Climate averages 1991–2020
Jaffna weather
in December.
A warm, very wet month: one of the coolest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Jaffna: daytime highs average 26.8°C and nights cool to about 24.7°C. By daytime temperature it is one of the coolest months of the year.
Expect about 199 mm of rain on roughly 16 days, which makes December a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 34 min on an average December day.
The nearest other city in this atlas is Point Pedro (30 km away). In December its highs average 27.0°C, about as warm as Jaffna, with 191 mm of rain.
Among the 12 cities listed in Sri Lanka, Jaffna ranks 11th of 12 for the warmest December highs and joint 7th of 12 for the driest December (rainfall, lowest first). The mean December high of those 12 cities is 27.8°C; Jaffna is 1.0°C cooler than that mean.
From December to January, average highs stay level at 26.8°C, and monthly rainfall falls from 199 mm to 62 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
Jaffna climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.8°C24.4°C | 24.4°C | 62 | 6.7 | 11.612 h |
| February | 28.1°C24.8°C | 24.8°C | 26 | 4.3 | 11.812 h |
| March | 30.2°C25.9°C | 25.9°C | 22 | 3.3 | 12.112 h |
| April | 31.4°C27.3°C | 27.3°C | 45 | 7.5 | 12.312 h |
| May | 31.2°C28.1°C | 28.1°C | 58 | 7.6 | 12.613 h |
| June | 30.7°C27.9°C | 27.9°C | 27 | 5.6 | 12.713 h |
| July | 30.5°C27.5°C | 27.5°C | 33 | 9.0 | 12.613 h |
| August | 30.3°C27.1°C | 27.1°C | 48 | 10.4 | 12.412 h |
| September | 30.1°C26.9°C | 26.9°C | 67 | 12.1 | 12.212 h |
| October | 29.0°C26.0°C | 26.0°C | 208 | 20.9 | 11.912 h |
| November | 27.6°C25.1°C | 25.1°C | 313 | 22.1 | 11.712 h |
| December, selected | 26.8°C24.7°C | 24.7°C | 199 | 16.3 | 11.612 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
- Point Pedro in DecemberSri Lanka · 30 kmHigh 27.0°C · Low 24.5°C · 191 mm rain
- Pattukkottai in DecemberIndia · 113 kmHigh 28.2°C · Low 21.8°C · 118 mm rain
- Nagapattinam in DecemberIndia · 123 kmHigh 26.8°C · Low 24.2°C · 201 mm rain
- Kāraikāl in DecemberIndia · 140 kmHigh 26.8°C · Low 24.2°C · 194 mm rain
- Kāraikkudi in DecemberIndia · 143 kmHigh 28.3°C · Low 21.4°C · 104 mm rain
- Pudukkottai in DecemberIndia · 152 kmHigh 28.3°C · Low 21.3°C · 93 mm rain
- Paramagudi in DecemberIndia · 156 kmHigh 28.5°C · Low 22.0°C · 103 mm rain
- Thanjavur in DecemberIndia · 156 kmHigh 28.1°C · Low 21.4°C · 109 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 Jaffna) is explained once on the Jaffna year overview and on the Sources, method and limits page.