Koolauloa weather in December

In December, Koolauloa sees average daytime highs of 77°F and overnight lows near 69°F, with 1.9 in of rain across 7.2 wet days and about 10.7 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 40% of the time in December, and the air most often feels humid.

Daylight stretches from about 10 h 48 min at the start of December to 10 h 42 min by month's end. Set against the rest of the year, December is Koolauloa's 3rd-clearest and 7th-windiest month. For the whole year in context, see Koolauloa's year-round climate.

Daytime high
77°
9th warmest
Overnight low
69°
5th coldest
Rainfall
1.9 in
7.2 wet days
Daylight
10 h 42 min
7:07 AM – 5:49 PM
Cloud cover
49%
3rd clearest
Wind
11 mph
7th windiest
Solar energy
4.24 kWh/m²
Travel score
7.4
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 77°F through the month.

A typical December day in Koolauloa reaches about 77°F in the afternoon and slips back to 69°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 80°F. Set against its neighbours, December runs about 2°F cooler than November and on par with January.

60°70°80°151015202531
Avg high (°F)Avg low (°F)
17870
27870
37870
47870
57870
67870
77870
87870
97870
107770
117769
127769
137769
147769
157769
167769
177769
187769
197769
207769
217769
227769
237769
247769
257769
267769
277768
287768
297668
307668
317668

Koolauloa weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan76° / 67°1.67.310.87.6
Feb76° / 67°1.5711.37.5
Mar76° / 68°2.18.911.87.2
Apr78° / 69°1.08.412.57.0
May80° / 70°1.18137.0
Jun82° / 72°0.97.313.36.9
Jul82° / 73°0.87.813.26.6
Aug83° / 74°0.96.812.76.3
Sep83° / 74°0.8712.16.3
Oct82° / 73°1.37.211.56.7
Nov79° / 71°1.87.7117.0
Dec77° / 69°1.97.210.77.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 29% of December, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36139
46238
56337
66535
76535
86733
96832
106931
117030
127129
137129
147228
157327
167327
177327
187327
197426
207327
217327
227228
237129
247129
257030
266931
277030
287030
297030
307030
317129

Chance of precipitation in December

Any precipitation

Koolauloa gets around 1.9 in of rain over 7.2 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 23% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
226
326
426
525
625
724
824
923
1022
1122
1222
1321
1421
1521
1621
1721
1821
1921
2022
2122
2222
2323
2423
2524
2624
2724
2825
2925
3025
3124

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
10840484
20840483
31841473
41842463
51842463
61843453
71943452
81944442
91944442
101944432
1121045431
1221045421
1321045421
1421045421
1521045421
1621046421
1721046421
1821047411
1921047401
2021048401
2121049391
2221050381
2321050371
2421051361
2521150361
2621151351
2721251341
2821351331
2921452311
3021552301
3131651291

Wind in December

Winds average 11 mph in December.

Across December, daily wind ranges from about 10 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
611light breeze
711light breeze
811light breeze
911light breeze
1011light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1511light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze
3110light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 48 min at the start of December to 10 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:58 AM to 7:14 AM, and sunset from 5:45 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.86:585:45
210.86:595:45
310.86:595:45
410.87:005:45
510.77:015:45
610.77:015:46
710.77:025:46
810.77:035:46
910.77:035:46
1010.77:045:47
1110.77:045:47
1210.77:055:47
1310.77:065:47
1410.77:065:48
1510.77:075:48
1610.77:075:49
1710.77:085:49
1810.77:085:49
1910.77:095:50
2010.77:095:50
2110.77:105:51
2210.77:105:51
2310.77:115:52
2410.77:115:52
2510.77:125:53
2610.77:125:53
2710.77:125:54
2810.77:135:54
2910.77:135:55
3010.77:145:55
3110.77:145:56

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.24 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.24 kWh/m² to a high of 7.21 kWh/m² in June across the year — December's 4.24 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
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.4Bright
314.4Bright
Planning a trip in December

Hazard calendar for Koolauloa

In seasonPeak

None of Koolauloa's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Koolauloa sits in the eastern Pacific hurricane zone; the season peaks August–September.

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

Is December a good time to visit Koolauloa?

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

7.4
Sightseeing
3rd-best month of the year
6.8
Beach & pool
8th-best month of the year

December is one of the better times to visit Koolauloa for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Koolauloa in December

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

In December, Koolauloa sees daytime highs around 77°F and nights near 69°F. Worth packing: light clothes. About 7 days see rain.

light clothes

Sea temperature near Koolauloa in December

The nearest coast averages about 77°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in September at about 80°F and coldest in February near 75°F.

The water stays above 68°F all year — warm enough for a swim any month.

74°76°78°80°82°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan75Warm
Feb75Refreshing
Mar75Refreshing
Apr76Warm
May77Warm
Jun78Warm
Jul78Warm
Aug79Warm
Sep80Warm
Oct80Warm
Nov79Warm
Dec77Warm

UV index in Koolauloa in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Koolauloa peaks around July 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 23UV 12Dec 19UV 6
UV index (midday)Level
Jan6High
Feb9Very high
Mar10Extreme
Apr11Extreme
May10Very high
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct9Very high
Nov7High
Dec6High
Location & terrain

Where is Koolauloa?

Koolauloa sits at 21.6°N, 157.9°W, 640 ft above sea level, in United States. The nearest listed city is Wahiawā, 9.3 mi away.

Topography around Koolauloa

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Koolauloa.

Within 2 miles, the terrain around Koolauloa has large variations in elevation — a maximum elevation change of 2,434 ft around an average of 722 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,828 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,983 ft.

The land around Koolauloa is covered by trees (79%) within 2 miles, trees (47%) and water (44%) within 10 miles, and water (87%) within 50 miles.

2 miles
2,434 ft
10 miles
2,828 ft
50 miles
3,983 ft
treesshrubsgrasslandartificial surfaceswaterwetland
December weather nearby: Wahiawā 9.3 mi · Mililani Mauka / Launani Valley 9.3 mi · Wahiawā-Whitmore 9.9 mi · Mililani Mauka 9.9 mi · Schofield-Wheeler 11 mi · Schofield Barracks 12 mi · Mililani Town 12 mi · Waiau-Pacific Palisades 14 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Koolauloa (21.6058°, -157.9265°, elevation 640 ft), 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).