December is one of the warmer months of the year in Ayr, with average highs near 29.5°C and lows around 25.8°C (mean 27.7°C). It is a relatively wet time of year, averaging 115 mm of rainfall and 74% relative humidity across the period.
December is one of the warmer months of the year in Ayr. Across 45 years of records, the warmest December in Ayr was 2005 — when the month averaged 29.1°C — while the coldest were 1999 and 2000 at 26.1°C. Typical December days reach 29.5°C with nights near 25.8°C. The long-term December temperature trend is broadly flat.
December is a relatively wet time of year in Ayr, averaging 115 mm of rainfall. The wettest December on record was 1990 with 503 mm, while the driest was 2013 at 11 mm.
Relative humidity in Ayr during December averages 74%. The most humid December was 2010 at 85%, and the least humid was 2005 at 69%.
December receives about 6.9 kWh/m²/day of solar energy in Ayr. The sunniest Decembers were 1985 and 2017 at 7.8 kWh/m²/day, and the cloudiest was 2010 at 5.5.
Average wind speed in Ayr during December is 4.8 m/s. The windiest Decembers were 1983, 1990 and 2018 at 5.9 m/s, while the calmest was 1981 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.4°C | 27.4°C | 27.8°C | 27.7°C | 28.0°C | +0.6°C |
| Avg High | 29.4°C | 29.3°C | 29.6°C | 29.5°C | 29.8°C | +0.4°C |
| Avg Low | 25.5°C | 25.5°C | 26.0°C | 25.9°C | 26.2°C | +0.7°C |
| Avg Rain | 103 mm | 154 mm | 84 mm | 95 mm | 154 mm | +51 mm |
December temperatures in Ayr have risen by about 0.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 21.4°C (1989) to a record high of 38.8°C (1995).
Rainfall in December is a relatively wet time of year, averaging 115 mm, with a wettest year of 503 mm.
A quieter season to visit Ayr
If your dates are flexible, the more temperate months of August and June tend to be the most comfortable for visiting Ayr. That said, December — with days averaging 29.5°C and nights around 25.8°C (mean 27.7°C) and higher rainfall (115 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.7°C | 28.0°C | 26.3°C | 32.6°C | 24.9°C | 191 mm | 72% | 5 m/s | — |
| 2024 | 29.8°C | 28.1°C | 26.4°C | 32.7°C | 24.6°C | 274 mm | 79% | 4.2 m/s | 6.4 |
| 2023 | 29.8°C | 28.2°C | 26.6°C | 31.2°C | 25.4°C | 109 mm | 78% | 5.2 m/s | 6.3 |
| 2022 | 29.5°C | 27.6°C | 25.6°C | 31.7°C | 22.0°C | 82 mm | 73% | 5 m/s | 7 |
| 2021 | 29.9°C | 28.1°C | 26.2°C | 32.2°C | 23.9°C | 165 mm | 74% | 4.4 m/s | 7.1 |
| 2020 | 29.8°C | 28.0°C | 26.3°C | 31.8°C | 24.5°C | 103 mm | 76% | 4.6 m/s | 6.6 |
| 2019 | 30.0°C | 28.0°C | 25.9°C | 33.2°C | 24.6°C | 30 mm | 72% | 5 m/s | 7.6 |
| 2018 | 29.6°C | 28.0°C | 26.3°C | 31.7°C | 24.8°C | 185 mm | 80% | 5.9 m/s | 6 |
| 2017 | 29.7°C | 27.8°C | 25.8°C | 30.6°C | 24.9°C | 17 mm | 71% | 4.6 m/s | 7.8 |
| 2016 | 29.6°C | 27.8°C | 26.0°C | 30.6°C | 25.0°C | 35 mm | 73% | 4.7 m/s | 7.1 |
| 2015 | 29.5°C | 27.8°C | 26.1°C | 30.7°C | 25.1°C | 56 mm | 71% | 5.2 m/s | 7 |
| 2014 | 29.9°C | 28.0°C | 26.2°C | 32.7°C | 25.1°C | 49 mm | 73% | 4.4 m/s | 7.1 |
| 2013 | 29.1°C | 27.1°C | 25.2°C | 31.2°C | 23.9°C | 11 mm | 70% | 5.1 m/s | 7.6 |
| 2012 | 29.4°C | 27.5°C | 25.6°C | 31.6°C | 24.4°C | 75 mm | 71% | 5.1 m/s | 7 |
| 2011 | 29.7°C | 27.8°C | 25.8°C | 33.9°C | 22.3°C | 124 mm | 76% | 4.9 m/s | 6.2 |
| 2010 | 28.6°C | 27.3°C | 26.1°C | 30.6°C | 24.7°C | 370 mm | 85% | 4.2 m/s | 5.5 |
| 2009 | 29.6°C | 27.9°C | 26.1°C | 31.2°C | 23.7°C | 65 mm | 71% | 4.8 m/s | 7.2 |
| 2008 | 30.4°C | 28.6°C | 26.7°C | 33.0°C | 24.5°C | 106 mm | 73% | 4.3 m/s | 7.1 |
| 2007 | 29.5°C | 27.7°C | 25.8°C | 31.8°C | 24.2°C | 128 mm | 74% | 4.6 m/s | 6.6 |
| 2006 | 28.4°C | 26.6°C | 24.8°C | 29.8°C | 23.4°C | 59 mm | 72% | 5.5 m/s | 6.9 |
| 2005 🔥 | 31.1°C | 29.1°C | 27.1°C | 36.8°C | 26.1°C | 26 mm | 69% | 4.6 m/s | 7.3 |
| 2004 | 29.3°C | 27.6°C | 25.9°C | 31.9°C | 24.4°C | 95 mm | 75% | 4.6 m/s | 6.8 |
| 2003 | 29.9°C | 28.1°C | 26.2°C | 32.3°C | 24.7°C | 83 mm | 73% | 5 m/s | 7 |
| 2002 | 29.7°C | 27.9°C | 26.1°C | 33.6°C | 25.0°C | 23 mm | 70% | 5.2 m/s | 7.4 |
| 2001 | 30.7°C | 28.7°C | 26.8°C | 33.4°C | 24.6°C | 48 mm | 74% | 4.3 m/s | 7.5 |
| 2000 | 27.6°C | 26.1°C | 24.6°C | 28.6°C | 23.1°C | 202 mm | 78% | 5.1 m/s | 6.2 |
| 1999 ❄️ | 28.2°C | 26.1°C | 24.0°C | 32.1°C | 22.3°C | 175 mm | 76% | 5.6 m/s | 6.7 |
| 1998 | 29.5°C | 27.7°C | 25.8°C | 31.9°C | 23.4°C | 157 mm | 76% | 4.9 m/s | 6.7 |
| 1997 | 29.0°C | 27.7°C | 26.3°C | 30.4°C | 25.6°C | 244 mm | 78% | 4.3 m/s | 6.2 |
| 1996 | 29.8°C | 28.0°C | 26.1°C | 31.0°C | 24.7°C | 57 mm | 72% | 5.2 m/s | 7.4 |
| 1995 | 30.9°C | 28.6°C | 26.3°C | 38.8°C | 24.1°C | 79 mm | 72% | 4.7 m/s | 7.2 |
| 1994 | 28.7°C | 26.7°C | 24.8°C | 30.3°C | 23.6°C | 68 mm | 72% | 5.1 m/s | 7.2 |
| 1993 | 29.2°C | 27.2°C | 25.2°C | 34.1°C | 23.8°C | 42 mm | 71% | 5.3 m/s | 7.2 |
| 1992 | 28.9°C | 27.0°C | 25.2°C | 31.8°C | 23.5°C | 144 mm | 75% | 5 m/s | 6.7 |
| 1991 | 30.2°C | 28.1°C | 26.0°C | 34.0°C | 23.9°C | 76 mm | 75% | 4.2 m/s | 7.4 |
| 1990 🌧️ | 29.0°C | 27.3°C | 25.7°C | 31.3°C | 24.6°C | 503 mm | 78% | 5.9 m/s | 6.2 |
| 1989 | 28.4°C | 26.4°C | 24.4°C | 32.1°C | 21.4°C | 97 mm | 75% | 4.5 m/s | 7.5 |
| 1988 | 29.1°C | 27.3°C | 25.5°C | 32.7°C | 23.2°C | 301 mm | 79% | 4.7 m/s | 6.1 |
| 1987 | 29.0°C | 27.2°C | 25.3°C | 31.0°C | 24.1°C | 158 mm | 73% | 5.1 m/s | 7.1 |
| 1986 | 29.3°C | 27.5°C | 25.7°C | 30.5°C | 24.5°C | 55 mm | 72% | 4.6 m/s | 7.6 |
| 1985 | 30.1°C | 28.2°C | 26.4°C | 31.6°C | 25.3°C | 63 mm | 75% | 4 m/s | 7.8 |
| 1984 | 30.1°C | 28.1°C | 26.1°C | 36.6°C | 23.1°C | 105 mm | 77% | 4.6 m/s | 7.3 |
| 1983 | 28.8°C | 26.8°C | 24.7°C | 34.3°C | 23.3°C | 49 mm | 71% | 5.9 m/s | — |
| 1982 | 29.3°C | 27.2°C | 25.1°C | 34.2°C | 23.4°C | 55 mm | 72% | 4.6 m/s | — |
| 1981 | 30.3°C | 28.3°C | 26.4°C | 35.0°C | 24.8°C | 48 mm | 76% | 3.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 29.5°C with lows near 25.8°C (mean 27.7°C), based on 45 years of NASA POWER data.
December averages 115 mm of rainfall in Ayr, a relatively wet time of year. The wettest on record was 503 mm in 1990.
The hottest December reached 38.8°C in 1995. The coldest dipped to 21.4°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.3°C. Daytime highs moved from 29.7°C to 29.7°C and overnight lows from 25.7°C to 26.2°C over the same span.
December is one of the warmer months of the year in Ayr and a relatively wet time of year, so plan for around 29.5°C daytime highs and 25.8°C at night.
Not quite — December is the 10th coolest month in Ayr, averaging 27.7°C.
For December in Ayr, pack light layers you can adjust through the day, with typical highs of 29.5°C and lows of 25.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 74% — moderately humid.
Average wind speed in December is 4.8 m/s. The windiest December on record averaged 5.9 m/s (1983).
The wettest December on record was 1990 with 503 mm. On average, December sees 115 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 Ayr 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.
