Climate averages 1991–2020
Hagåtña weather
in December.
A warm, wet month: the joint 8th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Hagåtña: daytime highs average 27.9°C and nights cool to about 26.3°C. By daytime temperature it is the joint 8th warmest of the 12 months.
Expect about 93 mm of rain on roughly 17 days, which makes December a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 21 min on an average December day.
The nearest other city in this atlas is Saipan (221 km away). In December its highs average 26.9°C, 1.0°C cooler than Hagåtña, with 67 mm of rain.
From December to January, average highs fall by 0.6°C to 27.3°C, and monthly rainfall falls from 93 mm to 71 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hagåtña climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.3°C25.8°C | 25.8°C | 71 | 14.7 | 11.411 h |
| February | 27.1°C25.6°C | 25.6°C | 52 | 11.5 | 11.712 h |
| March | 27.4°C25.7°C | 25.7°C | 45 | 10.2 | 12.012 h |
| April | 27.9°C26.1°C | 26.1°C | 67 | 11.1 | 12.412 h |
| May | 28.4°C26.4°C | 26.4°C | 81 | 15.0 | 12.713 h |
| June | 28.6°C26.5°C | 26.5°C | 140 | 20.4 | 12.913 h |
| July | 28.4°C26.2°C | 26.2°C | 272 | 28.4 | 12.813 h |
| August | 28.3°C26.1°C | 26.1°C | 350 | 29.2 | 12.613 h |
| September | 28.3°C26.1°C | 26.1°C | 314 | 27.2 | 12.212 h |
| October | 28.3°C26.1°C | 26.1°C | 279 | 27.5 | 11.812 h |
| November | 28.3°C26.5°C | 26.5°C | 175 | 21.5 | 11.512 h |
| December, selected | 27.9°C26.3°C | 26.3°C | 93 | 16.8 | 11.311 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hagåtña) is explained once on the Hagåtña year overview and on the Sources, method and limits page.