Spring Weather at Arcata-Eureka Airport United States

Daily high temperatures increase by 5°F, from 56°F to 61°F, rarely falling below 50°F or exceeding 65°F.

Daily low temperatures increase by 6°F, from 43°F to 49°F, rarely falling below 34°F or exceeding 54°F.

For reference, on September 10, the hottest day of the year, temperatures at Arcata-Eureka Airport typically range from 50°F to 65°F, while on December 22, the coldest day of the year, they range from 41°F to 54°F.

The figure below shows you a compact characterization of the hourly average spring 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.

Ancud, Chile (6,536 miles away) and Cygnet, Australia (8,018 miles) are the far-away foreign places with temperatures most similar to Arcata-Eureka Airport (view comparison).

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The spring at Arcata-Eureka Airport experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 67% to 41%.

The clearest day of the spring is May 31, with clear, mostly clear, or partly cloudy conditions 59% of the time.

For reference, on January 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Arcata-Eureka Airport, the chance of a wet day over the course of the spring is very rapidly decreasing, starting the season at 46% and ending it at 12%.

For reference, the year's highest daily chance of a wet day is 47% on December 3, and its lowest chance is 1% on August 2.

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 spring at Arcata-Eureka Airport is very rapidly decreasing, starting the season at 6.7 inches, when it rarely exceeds 11.9 inches or falls below 2.5 inches, and ending the season at 1.0 inches, when it rarely exceeds 3.1 inches.

Over the course of the spring at Arcata-Eureka Airport, 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 3 hours, 36 minutes, implying an average daily increase of 2 minutes, 23 seconds, and weekly increase of 16 minutes, 39 seconds.

The shortest day of the spring is March 1, with 11 hours, 19 minutes of daylight and the longest day is May 31, with 14 hours, 55 minutes of daylight.

The latest sunrise of the spring at Arcata-Eureka Airport is 7:35 AM on March 10 and the earliest sunrise is 1 hour, 48 minutes earlier at 5:46 AM on May 31.

The earliest sunset is 6:08 PM on March 1 and the latest sunset is 2 hours, 34 minutes later at 8:42 PM on May 31.

Daylight saving time (DST) ends at 3:00 AM on March 10, 2024, shifting sunrise and sunset to be an hour earlier.

For reference, on June 20, the longest day of the year, the Sun rises at 5:44 AM and sets 15 hours, 8 minutes later, at 8:51 PM, while on December 21, the shortest day of the year, it rises at 7:38 AM and sets 9 hours, 14 minutes later, at 4:51 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 spring 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 at Arcata-Eureka Airport is essentially constant during the spring, remaining around 0% throughout.

For reference, on May 12, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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 at Arcata-Eureka Airport is essentially constant during the spring, remaining within 0.5 miles per hour of 8.5 miles per hour throughout.

For reference, on December 12, the windiest day of the year, the daily average wind speed is 9.2 miles per hour, while on September 24, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.

The lowest daily average wind speed during the spring is 8.0 miles per hour on April 18.

The wind direction at Arcata-Eureka Airport during the spring is predominantly out of the south from March 1 to March 14 and the north from March 14 to May 31.

Arcata-Eureka Airport 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 at Arcata-Eureka Airport is essentially constant during the spring, remaining within 1°F of 52°F throughout.

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 at Arcata-Eureka Airport typically lasts for 9.3 months (282 days), from around February 28 to around December 6, rarely starting after April 3, or ending before November 8.

The spring at Arcata-Eureka Airport is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 52% to 100% over the course of the season.

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 at Arcata-Eureka Airport are increasing during the spring, increasing by 245°F, from 112°F to 357°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 at Arcata-Eureka Airport is very rapidly increasing during the spring, rising by 4.1 kWh, from 3.1 kWh to 7.2 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Arcata-Eureka Airport are 40.972 deg latitude, -124.107 deg longitude, and 200 ft elevation.

The topography within 2 miles of Arcata-Eureka Airport contains significant variations in elevation, with a maximum elevation change of 495 feet and an average elevation above sea level of 142 feet. Within 10 miles contains significant variations in elevation (2,877 feet). Within 50 miles contains large variations in elevation (7,503 feet).

The area within 2 miles of Arcata-Eureka Airport is covered by trees (30%), herbaceous vegetation (23%), water (23%), and cropland (11%), within 10 miles by trees (44%) and water (40%), and within 50 miles by water (44%) and trees (41%).