January is one of the cooler months of the year in Keller, with average highs near 12.5°C and lows around 0.3°C (mean 6.4°C). It is one of the drier months, averaging 44 mm of rainfall and 73% relative humidity across the period.
January is one of the cooler months of the year in Keller. Across 45 years of records, the warmest January in Keller was 2006 — when the month averaged 11.9°C — while the coldest was 1985 at 1.9°C. Typical January days reach 12.5°C with nights near 0.3°C. The long-term trend is warming, about 0.3°C per decade.
January is one of the drier months in Keller, averaging 44 mm of rainfall. The wettest January on record was 2012 with 142 mm, while the driest was 1986 at 0 mm.
Relative humidity in Keller during January averages 73%. The most humid January was 1998 at 87%, and the least humid was 2006 at 46%.
January receives about 3 kWh/m²/day of solar energy in Keller. The sunniest January was 2014 at 3.6 kWh/m²/day, and the cloudiest was 1993 at 2.2.
Average wind speed in Keller during January is 3.1 m/s. The windiest January was 1996 at 4.1 m/s, while the calmest were 1981 and 2011 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.2°C | 6.4°C | 7.3°C | 6.3°C | 6.8°C | +1.6°C |
| Avg High | 11.3°C | 12.2°C | 13.6°C | 12.4°C | 12.9°C | +1.6°C |
| Avg Low | -0.8°C | 0.6°C | 0.9°C | 0.2°C | 0.7°C | +1.5°C |
| Avg Rain | 31 mm | 56 mm | 41 mm | 51 mm | 39 mm | +8 mm |
January temperatures in Keller have risen by about 2°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -14.7°C (1982) to a record high of 29.4°C (2006).
Rainfall in January is one of the drier months, averaging 44 mm, with a wettest year of 142 mm.
A quieter season to visit Keller
If your dates are flexible, the more temperate months of May and October tend to be the most comfortable for visiting Keller. That said, January — with days averaging 12.5°C and nights around 0.3°C (mean 6.4°C) and moderate rainfall (44 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 | 10.6°C | 4.7°C | -1.3°C | 19.8°C | -7.1°C | 53 mm | 69% | 3 m/s | 3.2 |
| 2024 | 10.0°C | 4.4°C | -1.2°C | 22.4°C | -12.7°C | 61 mm | 72% | 3.2 m/s | 3 |
| 2023 | 15.3°C | 9.2°C | 3.1°C | 25.0°C | -4.1°C | 25 mm | 69% | 3.3 m/s | 3 |
| 2022 | 14.2°C | 6.6°C | -1.0°C | 24.3°C | -8.0°C | 3 mm | 54% | 3.3 m/s | 3.4 |
| 2021 | 12.6°C | 7.0°C | 1.5°C | 20.5°C | -3.8°C | 20 mm | 75% | 3 m/s | 3 |
| 2020 | 14.9°C | 9.0°C | 3.1°C | 24.1°C | -1.8°C | 72 mm | 77% | 3.1 m/s | 2.7 |
| 2019 | 11.5°C | 5.9°C | 0.2°C | 20.3°C | -5.2°C | 28 mm | 79% | 3.2 m/s | 2.8 |
| 2018 | 12.4°C | 5.7°C | -1.0°C | 23.4°C | -8.2°C | 4 mm | 62% | 3.4 m/s | 3.4 |
| 2017 | 14.8°C | 8.7°C | 2.5°C | 25.1°C | -7.5°C | 66 mm | 69% | 3.2 m/s | 3 |
| 2016 | 11.7°C | 5.9°C | 0.2°C | 21.3°C | -4.7°C | 14 mm | 81% | 2.8 m/s | 3.2 |
| 2015 | 10.7°C | 5.4°C | 0.1°C | 23.8°C | -7.4°C | 83 mm | 74% | 2.8 m/s | 2.9 |
| 2014 | 12.5°C | 5.6°C | -1.4°C | 23.3°C | -9.1°C | 5 mm | 61% | 3.7 m/s | 3.6 |
| 2013 | 13.8°C | 7.7°C | 1.6°C | 25.4°C | -5.4°C | 72 mm | 74% | 2.9 m/s | 2.9 |
| 2012 🌧️ | 14.7°C | 8.3°C | 1.9°C | 22.8°C | -4.5°C | 142 mm | 74% | 3.3 m/s | 3.4 |
| 2011 | 11.1°C | 4.7°C | -1.7°C | 23.5°C | -10.9°C | 30 mm | 70% | 2.5 m/s | 3.1 |
| 2010 | 11.0°C | 5.3°C | -0.4°C | 21.2°C | -10.7°C | 69 mm | 79% | 2.9 m/s | 2.8 |
| 2009 | 14.6°C | 7.1°C | -0.3°C | 27.4°C | -7.5°C | 15 mm | 57% | 3.3 m/s | 3.5 |
| 2008 | 12.5°C | 6.3°C | 0.0°C | 24.0°C | -5.6°C | 7 mm | 67% | 3.5 m/s | 2.9 |
| 2007 | 9.4°C | 4.0°C | -1.3°C | 20.7°C | -6.5°C | 71 mm | 79% | 2.8 m/s | 2.5 |
| 2006 🔥 | 19.5°C | 11.9°C | 4.4°C | 29.4°C | 0.0°C | 43 mm | 46% | 3.8 m/s | 3.3 |
| 2005 | 13.8°C | 8.4°C | 2.9°C | 23.1°C | -6.4°C | 57 mm | 82% | 3 m/s | 2.6 |
| 2004 | 14.9°C | 8.5°C | 2.0°C | 26.6°C | -6.5°C | 50 mm | 72% | 3.2 m/s | 2.8 |
| 2003 | 11.6°C | 5.4°C | -0.7°C | 22.3°C | -7.0°C | 7 mm | 76% | 3 m/s | 3.1 |
| 2002 | 14.5°C | 7.9°C | 1.2°C | 24.9°C | -6.7°C | 48 mm | 70% | 3.3 m/s | 3 |
| 2001 | 10.2°C | 4.7°C | -0.8°C | 17.3°C | -11.0°C | 71 mm | 83% | 2.8 m/s | 2.7 |
| 2000 | 14.8°C | 8.4°C | 1.9°C | 25.4°C | -7.2°C | 40 mm | 70% | 3.2 m/s | 3 |
| 1999 | 14.3°C | 8.0°C | 1.7°C | 23.4°C | -7.0°C | 48 mm | 76% | 3.5 m/s | 3.1 |
| 1998 | 13.4°C | 8.0°C | 2.6°C | 20.7°C | -2.8°C | 89 mm | 87% | 3.3 m/s | 2.6 |
| 1997 | 10.9°C | 5.2°C | -0.5°C | 25.0°C | -9.3°C | 19 mm | 73% | 3.4 m/s | 2.9 |
| 1996 | 12.2°C | 5.2°C | -1.8°C | 23.1°C | -8.4°C | 26 mm | 65% | 4.1 m/s | 3.1 |
| 1995 | 12.0°C | 6.3°C | 0.7°C | 20.7°C | -5.2°C | 43 mm | 79% | 3.2 m/s | 2.9 |
| 1994 | 11.5°C | 6.2°C | 0.9°C | 19.7°C | -6.9°C | 37 mm | 78% | 3.4 m/s | 2.7 |
| 1993 | 10.9°C | 5.4°C | 0.0°C | 20.5°C | -4.9°C | 56 mm | 84% | 2.6 m/s | 2.2 |
| 1992 | 10.9°C | 5.9°C | 0.8°C | 18.3°C | -7.0°C | 75 mm | 85% | 2.6 m/s | 2.8 |
| 1991 | 9.9°C | 4.5°C | -0.9°C | 16.3°C | -5.5°C | 73 mm | 81% | 2.9 m/s | 2.3 |
| 1990 | 16.2°C | 9.3°C | 2.5°C | 23.9°C | -4.6°C | 95 mm | 63% | 3.4 m/s | 3 |
| 1989 | 14.7°C | 8.6°C | 2.6°C | 23.8°C | -4.2°C | 72 mm | 74% | 3.1 m/s | 2.6 |
| 1988 | 9.5°C | 3.9°C | -1.7°C | 23.2°C | -10.8°C | 13 mm | 77% | 3.4 m/s | 3 |
| 1987 | 10.4°C | 4.7°C | -0.9°C | 19.2°C | -10.1°C | 48 mm | 80% | 3.1 m/s | 3.1 |
| 1986 | 15.3°C | 8.1°C | 0.9°C | 25.6°C | -5.6°C | 0 mm | 67% | 3.1 m/s | 3.4 |
| 1985 ❄️ | 7.7°C | 1.9°C | -4.0°C | 18.5°C | -12.3°C | 19 mm | 79% | 3.2 m/s | 2.9 |
| 1984 | 9.2°C | 3.4°C | -2.5°C | 21.6°C | -11.5°C | 23 mm | 73% | 2.7 m/s | 2.9 |
| 1983 | 11.0°C | 5.3°C | -0.3°C | 19.6°C | -4.6°C | 39 mm | 81% | 2.9 m/s | — |
| 1982 | 11.4°C | 4.9°C | -1.5°C | 22.4°C | -14.7°C | 57 mm | 70% | 3.8 m/s | — |
| 1981 | 12.9°C | 6.4°C | -0.1°C | 23.4°C | -6.5°C | 11 mm | 70% | 2.5 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 12.5°C with lows near 0.3°C (mean 6.4°C), based on 45 years of NASA POWER data.
January averages 44 mm of rainfall in Keller, one of the drier months. The wettest on record was 142 mm in 2012.
The hottest January reached 29.4°C in 2006. The coldest dipped to -14.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 2°C. Daytime highs moved from 10.4°C to 12.5°C and overnight lows from -1.7°C to 0.2°C over the same span.
January is one of the cooler months of the year in Keller and one of the drier months, so plan for around 12.5°C daytime highs and 0.3°C at night.
Yes — January is the coldest month of the year in Keller, averaging 6.4°C.
For January in Keller, pack warm layers and a jacket for chilly mornings, with typical highs of 12.5°C and lows of 0.3°C.
Relative humidity in January averages 73% — moderately humid.
Average wind speed in January is 3.1 m/s. The windiest January on record averaged 4.1 m/s (1996).
The wettest January on record was 2012 with 142 mm. On average, January sees 44 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 Keller behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
