Climate guideThirty-year normals for Sison, Ilocos
Sison climate by month
Tropical monsoon · AmBest Jan–Mar
Annual mean26°day and night
Seasonal swing3°warmest vs coolest
Precipitation3,230 mm241 wet days a year
16.17° N, 120.52° EElevation 93 mUTC+8 · Philippine Standard Time
When to goSison · weather score
Best timeJan–Mar
October: high / low29° / 24°
iSummary
What the weather is like
Sison has a tropical monsoon climate (Köppen Am): .
The warmest month is April, when afternoons average 32° and nights 24°. January is the coolest month, with highs of 28° and lows of 22°. The difference between the warmest and the coolest month is about 3°, a small seasonal swing typical of places tempered by the sea.
About 3,230 mm of precipitation falls in an average year. July is the wettest month (660 mm, 30 wet days) and January the driest (18 mm, 7 wet days). Cloud cover ranges from 18% in March to 71% in August.
Compared with Manila, the capital, Sison is 0.9° cooler on a April afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 32° · April
- Coldest nights
- 22° · January
- Wettest month
- July
- Driest month
- January
- Clearest skies
- March · 18% cloud
- Longest day
- 13 h 05 min
- Shortest day
- 11 h 10 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 28° | 29° | 30° | 32° | 31° | 30° | 29° | 29° | 29° | 29° | 29° | 28° |
| Average low | 22° | 22° | 23° | 24° | 25° | 25° | 24° | 24° | 24° | 24° | 23° | 22° |
| Precipitation | 18 mm | 21 mm | 36 mm | 87 mm | 266 mm | 453 mm | 660 mm | 753 mm | 489 mm | 333 mm | 86 mm | 28 mm |
| Wet days (≥1 mm) | 6.8 | 8.2 | 9.3 | 13 | 25.8 | 27.8 | 29.7 | 29.7 | 29.5 | 26 | 18.2 | 16.7 |
| Cloud cover | 22% | 20% | 18% | 21% | 48% | 59% | 65% | 71% | 63% | 50% | 37% | 27% |
| Daylight | 11h 16 | 11h 37 | 12h 02 | 12h 30 | 12h 53 | 13h 05 | 13h 00 | 12h 41 | 12h 14 | 11h 48 | 11h 23 | 11h 10 |
| Month score | 71 | 64 | 55 | 42 | 34 | 34 | 36 | 35 | 38 | 42 | 46 | 53 |
ivMonth by month
Sison in every month
January71
28° / 22°
18 mm · 6.8 wet days
February64
29° / 22°
21 mm · 8.2 wet days
March55
30° / 23°
36 mm · 9.3 wet days
April42
32° / 24°
87 mm · 13 wet days
May34
31° / 25°
266 mm · 25.8 wet days
June34
30° / 25°
453 mm · 27.8 wet days
July36
29° / 24°
660 mm · 29.7 wet days
August35
29° / 24°
753 mm · 29.7 wet days
September38
29° / 24°
489 mm · 29.5 wet days
October42
29° / 24°
333 mm · 26 wet days
November46
29° / 23°
86 mm · 18.2 wet days
December53
28° / 22°
28 mm · 16.7 wet days