Climate averages 1991–2020
Portmore weather
in December.
A hot, fairly dry month: the 11th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Portmore: daytime highs average 28.4°C and nights cool to about 22.8°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 30 mm of rain on roughly 6 days, which makes December a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 04 min on an average December day.
The nearest other city in this atlas is Spanish Town (8 km away). In December its highs average 28.4°C, about as warm as Portmore, with 30 mm of rain.
Among the 4 cities listed in Jamaica, Portmore ranks joint 2nd of 4 for the warmest December highs and joint 1st of 4 for the driest December (rainfall, lowest first). The mean December high of those 4 cities is 28.6°C; Portmore is 0.2°C cooler than that mean.
From December to January, average highs fall by 0.2°C to 28.2°C, and monthly rainfall falls from 30 mm to 17 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
Portmore climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.2°C22.2°C | 22.2°C | 17 | 4.4 | 11.211 h |
| February | 28.5°C22.1°C | 22.1°C | 17 | 4.7 | 11.512 h |
| March | 29.0°C22.3°C | 22.3°C | 31 | 6.5 | 12.012 h |
| April | 29.8°C23.2°C | 23.2°C | 48 | 9.4 | 12.513 h |
| May | 30.0°C24.2°C | 24.2°C | 119 | 15.4 | 13.013 h |
| June | 30.5°C25.2°C | 25.2°C | 68 | 11.0 | 13.213 h |
| July | 31.5°C25.3°C | 25.3°C | 52 | 9.4 | 13.113 h |
| August | 31.4°C25.4°C | 25.4°C | 86 | 14.5 | 12.713 h |
| September | 30.7°C25.0°C | 25.0°C | 139 | 18.8 | 12.312 h |
| October | 29.6°C24.4°C | 24.4°C | 140 | 21.3 | 11.712 h |
| November | 28.9°C23.7°C | 23.7°C | 67 | 11.6 | 11.311 h |
| December, selected | 28.4°C22.8°C | 22.8°C | 30 | 6.2 | 11.111 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
- Spanish Town in DecemberJamaica · 8 kmHigh 28.4°C · Low 22.8°C · 30 mm rain
- Kingston in DecemberJamaica · 10 kmHigh 28.4°C · Low 22.0°C · 41 mm rain
- Montego Bay in DecemberJamaica · 122 kmHigh 29.0°C · Low 22.9°C · 50 mm rain
- Santiago de Cuba in DecemberCuba · 254 kmHigh 29.1°C · Low 22.1°C · 22 mm rain
- Manzanillo, Cuba in DecemberCuba · 265 kmHigh 29.9°C · Low 21.1°C · 23 mm rain
- Palma Soriano in DecemberCuba · 266 kmHigh 28.7°C · Low 20.1°C · 23 mm rain
- Contramaestre in DecemberCuba · 267 kmHigh 29.0°C · Low 20.2°C · 27 mm rain
- Bayamo in DecemberCuba · 268 kmHigh 29.2°C · Low 19.8°C · 28 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 Portmore) is explained once on the Portmore year overview and on the Sources, method and limits page.
Spanish Town lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.