December is one of the warmer months of the year in Kelso, with average highs near 25.9°C and lows around 12.1°C (mean 19°C). It is about average for rainfall, averaging 70 mm of rainfall and 57% relative humidity across the period.
December is one of the warmer months of the year in Kelso. Across 45 years of records, the warmest December in Kelso was 2019 — when the month averaged 22.4°C — while the coldest was 2022 at 16.2°C. Typical December days reach 25.9°C with nights near 12.1°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Kelso, averaging 70 mm of rainfall. The wettest December on record was 2010 with 187 mm, while the driest was 2019 at 4 mm.
Relative humidity in Kelso during December averages 57%. The most humid December was 2010 at 77%, and the least humid was 2019 at 35%.
December receives about 7.5 kWh/m²/day of solar energy in Kelso. The sunniest December was 2005 at 8.6 kWh/m²/day, and the cloudiest was 1992 at 6.5.
Average wind speed in Kelso during December is 0.7 m/s. The windiest Decembers were 2001, 2005 and 2020, among others at 0.8 m/s, while the calmest were 1998 and 2011 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.4°C | 18.4°C | 19.4°C | 19.8°C | 19.1°C | +0.7°C |
| Avg High | 25.3°C | 25.2°C | 26.4°C | 26.7°C | 25.8°C | +0.5°C |
| Avg Low | 11.5°C | 11.6°C | 12.3°C | 12.9°C | 12.4°C | +0.9°C |
| Avg Rain | 69 mm | 74 mm | 61 mm | 77 mm | 68 mm | -1 mm |
December temperatures in Kelso have risen by about 0.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 2.9°C (1987) to a record high of 38.8°C (2019).
Rainfall in December is about average for rainfall, averaging 70 mm, with a wettest year of 187 mm.
One of the best times to visit Kelso
December is one of the best times to visit Kelso. Expect days averaging 25.9°C and nights around 12.1°C (mean 19°C) — warmer than Kelso's yearly average — with moderate rainfall (70 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 | 27.6°C | 19.9°C | 12.2°C | 34.8°C | 3.3°C | 47 mm | 48% | 0.7 m/s | — |
| 2024 | 27.4°C | 20.6°C | 13.8°C | 34.0°C | 7.3°C | 69 mm | 57% | 0.6 m/s | 8.1 |
| 2023 | 27.7°C | 20.9°C | 14.1°C | 35.7°C | 9.4°C | 69 mm | 59% | 0.7 m/s | 7.4 |
| 2022 ❄️ | 22.8°C | 16.2°C | 9.5°C | 29.9°C | 3.4°C | 30 mm | 64% | 0.6 m/s | 7.7 |
| 2021 | 24.1°C | 18.2°C | 12.3°C | 28.9°C | 6.3°C | 85 mm | 71% | 0.6 m/s | 7.4 |
| 2020 | 25.0°C | 18.6°C | 12.2°C | 35.4°C | 6.2°C | 105 mm | 63% | 0.8 m/s | 7 |
| 2019 🔥 | 30.7°C | 22.4°C | 14.2°C | 38.8°C | 5.3°C | 4 mm | 35% | 0.7 m/s | 8 |
| 2018 | 28.5°C | 21.1°C | 13.8°C | 35.8°C | 6.1°C | 70 mm | 53% | 0.6 m/s | 7.8 |
| 2017 | 27.6°C | 20.7°C | 13.9°C | 36.5°C | 6.8°C | 85 mm | 59% | 0.7 m/s | 7.1 |
| 2016 | 27.5°C | 20.8°C | 14.2°C | 32.6°C | 5.6°C | 72 mm | 57% | 0.7 m/s | 7.3 |
| 2015 | 27.1°C | 20.0°C | 12.8°C | 34.6°C | 8.2°C | 71 mm | 52% | 0.7 m/s | 7.6 |
| 2014 | 25.7°C | 19.5°C | 13.3°C | 32.8°C | 8.2°C | 115 mm | 61% | 0.7 m/s | 7.2 |
| 2013 | 27.9°C | 20.1°C | 12.3°C | 35.3°C | 4.4°C | 39 mm | 47% | 0.7 m/s | 7.9 |
| 2012 | 27.4°C | 20.0°C | 12.6°C | 33.1°C | 5.9°C | 36 mm | 51% | 0.7 m/s | 7.4 |
| 2011 | 22.2°C | 16.3°C | 10.5°C | 27.6°C | 3.8°C | 91 mm | 70% | 0.5 m/s | 6.7 |
| 2010 🌧️ | 22.1°C | 16.8°C | 11.5°C | 29.2°C | 3.8°C | 187 mm | 77% | 0.7 m/s | 6.7 |
| 2009 | 27.4°C | 20.1°C | 12.8°C | 34.7°C | 5.9°C | 97 mm | 53% | 0.7 m/s | 7.4 |
| 2008 | 24.5°C | 17.9°C | 11.3°C | 28.6°C | 6.4°C | 95 mm | 58% | 0.7 m/s | 7.4 |
| 2007 | 24.2°C | 18.3°C | 12.4°C | 31.6°C | 7.9°C | 94 mm | 69% | 0.6 m/s | 6.7 |
| 2006 | 27.3°C | 19.9°C | 12.5°C | 34.1°C | 3.1°C | 46 mm | 50% | 0.7 m/s | 7 |
| 2005 | 27.1°C | 19.5°C | 11.9°C | 36.4°C | 6.2°C | 42 mm | 48% | 0.8 m/s | 8.6 |
| 2004 | 25.4°C | 18.5°C | 11.6°C | 32.2°C | 4.7°C | 95 mm | 60% | 0.7 m/s | 7.7 |
| 2003 | 27.6°C | 20.4°C | 13.2°C | 33.9°C | 6.5°C | 59 mm | 57% | 0.6 m/s | 7.3 |
| 2002 | 27.6°C | 20.0°C | 12.5°C | 34.6°C | 4.2°C | 42 mm | 49% | 0.7 m/s | 7.3 |
| 2001 | 26.4°C | 19.3°C | 12.1°C | 33.9°C | 6.4°C | 19 mm | 43% | 0.8 m/s | 7 |
| 2000 | 26.9°C | 19.8°C | 12.6°C | 32.3°C | 6.6°C | 20 mm | 55% | 0.6 m/s | 8.2 |
| 1999 | 23.0°C | 16.9°C | 10.9°C | 29.2°C | 5.6°C | 105 mm | 65% | 0.6 m/s | 7.1 |
| 1998 | 25.6°C | 18.9°C | 12.1°C | 30.6°C | 5.7°C | 40 mm | 62% | 0.5 m/s | 7.7 |
| 1997 | 28.8°C | 21.2°C | 13.7°C | 34.0°C | 9.7°C | 60 mm | 49% | 0.7 m/s | 7.7 |
| 1996 | 24.6°C | 17.6°C | 10.6°C | 31.7°C | 5.8°C | 84 mm | 57% | 0.7 m/s | 7.6 |
| 1995 | 23.8°C | 17.0°C | 10.2°C | 32.1°C | 3.5°C | 69 mm | 60% | 0.7 m/s | 7.6 |
| 1994 | 28.6°C | 20.6°C | 12.5°C | 36.0°C | 4.8°C | 62 mm | 52% | 0.7 m/s | 8.3 |
| 1993 | 23.9°C | 17.4°C | 10.9°C | 31.4°C | 5.3°C | 46 mm | 62% | 0.8 m/s | 6.9 |
| 1992 | 21.9°C | 16.5°C | 11.0°C | 27.0°C | 4.6°C | 161 mm | 75% | 0.6 m/s | 6.5 |
| 1991 | 23.4°C | 17.1°C | 10.7°C | 33.5°C | 4.8°C | 94 mm | 61% | 0.7 m/s | 6.9 |
| 1990 | 28.0°C | 20.6°C | 13.2°C | 34.4°C | 5.4°C | 21 mm | 53% | 0.7 m/s | 8.2 |
| 1989 | 26.2°C | 18.9°C | 11.6°C | 33.3°C | 5.8°C | 53 mm | 55% | 0.7 m/s | 7.8 |
| 1988 | 25.1°C | 19.1°C | 13.0°C | 31.0°C | 6.6°C | 138 mm | 68% | 0.7 m/s | 7.1 |
| 1987 | 25.7°C | 18.5°C | 11.3°C | 34.2°C | 2.9°C | 90 mm | 56% | 0.7 m/s | 7.4 |
| 1986 | 24.0°C | 16.8°C | 9.6°C | 30.4°C | 4.6°C | 30 mm | 54% | 0.7 m/s | 8.3 |
| 1985 | 23.2°C | 17.2°C | 11.2°C | 29.8°C | 6.0°C | 76 mm | 61% | 0.7 m/s | 7.5 |
| 1984 | 24.4°C | 17.4°C | 10.4°C | 32.8°C | 6.1°C | 33 mm | 49% | 0.8 m/s | 8 |
| 1983 | 24.1°C | 17.7°C | 11.2°C | 32.5°C | 5.5°C | 118 mm | 66% | 0.6 m/s | — |
| 1982 | 28.5°C | 20.9°C | 13.3°C | 34.7°C | 6.3°C | 17 mm | 43% | 0.7 m/s | — |
| 1981 | 26.4°C | 19.1°C | 11.8°C | 33.4°C | 6.7°C | 64 mm | 52% | 0.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.9°C with lows near 12.1°C (mean 19°C), based on 45 years of NASA POWER data.
December averages 70 mm of rainfall in Kelso, about average for rainfall. The wettest on record was 187 mm in 2010.
The hottest December reached 38.8°C in 2019. The coldest dipped to 2.9°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.7°C. Daytime highs moved from 25.3°C to 25.9°C and overnight lows from 11.6°C to 12.4°C over the same span.
December is one of the warmer months of the year in Kelso and about average for rainfall, so plan for around 25.9°C daytime highs and 12.1°C at night.
Not quite — December is the 10th coolest month in Kelso, averaging 19°C.
For December in Kelso, pack light layers you can adjust through the day, with typical highs of 25.9°C and lows of 12.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 57% — moderately humid.
Average wind speed in December is 0.7 m/s. The windiest December on record averaged 0.8 m/s (1984).
The wettest December on record was 2010 with 187 mm. On average, December sees 70 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 Kelso 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.
