December is close to Hagatna's year-round average, with average highs near 28.3°C and lows around 27.6°C (mean 28°C). It is one of the drier months, averaging 80 mm of rainfall and 79% relative humidity across the period.
December is close to Hagatna's year-round average. Across 45 years of records, the warmest December in Hagatna was 2024 — when the month averaged 28.8°C — while the coldest were 1982, 1991 and 1992 at 26.9°C. Typical December days reach 28.3°C with nights near 27.6°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Hagatna, averaging 80 mm of rainfall. The wettest December on record was 1997 with 206 mm, while the driest was 1992 at 21 mm.
Relative humidity in Hagatna during December averages 79%. The most humid December was 1986 at 82%, and the least humid was 1999 at 73%.
December receives about 4.8 kWh/m²/day of solar energy in Hagatna. The sunniest December was 2010 at 5.2 kWh/m²/day, and the cloudiest was 1986 at 4.2.
Average wind speed in Hagatna during December is 6.6 m/s. The windiest December was 1992 at 7.6 m/s, while the calmest was 2010 at 4.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.6°C | 27.6°C | 28.0°C | 28.2°C | 28.5°C | +0.9°C |
| Avg High | 28.0°C | 27.9°C | 28.4°C | 28.6°C | 28.9°C | +0.9°C |
| Avg Low | 27.3°C | 27.2°C | 27.7°C | 27.9°C | 28.2°C | +0.9°C |
| Avg Rain | 103 mm | 81 mm | 82 mm | 58 mm | 79 mm | -24 mm |
December temperatures in Hagatna have risen by about 1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 25.5°C (1992) to a record high of 29.9°C (2022).
Rainfall in December is one of the drier months, averaging 80 mm, with a wettest year of 206 mm.
A good time to visit Hagatna
December is a good time to visit Hagatna, with days averaging 28.3°C and nights around 27.6°C (mean 28°C, close to Hagatna's yearly average) and higher rainfall. March and February are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.8°C | 28.5°C | 28.1°C | 29.3°C | 27.2°C | 60 mm | 80% | 5.8 m/s | — |
| 2024 🔥 | 29.1°C | 28.8°C | 28.4°C | 29.6°C | 27.9°C | 66 mm | 80% | 6.2 m/s | 4.8 |
| 2023 | 29.0°C | 28.6°C | 28.2°C | 29.3°C | 27.6°C | 53 mm | 79% | 7 m/s | 5 |
| 2022 | 28.9°C | 28.6°C | 28.3°C | 29.9°C | 27.4°C | 180 mm | 80% | 6.1 m/s | 4.6 |
| 2021 | 28.7°C | 28.3°C | 27.9°C | 29.3°C | 27.1°C | 56 mm | 79% | 5.9 m/s | 4.9 |
| 2020 | 28.7°C | 28.4°C | 28.0°C | 29.3°C | 27.0°C | 61 mm | 78% | 6.7 m/s | 5 |
| 2019 | 28.4°C | 28.0°C | 27.7°C | 28.9°C | 26.9°C | 47 mm | 76% | 6.8 m/s | 5.1 |
| 2018 | 28.6°C | 28.3°C | 28.0°C | 29.1°C | 27.2°C | 111 mm | 81% | 7.1 m/s | 4.6 |
| 2017 | 29.0°C | 28.6°C | 28.3°C | 29.5°C | 27.1°C | 66 mm | 80% | 6 m/s | 4.8 |
| 2016 | 28.7°C | 28.3°C | 28.0°C | 29.3°C | 27.3°C | 68 mm | 79% | 7 m/s | 4.8 |
| 2015 | 28.1°C | 27.8°C | 27.5°C | 28.8°C | 26.6°C | 44 mm | 80% | 6.5 m/s | 5 |
| 2014 | 28.9°C | 28.5°C | 28.1°C | 29.3°C | 27.3°C | 57 mm | 79% | 6.5 m/s | 4.9 |
| 2013 | 28.6°C | 28.2°C | 27.8°C | 29.3°C | 27.0°C | 45 mm | 78% | 6 m/s | 4.7 |
| 2012 | 28.8°C | 28.4°C | 27.9°C | 29.2°C | 27.2°C | 64 mm | 78% | 6.8 m/s | 5 |
| 2011 | 28.5°C | 28.1°C | 27.8°C | 29.0°C | 27.4°C | 46 mm | 80% | 7.1 m/s | 4.7 |
| 2010 | 28.4°C | 28.1°C | 27.7°C | 29.3°C | 27.0°C | 29 mm | 79% | 4.9 m/s | 5.2 |
| 2009 | 28.1°C | 27.8°C | 27.4°C | 28.9°C | 26.6°C | 146 mm | 81% | 5.4 m/s | 4.5 |
| 2008 | 28.6°C | 28.2°C | 27.8°C | 29.1°C | 27.0°C | 42 mm | 78% | 6.4 m/s | 5 |
| 2007 | 28.7°C | 28.3°C | 27.9°C | 29.3°C | 27.1°C | 35 mm | 77% | 6.8 m/s | 5 |
| 2006 | 28.2°C | 27.9°C | 27.6°C | 28.8°C | 26.6°C | 62 mm | 81% | 6.9 m/s | 4.7 |
| 2005 | 28.7°C | 28.3°C | 28.0°C | 29.3°C | 27.1°C | 49 mm | 78% | 6.2 m/s | 5 |
| 2004 | 28.3°C | 28.0°C | 27.6°C | 29.3°C | 27.0°C | 84 mm | 79% | 6.5 m/s | 4.7 |
| 2003 | 28.5°C | 28.1°C | 27.8°C | 29.6°C | 26.5°C | 86 mm | 80% | 5.8 m/s | 4.6 |
| 2002 | 28.1°C | 27.7°C | 27.3°C | 28.7°C | 26.2°C | 155 mm | 80% | 6.8 m/s | 4.7 |
| 2001 | 28.1°C | 27.8°C | 27.4°C | 29.2°C | 26.6°C | 86 mm | 78% | 7.1 m/s | 4.6 |
| 2000 | 28.5°C | 28.2°C | 27.9°C | 29.4°C | 26.8°C | 77 mm | 80% | 7 m/s | 4.7 |
| 1999 | 28.6°C | 28.2°C | 27.9°C | 29.5°C | 27.1°C | 42 mm | 73% | 7.1 m/s | 5 |
| 1998 | 28.5°C | 28.1°C | 27.8°C | 29.0°C | 26.4°C | 42 mm | 75% | 6.7 m/s | 4.9 |
| 1997 🌧️ | 27.9°C | 27.6°C | 27.3°C | 28.6°C | 26.1°C | 206 mm | 79% | 6.6 m/s | 4.8 |
| 1996 | 28.1°C | 27.8°C | 27.5°C | 29.2°C | 26.4°C | 129 mm | 81% | 7.2 m/s | 4.5 |
| 1995 | 28.6°C | 28.3°C | 28.0°C | 29.2°C | 27.5°C | 100 mm | 78% | 6 m/s | 4.5 |
| 1994 | 27.3°C | 27.0°C | 26.6°C | 28.1°C | 25.7°C | 75 mm | 80% | 7.3 m/s | 4.4 |
| 1993 | 27.8°C | 27.5°C | 27.2°C | 28.6°C | 26.4°C | 40 mm | 79% | 7.5 m/s | 4.7 |
| 1992 | 27.2°C | 26.9°C | 26.5°C | 28.4°C | 25.5°C | 21 mm | 74% | 7.6 m/s | 4.8 |
| 1991 | 27.2°C | 26.9°C | 26.5°C | 27.5°C | 26.0°C | 29 mm | 78% | 6.2 m/s | 4.9 |
| 1990 | 27.5°C | 27.2°C | 26.9°C | 28.4°C | 26.0°C | 130 mm | 81% | 7.3 m/s | 4.7 |
| 1989 | 28.0°C | 27.7°C | 27.4°C | 28.7°C | 26.2°C | 67 mm | 82% | 6.4 m/s | 4.7 |
| 1988 | 28.5°C | 28.1°C | 27.7°C | 29.0°C | 26.8°C | 27 mm | 80% | 6.3 m/s | 4.9 |
| 1987 | 28.2°C | 27.8°C | 27.5°C | 28.8°C | 26.8°C | 68 mm | 80% | 6.9 m/s | 4.7 |
| 1986 | 27.7°C | 27.3°C | 26.9°C | 28.6°C | 26.2°C | 162 mm | 82% | 7 m/s | 4.2 |
| 1985 | 28.0°C | 27.6°C | 27.3°C | 28.7°C | 26.6°C | 106 mm | 81% | 6.5 m/s | 4.5 |
| 1984 | 28.0°C | 27.7°C | 27.3°C | 28.6°C | 26.2°C | 85 mm | 80% | 6.5 m/s | 4.7 |
| 1983 | 28.2°C | 27.8°C | 27.4°C | 28.8°C | 26.6°C | 113 mm | 81% | 5.5 m/s | — |
| 1982 ❄️ | 27.3°C | 26.9°C | 26.6°C | 28.3°C | 25.6°C | 130 mm | 80% | 6.8 m/s | — |
| 1981 | 28.3°C | 27.9°C | 27.6°C | 28.9°C | 26.7°C | 174 mm | 82% | 6.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 28.3°C with lows near 27.6°C (mean 28°C), based on 45 years of NASA POWER data.
December averages 80 mm of rainfall in Hagatna, one of the drier months. The wettest on record was 206 mm in 1997.
The hottest December reached 29.9°C in 2022. The coldest dipped to 25.5°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1°C. Daytime highs moved from 28°C to 28.9°C and overnight lows from 27.2°C to 28.2°C over the same span.
December is close to Hagatna's year-round average and one of the drier months, so plan for around 28.3°C daytime highs and 27.6°C at night.
Not quite — December is the 5th coolest month in Hagatna, averaging 28°C.
For December in Hagatna, pack light layers you can adjust through the day, with typical highs of 28.3°C and lows of 27.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 79% — quite humid.
Average wind speed in December is 6.6 m/s. The windiest December on record averaged 7.6 m/s (1992).
The wettest December on record was 1997 with 206 mm. On average, December sees 80 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 Hagatna 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.
