Winter Weather in Aloha United States

Daily high temperatures increase by 6°F, from 47°F to 54°F, rarely falling below 36°F or exceeding 62°F. The lowest daily average high temperature is 45°F on December 29.

Daily low temperatures are around 37°F, rarely falling below 25°F or exceeding 47°F. The lowest daily average low temperature is 35°F on December 31.

For reference, on August 2, the hottest day of the year, temperatures in Aloha typically range from 56°F to 84°F, while on December 31, the coldest day of the year, they range from 35°F to 45°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Sequeira, Portugal (5,292 miles away) is the far-away foreign place with temperatures most similar to Aloha (view comparison).

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The winter in Aloha experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 73% throughout the season. The highest chance of overcast or mostly cloudy conditions is 76% on January 16.

The clearest day of the winter is February 20, with clear, mostly clear, or partly cloudy conditions 30% of the time.

For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Aloha, the chance of a wet day over the course of the winter is decreasing, starting the season at 56% and ending it at 50%.

For reference, the year's highest daily chance of a wet day is 58% on November 26, and its lowest chance is 4% on August 3.

Over the course of the winter in Aloha, the chance of a day with only rain decreases from 54% to 49%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Aloha is very rapidly decreasing, starting the season at 9.3 inches, when it rarely exceeds 14.6 inches or falls below 4.0 inches, and ending the season at 6.2 inches, when it rarely exceeds 10.7 inches or falls below 2.4 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the winter in Aloha is gradually decreasing, starting the season at 1.1 inches, when it rarely exceeds 3.6 inches or falls below -0.0 inches, and ending the season at 0.5 inches, when it rarely exceeds 1.8 inches or falls below -0.0 inches.

The highest average 31-day accumulation is 2.5 inches on January 6.

Over the course of the winter in Aloha, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 2 hours, 9 minutes, implying an average daily increase of 1 minute, 27 seconds, and weekly increase of 10 minutes, 11 seconds.

The shortest day of the winter is December 20, with 8 hours, 42 minutes of daylight and the longest day is February 28, with 11 hours, 7 minutes of daylight.

The latest sunrise of the winter in Aloha is 7:51 AM on January 1 and the earliest sunrise is 1 hour, 1 minute earlier at 6:50 AM on February 28.

The earliest sunset is 4:27 PM on December 9 and the latest sunset is 1 hour, 30 minutes later at 5:57 PM on February 28.

Daylight saving time is observed in Aloha during 2024, but it neither starts nor ends during the winter, so the entire season is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:22 AM and sets 15 hours, 41 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:48 AM and sets 8 hours, 42 minutes later, at 4:31 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the winter of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Aloha is essentially constant during the winter, remaining around 0% throughout.

For reference, on August 5, the muggiest day of the year, there are muggy conditions 1% of the time, while on November 6, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Aloha is gradually decreasing during the winter, decreasing from 6.1 miles per hour to 5.5 miles per hour over the course of the season.

For reference, on December 2, the windiest day of the year, the daily average wind speed is 6.1 miles per hour, while on August 22, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.

The highest daily average wind speed during the winter is 6.1 miles per hour on December 2.

The wind direction in Aloha during the winter is predominantly out of the south from December 1 to January 1, from January 3 to January 22, and from February 2 to February 28 and the east from January 1 to January 3 and from January 22 to February 2.

Aloha is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Aloha is gradually decreasing during the winter, falling by 2°F, from 51°F to 49°F, over the course of the season.

The lowest average surface water temperature during the winter is 49°F on February 14.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Aloha typically lasts for 7.3 months (222 days), from around March 28 to around November 5, rarely starting before February 28 or after April 29, and rarely ending before October 14 or after December 3.

The winter in Aloha is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of 0% on January 13.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Aloha are very rapidly decreasing during the winter, decreasing by 2,346°F, from 2,371°F to 25°F, over the course of the season.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Aloha is increasing during the winter, rising by 1.4 kWh, from 1.1 kWh to 2.4 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 1.0 kWh on December 25.

For the purposes of this report, the geographical coordinates of Aloha are 45.494 deg latitude, -122.867 deg longitude, and 210 ft elevation.

The topography within 2 miles of Aloha contains only modest variations in elevation, with a maximum elevation change of 322 feet and an average elevation above sea level of 205 feet. Within 10 miles contains only modest variations in elevation (1,243 feet). Within 50 miles contains very significant variations in elevation (5,210 feet).

The area within 2 miles of Aloha is covered by artificial surfaces (92%), within 10 miles by artificial surfaces (43%) and cropland (37%), and within 50 miles by trees (46%) and cropland (22%).