Irosin weather in December

In December, Irosin sees average daytime highs of 28°C and overnight lows near 25°C, with 248 mm of rain across 23.5 wet days and about 11.3 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 13% of the time in December, and the air most often feels miserable.

Daylight stretches from about 11 h 18 min at the start of December to 11 h 18 min by month's end. Set against the rest of the year, December is Irosin's 7th-clearest and 2nd-windiest month. For the whole year in context, see Irosin's year-round climate.

Daytime high
28°
10th warmest
Overnight low
25°
4th coldest
Rainfall
248 mm
23.5 wet days
Daylight
11 h 18 min
6:02 AM – 5:18 PM
Cloud cover
75%
7th clearest
Wind
18 km/h
2nd windiest
Solar energy
4.02 kWh/m²
Travel score
4.0
out of 10

Irosin is municipality of the Philippines in the province of Sorsogon.

Density
138/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical December day in Irosin reaches about 28°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92825
102825
112825
122825
132825
142825
152825
162825
172825
182825
192825
202825
212825
222825
232825
242825
252825
262825
272824
282824
292824
302824
312824

How December really feels in Irosin

Once humidity and wind are folded in, December averages 24 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
24
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Irosin weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 24°17220.411.34.8
Feb28° / 24°10715.711.65.0
Mar29° / 24°9015.611.94.9
Apr30° / 25°5912.212.34.7
May31° / 26°12818.812.63.6
Jun31° / 26°19124.412.72.9
Jul30° / 25°28427.612.72.8
Aug30° / 26°22225.212.43.1
Sep30° / 25°2482612.12.9
Oct30° / 25°21826.311.73.1
Nov29° / 25°18824.211.43.5
Dec28° / 25°24823.511.34.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 71%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13070
23070
33070
42971
52971
62971
73070
83070
93070
102971
112971
123070
132971
142971
153070
162971
172971
182971
192872
202773
212872
222872
232773
242773
252872
262872
272971
282971
292872
302971
313070

Chance of precipitation in December

Any precipitation

Irosin gets around 248 mm of rain over 23.5 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 75% and peaks near 78% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
178
278
378
478
578
678
778
878
978
1078
1178
1278
1378
1478
1577
1677
1776
1876
1976
2075
2175
2274
2373
2473
2572
2672
2771
2871
2970
3070
3170

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the miserable band about 64% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
112475
212574
312574
412574
512673
612673
712673
812673
912772
1012772
1112871
1212970
1312970
1413069
1513168
1623266
1723365
1823464
1933463
2033562
2143660
2243660
2353758
2453857
2563955
2663955
2774053
2874152
2984249
3084448
3184546

Wind in December

Winds average 18 km/h in December.

Across December, daily wind ranges from about 16 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
116light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light breeze
3119light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 18 min at the start of December to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:54 AM to 6:09 AM, and sunset from 5:13 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.35:545:13
211.35:555:13
311.35:555:13
411.35:565:14
511.35:575:14
611.35:575:14
711.35:585:14
811.35:585:15
911.35:595:15
1011.35:595:15
1111.36:005:16
1211.36:005:16
1311.36:015:17
1411.36:015:17
1511.36:025:17
1611.36:025:18
1711.36:035:18
1811.36:035:19
1911.36:045:19
2011.36:045:19
2111.36:055:20
2211.36:055:20
2311.36:065:21
2411.36:065:21
2511.36:075:22
2611.36:075:22
2711.36:085:23
2811.36:085:23
2911.36:085:24
3011.36:095:24
3111.36:095:25

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.02 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.02 kWh/m² to a high of 6.33 kWh/m² in April across the year — December's 4.02 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.0Bright
144.0Bright
154.0Bright
164.0Bright
174.0Bright
184.0Bright
194.0Bright
204.0Bright
214.0Bright
224.0Bright
234.0Bright
244.0Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
314.1Bright
Planning a trip in December

Hazard calendar for Irosin

In seasonPeak

In December, Irosin sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Irosin sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Irosin?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.0
Sightseeing
5th-best month of the year
4.7
Beach & pool
6th-best month of the year

December is a reasonable time to visit Irosin for sightseeing.

What to pack for Irosin in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Irosin sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

Sea temperature near Irosin in December

The nearest coast averages about 27°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in June at about 29°C and coldest in February near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb26Warm
Mar27Warm
Apr28Warm
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Irosin in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Irosin peaks around April 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highApr 16UV 14Dec 15UV 9
UV index (midday)Level
Jan10Extreme
Feb12Extreme
Mar13Extreme
Apr14Extreme
May13Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Irosin in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Irosin is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (April, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodJul 1720 µg/m³Apr 169 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar11Good
Apr9Good
May11Good
Jun16Moderate
Jul20Moderate
Aug17Moderate
Sep18Moderate
Oct17Moderate
Nov12Good
Dec12Good
Location & terrain

Where is Irosin?

Irosin sits at 12.7°N, 124.0°E, 33 m above sea level, in Philippines. The nearest listed city is Bulan, 17 km away.

Topography around Irosin

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Irosin.

Within 3 km, the terrain around Irosin has significant variations in elevation — a maximum elevation change of 390 m around an average of 99 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,544 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,412 m.

The land around Irosin is covered by trees (69%) and cropland (27%) within 3 km, trees (77%) within 16 km, and water (63%) and trees (33%) within 80 km.

3 km
390 m
16 km
1,544 m
80 km
2,412 m
treesgrasslandcroplandartificial surfaceswatermangroves
December weather nearby: Bulan 17 km · Gubat 26 km · Sorsogon 31 km · Donsol 53 km · Masbate 57 km · Legaspi 58 km · Tagas 62 km · Catarman 69 km

Philippines travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 60 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$4,171
2025
Happiness
6.2 / 10
World Happiness, 2025
Safe drinking water
48%
of population, 2024
Homicide rate
4.3
per 100k, 2023
Road deaths
12
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
High
EF EPI 569
Religion
Roman Catholic 79%other 8%Muslim 6%other Christian 4%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Irosin (12.7001°, 124.0322°, elevation 33 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).