.7°C | 11.4°C | 10.7°C | 11.3°C | +0.9°C |
| Avg Rain | 5 mm | 0 mm | 0 mm | 0 mm | 0 mm | -4 mm |
December temperatures in As Sulayyil have risen by about 1.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 2.2°C (2008) to a record high of 33.2°C (2006).
Rainfall in December is about average for rainfall, averaging 1 mm, with a wettest year of 12 mm.
One of the best times to visit As Sulayyil
December is one of the best times to visit As Sulayyil. Expect days averaging 25.5°C and nights around 11.1°C (mean 18.3°C) — cooler than As Sulayyil's yearly average — with low rainfall (1 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 | 26.2°C | 18.8°C | 11.4°C | 31.0°C | 5.5°C | 0 mm | 33% | 2.5 m/s | — |
| 2024 | 25.9°C | 18.4°C | 10.8°C | 30.2°C | 7.0°C | 0 mm | 32% | 2.7 m/s | 4.9 |
| 2023 | 26.4°C | 18.9°C | 11.3°C | 31.1°C | 6.1°C | 0 mm | 34% | 2.5 m/s | 5 |
| 2022 | 26.0°C | 19.3°C | 12.6°C | 29.8°C | 9.5°C | 2 mm | 39% | 2.9 m/s | 4.7 |
| 2021 | 25.8°C | 18.2°C | 10.6°C | 29.5°C | 6.2°C | 0 mm | 37% | 2.6 m/s | 4.9 |
| 2020 | 25.7°C | 18.5°C | 11.3°C | 31.5°C | 6.2°C | 0 mm | 40% | 3 m/s | 4.9 |
| 2019 | 27.1°C | 20.4°C | 13.7°C | 32.6°C | 8.2°C | 0 mm | 38% | 2.6 m/s | 4.7 |
| 2018 | 27.1°C | 19.7°C | 12.2°C | 30.9°C | 7.3°C | 0 mm | 38% | 2.8 m/s | 4.9 |
| 2017 | 23.6°C | 16.0°C | 8.3°C | 28.8°C | 4.0°C | 0 mm | 28% | 2.2 m/s | 5.2 |
| 2016 | 27.1°C | 19.3°C | 11.5°C | 32.9°C | 8.8°C | 0 mm | 37% | 2.8 m/s | 5 |
| 2015 | 25.0°C | 18.5°C | 12.0°C | 30.9°C | 9.3°C | 0 mm | 40% | 3.3 m/s | 4.4 |
| 2014 | 25.2°C | 17.9°C | 10.6°C | 27.6°C | 7.3°C | 0 mm | 36% | 2.8 m/s | 4.9 |
| 2013 | 24.5°C | 17.1°C | 9.6°C | 31.1°C | 4.5°C | 0 mm | 32% | 2.9 m/s | 4.9 |
| 2012 | 26.5°C | 19.6°C | 12.7°C | 31.7°C | 8.6°C | 0 mm | 43% | 3.1 m/s | 4.5 |
| 2011 ❄️ | 22.5°C | 14.8°C | 7.1°C | 27.2°C | 4.2°C | 0 mm | 31% | 2.4 m/s | 5.1 |
| 2010 | 24.3°C | 16.8°C | 9.4°C | 29.8°C | 5.7°C | 0 mm | 30% | 2.4 m/s | 4.9 |
| 2009 | 27.0°C | 20.4°C | 13.8°C | 32.7°C | 8.5°C | 0 mm | 42% | 3.2 m/s | 4.6 |
| 2008 | 23.3°C | 15.2°C | 7.1°C | 27.2°C | 2.2°C | 0 mm | 29% | 2.4 m/s | 5.2 |
| 2007 | 25.5°C | 17.7°C | 10.0°C | 28.6°C | 6.7°C | 0 mm | 37% | 2.9 m/s | 4.9 |
| 2006 | 24.0°C | 18.2°C | 12.3°C | 33.2°C | 6.7°C | 0 mm | 45% | 3.5 m/s | 4.3 |
| 2005 | 26.4°C | 18.5°C | 10.7°C | 30.9°C | 7.2°C | 0 mm | 30% | 2.5 m/s | 5 |
| 2004 | 25.2°C | 18.7°C | 12.3°C | 31.1°C | 4.6°C | 0 mm | 43% | 3.3 m/s | 4.7 |
| 2003 | 26.2°C | 19.0°C | 11.8°C | 31.2°C | 7.9°C | 0 mm | 44% | 3.1 m/s | 4.8 |
| 2002 | 26.2°C | 19.5°C | 12.7°C | 31.4°C | 7.3°C | 0 mm | 41% | 3.3 m/s | 4.7 |
| 2001 🔥 | 28.8°C | 20.8°C | 12.9°C | 32.7°C | 8.3°C | 0 mm | 39% | 3 m/s | 4.9 |
| 2000 | 25.6°C | 18.2°C | 10.8°C | 31.6°C | 4.9°C | 0 mm | 36% | 2.9 m/s | 4.9 |
| 1999 | 25.0°C | 17.6°C | 10.2°C | 29.6°C | 5.7°C | 0 mm | 38% | 2.6 m/s | 5.1 |
| 1998 | 26.7°C | 18.8°C | 11.0°C | 29.1°C | 8.1°C | 2 mm | 34% | 2.3 m/s | 4.9 |
| 1997 | 27.0°C | 20.6°C | 14.2°C | 31.1°C | 10.7°C | 0 mm | 42% | 3.6 m/s | 4.7 |
| 1996 | 25.1°C | 17.7°C | 10.4°C | 28.0°C | 6.3°C | 0 mm | 38% | 2.8 m/s | 4.9 |
| 1995 | 25.7°C | 19.5°C | 13.3°C | 31.7°C | 10.9°C | 0 mm | 46% | 3.6 m/s | 3.9 |
| 1994 | 24.9°C | 17.8°C | 10.7°C | 31.7°C | 4.3°C | 0 mm | 39% | 3.5 m/s | 4.9 |
| 1993 | 25.5°C | 17.8°C | 10.1°C | 28.8°C | 5.8°C | 0 mm | 37% | 2.6 m/s | 5.1 |
| 1992 | 26.5°C | 20.1°C | 13.7°C | 30.8°C | 8.6°C | 1 mm | 44% | 3.4 m/s | 4.5 |
| 1991 | 27.6°C | 20.4°C | 13.3°C | 32.5°C | 8.1°C | 0 mm | 39% | 2.8 m/s | 4.8 |
| 1990 | 26.1°C | 18.1°C | 10.1°C | 28.4°C | 4.3°C | 0 mm | 33% | 2.4 m/s | 4.9 |
| 1989 | 24.6°C | 18.7°C | 12.8°C | 31.0°C | 7.9°C | 0 mm | 42% | 3.4 m/s | 4.4 |
| 1988 | 25.4°C | 17.7°C | 9.9°C | 30.7°C | 6.5°C | 0 mm | 38% | 2.6 m/s | 4.7 |
| 1987 | 25.5°C | 18.1°C | 10.6°C | 30.0°C | 6.8°C | 0 mm | 37% | 2.9 m/s | 4.4 |
| 1986 🌧️ | 24.2°C | 17.2°C | 10.3°C | 31.2°C | 4.8°C | 12 mm | 45% | 3.1 m/s | 4.5 |
| 1985 | 24.8°C | 17.5°C | 10.2°C | 31.8°C | 5.4°C | 10 mm | 37% | 2.7 m/s | 4.5 |
| 1984 | 24.8°C | 17.9°C | 11.0°C | 31.2°C | 6.5°C | 7 mm | 43% | 3.1 m/s | 4.2 |
| 1983 | 23.6°C | 16.4°C | 9.3°C | 28.7°C | 4.2°C | 0 mm | 37% | 2.9 m/s | — |
| 1982 | 22.9°C | 16.5°C | 10.1°C | 30.8°C | 6.5°C | 5 mm | 49% | 3.3 m/s | — |
| 1981 | 25.3°C | 17.2°C | 9.1°C | 28.2°C | 6.3°C | 8 mm | 37% | 2.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.5°C with lows near 11.1°C (mean 18.3°C), based on 45 years of NASA POWER data.
December averages 1 mm of rainfall in As Sulayyil, about average for rainfall. The wettest on record was 12 mm in 1986.
The hottest December reached 33.2°C in 2006. The coldest dipped to 2.2°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.6°C. Daytime highs moved from 24.3°C to 26.1°C and overnight lows from 9.9°C to 11.3°C over the same span.
December is one of the cooler months of the year in As Sulayyil and about average for rainfall, so plan for around 25.5°C daytime highs and 11.1°C at night.
Not quite — December is the 2nd coolest month in As Sulayyil, averaging 18.3°C.
For December in As Sulayyil, pack light layers you can adjust through the day, with typical highs of 25.5°C and lows of 11.1°C.
Relative humidity in December averages 38% — relatively dry.
Average wind speed in December is 2.9 m/s. The windiest December on record averaged 3.6 m/s (1995).
The wettest December on record was 1986 with 12 mm. On average, December sees 1 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 As Sulayyil 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.
