Hilo weather in December: Hilo, Hawaii: normal highs, lows, rain and records for December
Hilo in December has a normal high of 79°F and a normal low of 66°F, a daily mean of 72°F, holding near 79°F all month. Measurable precipitation falls on 22 days in a normal December, 12.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 19°C, 307 mm of precipitation in December.
- NOAA stationHilo International Airport 87
- Station IDUSW00021504
- Location19.72°N 155.05°W
- Elevation38 ft (12 m)
- Population (census place)48,223
- Jan 79° 64°
- Feb 78° 64°
- Mar 79° 65°
- Apr 79° 66°
- May 81° 67°
- Jun 82° 69°
- Jul 83° 70°
- Aug 83° 70°
- Sep 83° 70°
- Oct 82° 69°
- Nov 80° 68°
- Dec 79° 66°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hilo in December?
The normal high is 79°F and the normal low 66°F, for a daily mean of 72.2°F. December is 1.8°F cooler than November and 0.8°F warmer than January. December is the 9th warmest month of the year in Hilo and the 3rd wettest. From one year to the next December's mean temperature typically moves about 0.8°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 71°F and 73°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 76%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 79°F | 67°F | 76% | 56% |
| December 8 | 79°F | 66°F | 74% | 54% |
| December 15 | 79°F | 66°F | 71% | 51% |
| December 22 | 79°F | 65°F | 67% | 47% |
| December 31 | 79°F | 65°F | 60% | 40% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 79°F | 67°F | 76% | 56% | 11 h |
| December 2 | 79°F | 67°F | 76% | 56% | 11 h |
| December 3 | 79°F | 67°F | 76% | 56% | 11 h |
| December 4 | 79°F | 67°F | 75% | 56% | 11 h |
| December 5 | 79°F | 66°F | 75% | 55% | 11 h |
| December 6 | 79°F | 66°F | 75% | 55% | 11 h |
| December 7 | 79°F | 66°F | 74% | 55% | 11 h |
| December 8 | 79°F | 66°F | 74% | 54% | 11 h |
| December 9 | 79°F | 66°F | 74% | 54% | 11 h |
| December 10 | 79°F | 66°F | 73% | 54% | 11 h |
| December 11 | 79°F | 66°F | 73% | 53% | 11 h |
| December 12 | 79°F | 66°F | 73% | 53% | 11 h |
| December 13 | 79°F | 66°F | 72% | 52% | 11 h |
| December 14 | 79°F | 66°F | 72% | 52% | 11 h |
| December 15 | 79°F | 66°F | 71% | 51% | 11 h |
| December 16 | 79°F | 66°F | 71% | 51% | 11 h |
| December 17 | 79°F | 66°F | 70% | 50% | 11 h |
| December 18 | 79°F | 66°F | 69% | 49% | 11 h |
| December 19 | 79°F | 66°F | 69% | 49% | 11 h |
| December 20 | 79°F | 65°F | 68% | 48% | 11 h |
| December 21 | 79°F | 65°F | 67% | 47% | 11 h |
| December 22 | 79°F | 65°F | 67% | 47% | 11 h |
| December 23 | 79°F | 65°F | 66% | 46% | 11 h |
| December 24 | 79°F | 65°F | 65% | 45% | 11 h |
| December 25 | 79°F | 65°F | 64% | 44% | 11 h |
| December 26 | 79°F | 65°F | 64% | 44% | 11 h |
| December 27 | 79°F | 65°F | 63% | 43% | 11 h |
| December 28 | 79°F | 65°F | 62% | 42% | 11 h |
| December 29 | 79°F | 65°F | 61% | 41% | 11 h |
| December 30 | 79°F | 65°F | 61% | 41% | 11 h |
| December 31 | 79°F | 65°F | 60% | 40% | 11 h |
- Normal high
- 79°FDecember average
- Normal low
- 66°FDecember average
- Precipitation
- 12.07 inmonth total
- Days with precipitation
- 220.01 inch or more
- Daylight
- 11 h to 11 hDecember 1 to December 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 18
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00021504; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hilo in December?
On a given December day the chance of 0.01 inch or more is 69% on average, highest around December 1 (76%). In all, 12.07 in falls on 22 days of a normal December, 3 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00021504.
How humid and windy is Hilo in December?
At 3 p.m. the normal temperature is 77°F with 67% relative humidity and a dew point of 65°F; at 6 a.m. it is 66°F with 81% humidity. The wind averages 6.4 mph, most often from the east-northeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 66°F | 60°F | 81% | 6.1 mph | 38% |
| 9 a.m. | 72°F | 63°F | 73% | 5.2 mph | 40% |
| noon | 78°F | 65°F | 66% | 8.4 mph | 37% |
| 3 p.m. | 77°F | 65°F | 67% | 9.4 mph | 35% |
| 6 p.m. | 73°F | 65°F | 76% | 5.3 mph | 34% |
| 9 p.m. | 70°F | 65°F | 83% | 5.1 mph | 32% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00021504. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Hilo?
The warmest December temperature on Hilo's official record (since 1949) is 93°F, on December 14, 1980; the coldest is 55°F, on December 23, 1977. The wettest December brought 50.82 in (1954).
The December mean against the 1991-2020 normal of 72.2°F: 2021 73.0°F (+0.8), 2022 73.3°F (+1.1), 2023 72.6°F (+0.4), 2024 73.9°F (+1.7), 2025 73.3°F (+1.1). 5 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.0°F | +0.8°F | 24.99 in |
| 2022 | 73.3°F | +1.1°F | 7.48 in |
| 2023 | 72.6°F | +0.4°F | 7.62 in |
| 2024 | 73.9°F | +1.7°F | 2.90 in |
| 2025 | 73.3°F | +1.1°F | 3.84 in |
Source: records: ACIS, NWS threaded record ITOthr; recent months: ACIS, station USW00021504. Records and recent months use complete months only.
How does December in Hilo compare across Hawaii?
Across the 18 places PlainClimate covers in Hawaii, December normal highs run from 70°F in Kula to 83°F in Kahului; Hilo's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.