Climate averages 1991–2020
Sylhet weather
in December.
A warm, very dry month: the 11th warmest and the 2nd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Sylhet: daytime highs average 24.7°C and nights cool to about 13.3°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 12 mm of rain on roughly 1 day, which makes December a very dry month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 37 min on an average December day.
The nearest other city in this atlas is Sunāmganj (51 km away). In December its highs average 24.0°C, 0.7°C cooler than Sylhet, with 11 mm of rain.
Among the 63 cities listed in Bangladesh, Sylhet ranks joint 56th of 63 for the warmest December highs and joint 51st of 63 for the driest December (rainfall, lowest first). The mean December high of those 63 cities is 25.1°C; Sylhet is 0.4°C cooler than that mean.
From December to January, average highs fall by 1.2°C to 23.5°C, and monthly rainfall falls from 12 mm to 10 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
Sylhet climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 23.5°C11.6°C | 11.6°C | 10 | 1.8 | 10.811 h |
| February | 25.8°C13.7°C | 13.7°C | 48 | 4.7 | 11.311 h |
| March | 28.6°C17.4°C | 17.4°C | 186 | 11.2 | 12.012 h |
| April | 29.4°C20.9°C | 20.9°C | 559 | 21.4 | 12.713 h |
| May | 29.8°C23.1°C | 23.1°C | 759 | 27.6 | 13.313 h |
| June | 30.0°C24.7°C | 24.7°C | 953 | 29.5 | 13.714 h |
| July | 30.1°C25.0°C | 25.0°C | 940 | 30.8 | 13.514 h |
| August | 30.4°C25.1°C | 25.1°C | 733 | 30.7 | 13.013 h |
| September | 30.1°C24.5°C | 24.5°C | 523 | 27.6 | 12.312 h |
| October | 29.3°C22.1°C | 22.1°C | 217 | 14.8 | 11.612 h |
| November | 27.3°C17.3°C | 17.3°C | 28 | 2.3 | 11.011 h |
| December, selected | 24.7°C13.3°C | 13.3°C | 12 | 1.0 | 10.611 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
- Sunāmganj in DecemberBangladesh · 51 kmHigh 24.0°C · Low 12.3°C · 11 mm rain
- Habiganj in DecemberBangladesh · 74 kmHigh 25.3°C · Low 14.3°C · 13 mm rain
- Shillong in DecemberIndia · 74 kmHigh 16.9°C · Low 8.5°C · 16 mm rain
- Silchar in DecemberIndia · 94 kmHigh 24.8°C · Low 13.4°C · 14 mm rain
- Netrakona in DecemberBangladesh · 115 kmHigh 25.1°C · Low 13.6°C · 8.9 mm rain
- Kishorganj in DecemberBangladesh · 121 kmHigh 25.3°C · Low 14.2°C · 11 mm rain
- Brāhmanbāria in DecemberBangladesh · 128 kmHigh 25.3°C · Low 14.4°C · 13 mm rain
- Ashuganj City in DecemberBangladesh · 129 kmHigh 25.2°C · Low 14.5°C · 13 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 Sylhet) is explained once on the Sylhet year overview and on the Sources, method and limits page.