Sea Mountain 12.15, Hawaii climate: Climate normals at a NOAA weather station
Sea Mountain 12.15's normal year runs from 65°F January nights to 85°F August afternoons, with 35.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 23.9°C, January lows of 18°C, August highs of 29°C, 895 mm of precipitation a year.
- NOAA stationSea Mountain 12.15
- Station IDUSC00518600
- Location19.13°N 155.51°W
- Elevation80 ft (24 m)
On October 14, the normal high in Sea Mountain 12.15 is 84°F and the normal low 70°F, and the chance of measurable rain or snow is 32%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Sea Mountain 12.15.
- Jan 79° 65°
- Feb 80° 65°
- Mar 80° 66°
- Apr 80° 67°
- May 82° 68°
- Jun 83° 70°
- Jul 84° 70°
- Aug 85° 71°
- Sep 84° 70°
- Oct 84° 70°
- Nov 82° 69°
- Dec 81° 67°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Sea Mountain 12.15 each month?
August is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 65°F. The most precipitation falls in October (4.14 in), the least in June (0.80 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 79°F | 65°F | 72.2°F | 3.52 | 8 | <1 | <1 | 11 h 10 min |
| February | 80°F | 65°F | 72.4°F | 3.94 | 8 | <1 | <1 | 11 h 30 min |
| March | 80°F | 66°F | 72.7°F | 4.03 | 9 | <1 | <1 | 12 h |
| April | 80°F | 67°F | 73.8°F | 1.89 | 8 | <1 | <1 | 12 h 30 min |
| May | 82°F | 68°F | 74.9°F | 1.41 | 7 | <1 | <1 | 13 h |
| June | 83°F | 70°F | 76.1°F | 0.80 | 6 | <1 | <1 | 13 h 20 min |
| July | 84°F | 70°F | 77.0°F | 1.87 | 6 | <1 | <1 | 13 h 10 min |
| August | 85°F | 71°F | 77.6°F | 2.89 | 5 | <1 | <1 | 12 h 50 min |
| September | 84°F | 70°F | 77.1°F | 2.77 | 7 | <1 | <1 | 12 h 20 min |
| October | 84°F | 70°F | 77.0°F | 4.14 | 9 | <1 | <1 | 11 h 40 min |
| November | 82°F | 69°F | 75.4°F | 3.96 | 9 | <1 | <1 | 11 h 10 min |
| December | 81°F | 67°F | 73.8°F | 4.00 | 8 | 1 | <1 | 11 h |
| Year (annual) | 82°F | 68°F | 75.0°F | 35.22 | 90 | 2 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 26°C | 18°C | 22.3°C | 89 mm |
| February | 27°C | 18°C | 22.4°C | 100 mm |
| March | 26°C | 19°C | 22.6°C | 102 mm |
| April | 27°C | 19°C | 23.2°C | 48 mm |
| May | 28°C | 20°C | 23.8°C | 36 mm |
| June | 28°C | 21°C | 24.5°C | 20 mm |
| July | 29°C | 21°C | 25.0°C | 47 mm |
| August | 29°C | 21°C | 25.3°C | 73 mm |
| September | 29°C | 21°C | 25.1°C | 70 mm |
| October | 29°C | 21°C | 25.0°C | 105 mm |
| November | 28°C | 20°C | 24.1°C | 101 mm |
| December | 27°C | 19°C | 23.2°C | 102 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00518600; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Sea Mountain 12.15?
Every month's normal high in Sea Mountain 12.15 falls between 65°F and 85°F.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00518600.
How hot and how cold does it get at Sea Mountain 12.15?
In a normal year in Sea Mountain 12.15, 2 days a year reach 90°F, nights almost never fall to freezing and 90 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00518600.
How sunny is it at Sea Mountain 12.15?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Sea Mountain 12.15, 5.3 kWh per square metre a day. January is the sunniest month (79%) and March the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 4.4 |
| February | 75% | 4.8 |
| March | 71% | 5.2 |
| April | 71% | 5.7 |
| May | 72% | 5.9 |
| June | 74% | 6.1 |
| July | 76% | 6.2 |
| August | 76% | 6.1 |
| September | 75% | 5.6 |
| October | 76% | 5.0 |
| November | 76% | 4.4 |
| December | 76% | 4.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Sea Mountain 12.15 record?
A normal year at Sea Mountain 12.15 brings 0 heating degree days, 100% fewer than the median U.S. place (5,373), and 3,652 cooling degree days, 4.0 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 9,127 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 0 | 223 |
| February | 0 | 207 |
| March | 0 | 239 |
| April | 0 | 263 |
| May | 0 | 307 |
| June | 0 | 333 |
| July | 0 | 371 |
| August | 0 | 389 |
| September | 0 | 365 |
| October | 0 | 372 |
| November | 0 | 312 |
| December | 0 | 273 |
| Year (annual) | 0 | 3,652 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00518600. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Sea Mountain 12.15's climate compare?
Sea Mountain 12.15 is warmer than 9 of the 18 places with their own NOAA record in Hawaii, and wetter than 9. Across the 7,247 U.S. stations with normals, its annual mean of 75.0°F is warmer than 99%.
In the Köppen classification computed from these normals, Sea Mountain 12.15 is Aw: tropical savanna. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Sea Mountain 12.15 share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Pahala, HI1,785 people · 5 mi NE
- Naalehu, HI837 people · 6 mi SW
- Waiohinu, HI159 people · 8 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Sea Mountain 12.15's climate
What is the coldest month at Sea Mountain 12.15?
January, with a normal high of 79°F and a normal low of 65°F. The warmest is August (85°F by day, 71°F at night).
Does it snow at Sea Mountain 12.15?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month at Sea Mountain 12.15?
October, with 4.14 in of precipitation in a normal year; the driest is June with 0.80 in.
What plant hardiness zone is Sea Mountain 12.15 in?
The USDA's 2023 map puts Sea Mountain 12.15 in zone 12b in ZIP code 96777, the nearest ZIP area.
Nearby and next
- Hawaii climateThe statewide normals and every place in the state
- South Kona 2 2.32, HI16 miles from this station, 67.2°F a year
- Opihihale #2 24.1, HI25 miles from this station, 68.1°F a year
- Hawaii Vol National Park Headquarters 54, HI26 miles from this station, 61.7°F a year
- Mauna Loa (5 mi NNE), HI28 miles from this station, 46.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made