Koolauloa climate — normals and trends
Koolauloa (United States) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 23.2 °C and it receives 515 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (25.1 °C on average) and the coldest is February (21.3 °C). Rainfall peaks in January.
Koolauloa averages 0 frost days, 3 hot days (≥ 30 °C) and 119 rainy days per year.
Koolauloa has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 31.8 °C (on 28 August 2019) and the coldest 14.4 °C (on 20 January 1969).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
KoolauloaHawaii
- coords
- 21.61°, -157.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.2°C
Average daily high
26.1°C
Average daily low
21.2°C
Annual rainfall
515mm
Sunshine / day
11.4h
Mean relative humidity
75%
Average peak wind
22.1km/h
Seasonal range
3.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
0.0 cm
Average feels-like high
27.5 °C
Average feels-like low
22.0 °C
Average peak gust
45.6 km/h
Tropical nights (≥ 20 °C)
279 d/yr
Solar radiation
21.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.53 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
31.8 °C
28 August 2019
Coldest day
14.4 °C
20 January 1969
Wettest day
232 mm
18 November 1990
Windiest day
66.8 km/h
23 November 1982
Strongest gust
133.2 km/h
23 November 1982
Hottest feels-like
37.7 °C
22 August 2015
Coldest feels-like
10.3 °C
20 February 1962
Sunniest day
13.0 h
9 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 25.5 °C | +1.4 °C | 55 mm | -17 mm |
| Feb | 25.8 °C | +1.8 °C | 21 mm | -31 mm |
| Mar | 26.4 °C | +2.1 °C | 28 mm | -33 mm |
| Apr | 26.7 °C | +1.7 °C | 54 mm | +16 mm |
| May | 27.6 °C | +1.5 °C | 26 mm | -6 mm |
| Jun | 28.3 °C | +1.1 °C | 21 mm | -3 mm |
| Jul | 28.8 °C | +1.2 °C | 16 mm | -10 mm |
| Aug | 29.2 °C | +1.1 °C | 17 mm | -9 mm |
| Sep | 29.2 °C | +1.0 °C | 18 mm | -8 mm |
| Oct | 28.6 °C | +1.2 °C | 22 mm | -18 mm |
| Nov | 27.4 °C | +1.4 °C | 21 mm | -36 mm |
| Dec | 26.2 °C | +1.5 °C | 81 mm | +20 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Koolauloa?
Koolauloa has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 23.2 °C and it receives 515 mm of precipitation per year.
What is the hottest day ever recorded in Koolauloa?
The hottest day measured in Koolauloa between 1940 and 2025 was 28 August 2019, reaching 31.8 °C.
What is the coldest day in Koolauloa?
The coldest day measured in Koolauloa between 1940 and 2025 was 20 January 1969, at 14.4 °C.
Does it snow in Koolauloa?
Almost never: Koolauloa sees virtually no snow, with about 0 frost days per year.
Has the climate of Koolauloa warmed?
Yes: Koolauloa warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Koolauloa?
The wettest day measured in Koolauloa between 1940 and 2025 was 18 November 1990, with 232 mm of rain in 24 hours.
What was the windiest day in Koolauloa?
The windiest day measured in Koolauloa between 1940 and 2025 was 23 November 1982, with winds reaching 66.8 km/h.
What is the warmest month in Koolauloa?
The warmest month in Koolauloa is August (25.1 °C on average); the coldest is February (21.3 °C).
How much does it rain in Koolauloa?
Koolauloa receives on average 515 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Koolauloa?
Koolauloa gets on average 11.4 hours of sunshine per day, roughly 4,161 hours per year over 1940-2025.
Are there tropical nights in Koolauloa?
Yes: Koolauloa has on average 279 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Koolauloa?
In Koolauloa, between 1940 and 2025, the highest apparent temperature reached 37.7 °C on 22 August 2015, and the lowest was 10.3 °C on 20 February 1962.
Compare Koolauloa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Koolauloa