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April Weather in Ferndale California, United States

Daily high temperatures are around 57°F, rarely falling below 52°F or exceeding 63°F.

Daily low temperatures increase by 2°F, from 44°F to 46°F, rarely falling below 37°F or exceeding 51°F.

For reference, on September 11, the hottest day of the year, temperatures in Ferndale typically range from 49°F to 62°F, while on December 23, the coldest day of the year, they range from 42°F to 55°F.

Average High and Low Temperature in April in Ferndale

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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.

Average Hourly Temperature in April in Ferndale

Average Hourly Temperature in April in Ferndale1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMaycoldcoolvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ancud, Chile (6,519 miles away) and Cygnet, Australia (7,995 miles) are the far-away foreign places with temperatures most similar to Ferndale (view comparison).

Compare Ferndale to another city:

Clouds

The month of April in Ferndale experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 59% to 51%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 49% of the time.

For reference, on January 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.

Cloud Cover Categories in April in Ferndale

Cloud Cover Categories in April in Ferndale181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 141%Apr 141%Apr 3049%Apr 3049%Apr 1143%Apr 1143%Apr 2146%Apr 2146%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ferndale, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 34% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 46% on December 14, and its lowest chance is 1% on August 4.

Probability of Precipitation in April in Ferndale

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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

The average sliding 31-day rainfall during April in Ferndale is very rapidly decreasing, starting the month at 4.7 inches, when it rarely exceeds 10.5 inches or falls below 1.1 inches, and ending the month at 2.2 inches, when it rarely exceeds 4.4 inches or falls below 0.4 inches.

Average Monthly Rainfall in April in Ferndale

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

Over the course of April in Ferndale, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 13 minutes, implying an average daily increase of 2 minutes, 32 seconds, and weekly increase of 17 minutes, 44 seconds.

The shortest day of the month is April 1, with 12 hours, 42 minutes of daylight and the longest day is April 30, with 13 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in April in Ferndale

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the month in Ferndale is 7:00 AM on April 1 and the earliest sunrise is 43 minutes earlier at 6:16 AM on April 30.

The earliest sunset is 7:42 PM on April 1 and the latest sunset is 30 minutes later at 8:12 PM on April 30.

Daylight saving time is observed in Ferndale during 2021, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:46 AM and sets 15 hours, 5 minutes later, at 8:51 PM, while on December 21, the shortest day of the year, it rises at 7:37 AM and sets 9 hours, 16 minutes later, at 4:53 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April in Ferndale

Sunrise & Sunset with Twilight and Daylight Saving Time in April in Ferndale181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay6:16 AM6:16 AMApr 308:12 PMApr 308:12 PM7:00 AM7:00 AMApr 17:42 PMApr 17:42 PM6:44 AM6:44 AMApr 117:52 PMApr 117:52 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of April. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Moon

The figure below presents a compact representation of key lunar data for April 2021. 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.

Moon Rise, Set & Phases in April in Ferndale

Moon Rise, Set & Phases in April in Ferndale1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 132:22 AMMar 132:22 AMMar 2811:49 AMMar 2811:49 AMApr 117:31 PMApr 117:31 PMApr 268:32 PMApr 268:32 PMMay 1112:01 PMMay 1112:01 PMMay 264:15 AMMay 264:15 AM7:04 AM7:04 AM6:49 PM6:49 PM6:34 PM6:34 PM7:27 AM7:27 AM6:54 AM6:54 AM7:41 PM7:41 PM7:55 PM7:55 PM6:53 AM6:53 AM6:10 AM6:10 AM8:34 PM8:34 PM8:04 PM8:04 PM6:02 AM6:02 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

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 Ferndale is essentially constant during April, remaining around 0% throughout.

For reference, on May 15, 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.

Humidity Comfort Levels in April in Ferndale

Humidity Comfort Levels in April in Ferndale181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 10%Apr 10%Apr 300%Apr 300%Apr 110%Apr 110%Apr 210%Apr 210%drydrycomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Ferndale is essentially constant during April, remaining within 0.2 miles per hour of 10.5 miles per hour throughout.

For reference, on June 23, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on October 6, the calmest day of the year, the daily average wind speed is 9.1 miles per hour.

The lowest daily average wind speed during April is 10.3 miles per hour on April 19.

Average Wind Speed in April in Ferndale

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Ferndale throughout April is predominantly from the north, with a peak proportion of 65% on April 30.

Wind Direction in April in Ferndale

Wind Direction in April in Ferndale181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMaysouthnorthwesteast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Ferndale 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 Ferndale is essentially constant during April, remaining around 52°F throughout.

The lowest average surface water temperature during April is 51°F on April 6.

Average Water Temperature in April in Ferndale

Average Water Temperature in April in Ferndale1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303048°F48°F49°F49°F50°F50°F51°F51°F52°F52°F53°F53°F54°F54°F55°F55°F56°F56°FMarMayApr 651°FApr 651°FApr 3052°FApr 3052°FApr 2152°FApr 2152°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

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 Ferndale typically lasts for 11 months (333 days), from around January 25 to around December 24, rarely starting after March 5, or ending before November 21.

The month of April in Ferndale is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in April in Ferndale

Time Spent in Various Temperature Bands and the Growing Season in April in Ferndalegrowing season181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMay100%Apr 16100%Apr 1690%Mar 590%Mar 5very coldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing 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 in Ferndale are gradually increasing during April, increasing by 65°F, from 177°F to 242°F, over the course of the month.

Growing Degree Days in April in Ferndale

The average growing degree days accumulated over the course of April, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Ferndale is increasing during April, rising by 1.4 kWh, from 4.8 kWh to 6.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April in Ferndale

Average Daily Incident Shortwave Solar Energy in April in Ferndale181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhMarMayApr 14.8 kWhApr 14.8 kWhApr 306.2 kWhApr 306.2 kWhApr 115.2 kWhApr 115.2 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Ferndale are 40.576 deg latitude, -124.264 deg longitude, and 52 ft elevation.

The topography within 2 miles of Ferndale contains very significant variations in elevation, with a maximum elevation change of 988 feet and an average elevation above sea level of 192 feet. Within 10 miles contains very significant variations in elevation (2,602 feet). Within 50 miles contains large variations in elevation (5,866 feet).

The area within 2 miles of Ferndale is covered by cropland (49%) and trees (41%), within 10 miles by trees (34%) and water (26%), and within 50 miles by water (54%) and trees (30%).

Data Sources

This report illustrates the typical weather in Ferndale, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Ferndale.

For each station, the records are corrected for the elevation difference between that station and Ferndale according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Ferndale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ferndale and a given station.

The stations contributing to this reconstruction are: Arcata-Eureka Airport (KACV, 89%, 47 kilometers, north) and Ukiah Municipal Airport (KUKI, 11%, 185 kilometers, southeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.