December is one of the cooler months of the year in Apache Junction, with average highs near 16.5°C and lows around 3.2°C (mean 9.9°C). It is a relatively wet time of year, averaging 43 mm of rainfall and 51% relative humidity across the period.
December is one of the cooler months of the year in Apache Junction. Across 45 years of records, the warmest December in Apache Junction was 2025 — when the month averaged 14.5°C — while the coldest was 1990 at 7.1°C. Typical December days reach 16.5°C with nights near 3.2°C. The long-term trend is warming, about 0.6°C per decade.
December is a relatively wet time of year in Apache Junction, averaging 43 mm of rainfall. The wettest December on record was 1984 with 142 mm, while the driest was 2024 at 0 mm.
Relative humidity in Apache Junction during December averages 51%. The most humid December was 1984 at 71%, and the least humid was 2017 at 27%.
December receives about 3.1 kWh/m²/day of solar energy in Apache Junction. The sunniest Decembers were 1985 and 1999 at 3.4 kWh/m²/day, and the cloudiest was 1984 at 2.5.
Average wind speed in Apache Junction during December is 2.1 m/s. The windiest December was 1990 at 2.6 m/s, while the calmest was 2014 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.2°C | 9.1°C | 9.4°C | 10.2°C | 12.2°C | +3°C |
| Avg High | 15.8°C | 15.8°C | 16.2°C | 16.6°C | 19.0°C | +3.2°C |
| Avg Low | 2.7°C | 2.5°C | 2.5°C | 3.8°C | 5.4°C | +2.7°C |
| Avg Rain | 50 mm | 50 mm | 38 mm | 43 mm | 33 mm | -17 mm |
December temperatures in Apache Junction have risen by about 3.1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -13.1°C (1990) to a record high of 26.9°C (2021).
Rainfall in December is a relatively wet time of year, averaging 43 mm, with a wettest year of 142 mm.
A quieter season to visit Apache Junction
If your dates are flexible, the more temperate months of May and October tend to be the most comfortable for visiting Apache Junction. That said, December — with days averaging 16.5°C and nights around 3.2°C (mean 9.9°C) and moderate rainfall (43 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 🔥 | 21.7°C | 14.5°C | 7.3°C | 26.4°C | 1.4°C | 3 mm | 48% | 2 m/s | — |
| 2024 | 21.8°C | 14.3°C | 6.8°C | 26.6°C | 0.8°C | 0 mm | 29% | 1.9 m/s | 3.3 |
| 2023 | 19.0°C | 12.1°C | 5.3°C | 25.1°C | -1.4°C | 33 mm | 42% | 2.1 m/s | 3.1 |
| 2022 | 15.9°C | 10.0°C | 4.1°C | 22.7°C | -2.6°C | 68 mm | 60% | 1.8 m/s | 2.8 |
| 2021 | 18.0°C | 12.0°C | 6.0°C | 26.9°C | -1.2°C | 83 mm | 52% | 1.9 m/s | 2.9 |
| 2020 | 17.5°C | 10.2°C | 2.8°C | 24.9°C | -2.3°C | 10 mm | 34% | 2.2 m/s | 3.3 |
| 2019 | 15.4°C | 9.5°C | 3.6°C | 20.8°C | -3.9°C | 58 mm | 60% | 2.1 m/s | 2.7 |
| 2018 | 16.4°C | 9.9°C | 3.4°C | 22.4°C | -3.4°C | 20 mm | 51% | 1.9 m/s | 2.9 |
| 2017 | 20.3°C | 13.2°C | 6.0°C | 25.8°C | -2.0°C | 3 mm | 27% | 2.1 m/s | 3.2 |
| 2016 | 17.4°C | 11.2°C | 5.1°C | 23.8°C | -2.2°C | 66 mm | 56% | 2.1 m/s | 2.9 |
| 2015 | 15.0°C | 8.5°C | 2.0°C | 23.7°C | -3.1°C | 23 mm | 49% | 1.9 m/s | 3 |
| 2014 | 16.1°C | 10.4°C | 4.6°C | 23.6°C | -3.0°C | 55 mm | 57% | 1.7 m/s | 2.8 |
| 2013 | 16.2°C | 9.4°C | 2.6°C | 24.4°C | -3.1°C | 15 mm | 49% | 2.4 m/s | 3.3 |
| 2012 | 15.8°C | 9.7°C | 3.6°C | 26.0°C | -3.2°C | 64 mm | 48% | 2 m/s | 3.1 |
| 2011 | 14.3°C | 7.9°C | 1.5°C | 24.0°C | -4.6°C | 67 mm | 58% | 2.1 m/s | 2.9 |
| 2010 | 18.7°C | 12.1°C | 5.5°C | 26.1°C | -8.0°C | 63 mm | 48% | 2.1 m/s | 2.8 |
| 2009 | 14.1°C | 7.8°C | 1.5°C | 21.3°C | -3.6°C | 46 mm | 51% | 2.1 m/s | 3 |
| 2008 | 15.5°C | 9.2°C | 2.9°C | 23.9°C | -4.1°C | 100 mm | 57% | 2.2 m/s | 2.8 |
| 2007 | 14.0°C | 7.6°C | 1.1°C | 25.5°C | -4.4°C | 85 mm | 55% | 2.1 m/s | 3.2 |
| 2006 | 16.8°C | 9.5°C | 2.3°C | 23.3°C | -3.4°C | 9 mm | 43% | 2.2 m/s | 3.2 |
| 2005 | 19.1°C | 11.7°C | 4.3°C | 24.9°C | -0.7°C | 1 mm | 28% | 2 m/s | 3.2 |
| 2004 | 16.7°C | 9.8°C | 2.9°C | 24.4°C | -3.9°C | 63 mm | 52% | 2.3 m/s | 3.1 |
| 2003 | 17.0°C | 10.0°C | 3.0°C | 25.6°C | -5.1°C | 16 mm | 44% | 2.3 m/s | 3.3 |
| 2002 | 15.4°C | 9.0°C | 2.6°C | 20.7°C | -2.8°C | 23 mm | 54% | 1.8 m/s | 3 |
| 2001 | 15.5°C | 8.4°C | 1.4°C | 22.6°C | -4.0°C | 31 mm | 49% | 2.1 m/s | 3.1 |
| 2000 | 18.4°C | 10.9°C | 3.4°C | 22.6°C | -1.6°C | 3 mm | 47% | 2.1 m/s | 3.3 |
| 1999 | 17.6°C | 10.0°C | 2.3°C | 22.6°C | -1.9°C | 1 mm | 30% | 2.5 m/s | 3.4 |
| 1998 | 16.8°C | 9.7°C | 2.6°C | 23.9°C | -4.2°C | 14 mm | 52% | 2.3 m/s | 3.2 |
| 1997 | 13.8°C | 7.6°C | 1.3°C | 19.6°C | -4.2°C | 61 mm | 58% | 2.3 m/s | 3.1 |
| 1996 | 17.3°C | 10.2°C | 3.1°C | 23.7°C | -4.8°C | 3 mm | 43% | 2.2 m/s | 3.3 |
| 1995 | 17.8°C | 10.8°C | 3.9°C | 24.6°C | -1.1°C | 8 mm | 44% | 1.9 m/s | 3.1 |
| 1994 | 15.7°C | 9.5°C | 3.3°C | 22.0°C | -2.1°C | 86 mm | 59% | 2.3 m/s | 2.9 |
| 1993 | 16.6°C | 9.4°C | 2.1°C | 22.4°C | -3.6°C | 8 mm | 48% | 2.4 m/s | 3.3 |
| 1992 | 13.5°C | 7.6°C | 1.8°C | 20.3°C | -3.3°C | 138 mm | 65% | 2.1 m/s | 2.8 |
| 1991 | 15.0°C | 9.3°C | 3.7°C | 21.2°C | -5.0°C | 81 mm | 65% | 2.4 m/s | 2.8 |
| 1990 ❄️ | 13.7°C | 7.1°C | 0.6°C | 23.0°C | -13.1°C | 100 mm | 57% | 2.6 m/s | 3 |
| 1989 | 17.8°C | 10.4°C | 3.0°C | 25.0°C | -2.8°C | 19 mm | 37% | 2.3 m/s | 3.3 |
| 1988 | 15.3°C | 8.7°C | 2.0°C | 21.6°C | -5.2°C | 16 mm | 49% | 2.5 m/s | 3.2 |
| 1987 | 13.5°C | 7.3°C | 1.1°C | 23.7°C | -5.5°C | 54 mm | 57% | 2 m/s | 2.9 |
| 1986 | 15.5°C | 9.1°C | 2.7°C | 22.4°C | -3.3°C | 61 mm | 60% | 2.1 m/s | 2.9 |
| 1985 | 17.1°C | 9.9°C | 2.8°C | 22.2°C | -5.2°C | 22 mm | 53% | 2.3 m/s | 3.4 |
| 1984 🌧️ | 14.2°C | 8.7°C | 3.2°C | 22.3°C | -3.1°C | 142 mm | 71% | 2.2 m/s | 2.5 |
| 1983 | 15.3°C | 9.1°C | 2.9°C | 21.3°C | -2.3°C | 65 mm | 67% | 2.1 m/s | — |
| 1982 | 14.3°C | 8.1°C | 1.9°C | 22.4°C | -2.9°C | 65 mm | 63% | 2.5 m/s | — |
| 1981 | 19.1°C | 11.8°C | 4.6°C | 25.8°C | -1.5°C | 6 mm | 47% | 2.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 16.5°C with lows near 3.2°C (mean 9.9°C), based on 45 years of NASA POWER data.
December averages 43 mm of rainfall in Apache Junction, a relatively wet time of year. The wettest on record was 142 mm in 1984.
The hottest December reached 26.9°C in 2021. The coldest dipped to -13.1°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.1°C. Daytime highs moved from 16°C to 19.3°C and overnight lows from 3.1°C to 5.9°C over the same span.
December is one of the cooler months of the year in Apache Junction and a relatively wet time of year, so plan for around 16.5°C daytime highs and 3.2°C at night.
Not quite — December is the 2nd coolest month in Apache Junction, averaging 9.9°C.
For December in Apache Junction, pack warm layers and a jacket for chilly mornings, with typical highs of 16.5°C and lows of 3.2°C.
Relative humidity in December averages 51% — relatively dry.
Average wind speed in December is 2.1 m/s. The windiest December on record averaged 2.6 m/s (1990).
The wettest December on record was 1984 with 142 mm. On average, December sees 43 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 Apache Junction 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.
