Climate averages 1991–2020
Phnom Penh weather
in December.
A hot, fairly dry month: the 10th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Phnom Penh: daytime highs average 30.5°C and nights cool to about 22.7°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 27 mm of rain on roughly 5 days, which makes December a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 28 min on an average December day.
The nearest other city in this atlas is Dangkao (7 km away). In December its highs average 30.5°C, about as warm as Phnom Penh, with 27 mm of rain.
Among the 8 cities listed in Cambodia, Phnom Penh ranks joint 1st of 8 for the warmest December highs and joint 5th of 8 for the driest December (rainfall, lowest first). The mean December high of those 8 cities is 30.3°C; Phnom Penh is 0.2°C warmer than that mean.
From December to January, average highs rise by 1.2°C to 31.7°C, and monthly rainfall falls from 27 mm to 15 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
Phnom Penh climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.7°C22.6°C | 22.6°C | 15 | 3.0 | 11.512 h |
| February | 33.3°C23.6°C | 23.6°C | 8.1 | 1.7 | 11.812 h |
| March | 34.5°C25.1°C | 25.1°C | 36 | 6.1 | 12.112 h |
| April | 34.7°C25.9°C | 25.9°C | 81 | 14.6 | 12.412 h |
| May | 33.6°C25.9°C | 25.9°C | 154 | 22.7 | 12.713 h |
| June | 32.4°C25.4°C | 25.4°C | 154 | 24.3 | 12.813 h |
| July | 31.8°C25.0°C | 25.0°C | 154 | 25.5 | 12.713 h |
| August | 31.7°C24.9°C | 24.9°C | 178 | 25.9 | 12.513 h |
| September | 31.0°C24.5°C | 24.5°C | 245 | 27.1 | 12.212 h |
| October | 30.4°C24.1°C | 24.1°C | 244 | 24.7 | 11.912 h |
| November | 30.3°C23.5°C | 23.5°C | 78 | 11.1 | 11.612 h |
| December, selected | 30.5°C22.7°C | 22.7°C | 27 | 5.1 | 11.511 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
- Dangkao in DecemberCambodia · 7 kmHigh 30.5°C · Low 22.8°C · 27 mm rain
- Takeo in DecemberCambodia · 65 kmHigh 30.4°C · Low 22.7°C · 36 mm rain
- Kampong Chhnang in DecemberCambodia · 81 kmHigh 30.5°C · Low 22.4°C · 22 mm rain
- Tân Châu in DecemberVietnam · 92 kmHigh 30.4°C · Low 22.7°C · 48 mm rain
- Hồng Ngự in DecemberVietnam · 97 kmHigh 30.4°C · Low 22.6°C · 48 mm rain
- Châu Đốc in DecemberVietnam · 98 kmHigh 30.2°C · Low 22.6°C · 47 mm rain
- Tịnh Biên in DecemberVietnam · 107 kmHigh 30.2°C · Low 22.6°C · 54 mm rain
- Hòa Thành in DecemberVietnam · 136 kmHigh 31.0°C · Low 22.7°C · 43 mm rain
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 Phnom Penh) is explained once on the Phnom Penh year overview and on the Sources, method and limits page.
Dangkao lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.