Climate averages 1991–2020
Bukit Mertajam weather
in December.
A hot, very wet month: the 10th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Bukit Mertajam: daytime highs average 28.9°C and nights cool to about 23.1°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 261 mm of rain on roughly 24 days, which makes December a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 49 min on an average December day.
The nearest other city in this atlas is Kulim (11 km away). In December its highs average 28.8°C, about as warm as Bukit Mertajam, with 261 mm of rain.
Among the 72 cities listed in Malaysia, Bukit Mertajam ranks joint 16th of 72 for the warmest December highs and joint 25th of 72 for the driest December (rainfall, lowest first). The mean December high of those 72 cities is 28.5°C; Bukit Mertajam is 0.4°C warmer than that mean.
From December to January, average highs rise by 0.7°C to 29.6°C, and monthly rainfall falls from 261 mm to 163 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
Bukit Mertajam climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.0°C | 23.0°C | 163 | 20.3 | 11.812 h |
| February | 30.5°C23.3°C | 23.3°C | 133 | 17.7 | 11.912 h |
| March | 30.7°C24.0°C | 24.0°C | 198 | 24.0 | 12.112 h |
| April | 30.2°C24.3°C | 24.3°C | 238 | 27.8 | 12.212 h |
| May | 30.1°C24.5°C | 24.5°C | 221 | 26.1 | 12.412 h |
| June | 30.1°C24.3°C | 24.3°C | 133 | 19.2 | 12.412 h |
| July | 30.0°C24.1°C | 24.1°C | 128 | 18.9 | 12.412 h |
| August | 30.0°C24.0°C | 24.0°C | 164 | 21.3 | 12.312 h |
| September | 29.4°C23.8°C | 23.8°C | 214 | 24.8 | 12.212 h |
| October | 28.8°C23.7°C | 23.7°C | 338 | 28.5 | 12.012 h |
| November | 28.8°C23.5°C | 23.5°C | 370 | 27.9 | 11.912 h |
| December, selected | 28.9°C23.1°C | 23.1°C | 261 | 23.8 | 11.812 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
- Kulim in DecemberMalaysia · 11 kmHigh 28.8°C · Low 22.6°C · 261 mm rain
- Butterworth in DecemberMalaysia · 12 kmHigh 29.1°C · Low 23.6°C · 167 mm rain
- Val Dor in DecemberMalaysia · 13 kmHigh 29.0°C · Low 23.2°C · 261 mm rain
- Tasek Glugor in DecemberMalaysia · 14 kmHigh 29.0°C · Low 23.2°C · 190 mm rain
- Paya Terubong in DecemberMalaysia · 21 kmHigh 27.9°C · Low 23.7°C · 214 mm rain
- Kampung Sungai Ara in DecemberMalaysia · 22 kmHigh 28.5°C · Low 24.3°C · 214 mm rain
- Kota Kuala Muda in DecemberMalaysia · 27 kmHigh 29.2°C · Low 23.8°C · 167 mm rain
- Sungai Petani in DecemberMalaysia · 32 kmHigh 29.1°C · Low 23.2°C · 161 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 Bukit Mertajam) is explained once on the Bukit Mertajam year overview and on the Sources, method and limits page.
Kulim and Val Dor lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.