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Spring Weather in Lucas Valley-Marinwood California, United States

Daily high temperatures increase by 10°F, from 61°F to 71°F, rarely falling below 54°F or exceeding 82°F.

Daily low temperatures increase by 5°F, from 44°F to 49°F, rarely falling below 38°F or exceeding 54°F.

For reference, on September 6, the hottest day of the year, temperatures in Lucas Valley-Marinwood typically range from 51°F to 77°F, while on December 30, the coldest day of the year, they range from 40°F to 54°F.

Average High and Low Temperature in the Spring in Lucas Valley-Marinwood

Average High and Low Temperature in the Spring in Lucas Valley-MarinwoodMarAprMay30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FWinterSummerMar 161°FMar 161°F44°F44°FMay 3171°FMay 3171°F49°F49°FApr 164°FApr 164°F45°F45°FMay 168°FMay 168°F47°F47°FNowNow
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 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.

Average Hourly Temperature in the Spring in Lucas Valley-Marinwood

Average Hourly Temperature in the Spring in Lucas Valley-MarinwoodMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummerNowNowvery coldcoldcoldcoolcomfortable
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.

Coronel, Chile (6,076 miles away); São Joaquim, Brazil (6,563 miles); and Mount Barker, Australia (9,145 miles) are the far-away foreign places with temperatures most similar to Lucas Valley-Marinwood (view comparison).

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The spring in Lucas Valley-Marinwood experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 54% to 27%.

The clearest day of the spring is May 31, with clear, mostly clear, or partly cloudy conditions 73% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.

Cloud Cover Categories in the Spring in Lucas Valley-Marinwood

Cloud Cover Categories in the Spring in Lucas Valley-MarinwoodMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerMar 146%Mar 146%May 3173%May 3173%Apr 154%Apr 154%May 162%May 162%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lucas Valley-Marinwood, the chance of a wet day over the course of the spring is very rapidly decreasing, starting the season at 31% and ending it at 5%.

For reference, the year's highest daily chance of a wet day is 32% on February 20, and its lowest chance is -0% on July 27.

Probability of Precipitation in the Spring in Lucas Valley-Marinwood

Probability of Precipitation in the Spring in Lucas Valley-MarinwoodMarAprMay0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%WinterSummerMar 131%Mar 131%May 315%May 315%Apr 118%Apr 118%May 110%May 110%NowNowrain
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 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 in Lucas Valley-Marinwood is very rapidly decreasing, starting the season at 4.1 inches, when it rarely exceeds 8.2 inches or falls below 0.7 inches, and ending the season at 0.4 inches, when it rarely exceeds 1.4 inches or falls below -0.0 inches.

Average Monthly Rainfall in the Spring in Lucas Valley-Marinwood

Average Monthly Rainfall in the Spring in Lucas Valley-MarinwoodMarAprMay0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inWinterSummerMar 14.1 inMar 14.1 inMay 310.4 inMay 310.4 inApr 12.0 inApr 12.0 inMay 10.8 inMay 10.8 inNowNow
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 snowfall.

Over the course of the spring in Lucas Valley-Marinwood, 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, 14 minutes, implying an average daily increase of 2 minutes, 8 seconds, and weekly increase of 14 minutes, 57 seconds.

The shortest day of the spring is March 1, with 11 hours, 23 minutes of daylight and the longest day is May 31, with 14 hours, 38 minutes of daylight.

Hours of Daylight and Twilight in the Spring in Lucas Valley-Marinwood

Hours of Daylight and Twilight in the Spring in Lucas Valley-MarinwoodMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummerMar 1912 hr, 8 minMar 1912 hr, 8 minnightnightdaydayMay 3114 hr, 38 minMay 3114 hr, 38 minMay 113 hr, 49 minMay 113 hr, 49 minNowNow
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 spring in Lucas Valley-Marinwood is 7:27 AM on March 10 and the earliest sunrise is 1 hour, 39 minutes earlier at 5:49 AM on May 31.

The earliest sunset is 6:04 PM on March 1 and the latest sunset is 2 hours, 23 minutes later at 8:27 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 5:47 AM and sets 14 hours, 49 minutes later, at 8:36 PM, while on December 21, the shortest day of the year, it rises at 7:23 AM and sets 9 hours, 31 minutes later, at 4:54 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Spring in Lucas Valley-Marinwood

Sunrise & Sunset with Twilight and Daylight Saving Time in the Spring in Lucas Valley-MarinwoodMarAprMay2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer5:49 AM5:49 AMMay 318:27 PMMay 318:27 PM6:41 AM6:41 AMMar 16:04 PMMar 16:04 PM6:54 AM6:54 AMApr 17:34 PMApr 17:34 PM6:13 AM6:13 AMMay 18:01 PMMay 18:01 PMMar 10DSTMar 10DSTSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the spring. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

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.

Solar Elevation and Azimuth in the Spring in Lucas Valley-Marinwood

Solar Elevation and Azimuth in the Spring in Lucas Valley-MarinwoodMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummer001020303040506001010203040506070NowNow
northeastsouthwest
Solar elevation and azimuth in the the spring of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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.

Moon Rise, Set & Phases in the Spring in Lucas Valley-Marinwood

Moon Rise, Set & Phases in the Spring in Lucas Valley-MarinwoodMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerFeb 93:00 PMFeb 93:00 PMFeb 244:31 AMFeb 244:31 AMMar 101:01 AMMar 101:01 AMMar 2512:01 AMMar 2512:01 AMApr 811:22 AMApr 811:22 AMApr 234:50 PMApr 234:50 PMMay 78:23 PMMay 78:23 PMMay 236:54 AMMay 236:54 AMJun 65:38 AMJun 65:38 AMJun 216:09 PMJun 216:09 PM7:19 AM7:19 AM5:37 PM5:37 PM5:21 PM5:21 PM7:11 AM7:11 AM7:49 AM7:49 AM7:59 PM7:59 PM7:10 PM7:10 PM7:20 AM7:20 AM8:02 PM8:02 PM8:00 PM8:00 PM6:33 AM6:33 AM8:08 PM8:08 PM7:58 PM7:58 PM5:38 AM5:38 AM5:31 AM5:31 AM9:23 PM9:23 PM8:59 PM8:59 PM6:01 AM6:01 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.

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 Lucas Valley-Marinwood is essentially constant during the spring, remaining around 0% throughout.

For reference, on September 11, 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 the Spring in Lucas Valley-Marinwood

Humidity Comfort Levels in the Spring in Lucas Valley-MarinwoodMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerMar 10%Mar 10%May 310%May 310%Apr 10%Apr 10%May 10%May 10%comfortablecomfortabledrydryhumidhumid
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.

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 Lucas Valley-Marinwood is gradually increasing during the spring, increasing from 8.3 miles per hour to 9.0 miles per hour over the course of the season.

For reference, on May 30, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on October 20, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.

The highest daily average wind speed during the spring is 9.1 miles per hour on May 30.

Average Wind Speed in the Spring in Lucas Valley-Marinwood

Average Wind Speed in the Spring in Lucas Valley-MarinwoodMarAprMay0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphWinterSummerMay 309.1 mphMay 309.1 mphMar 18.3 mphMar 18.3 mphApr 18.6 mphApr 18.6 mphMay 18.8 mphMay 18.8 mphNowNow
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 Lucas Valley-Marinwood throughout the spring is predominantly from the west, with a peak proportion of 83% on May 31.

Wind Direction in the Spring in Lucas Valley-Marinwood

Wind Direction in the Spring in Lucas Valley-MarinwoodNWMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerNowNowwestnorthsoutheast
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).

Lucas Valley-Marinwood 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 Lucas Valley-Marinwood is essentially constant during the spring, remaining within 1°F of 53°F throughout.

The lowest average surface water temperature during the spring is 52°F on May 11.

Average Water Temperature in the Spring in Lucas Valley-Marinwood

Average Water Temperature in the Spring in Lucas Valley-MarinwoodMarAprMay49°F49°F50°F50°F51°F51°F52°F52°F53°F53°F54°F54°F55°F55°F56°F56°F57°F57°FWinterSummerMay 1152°FMay 1152°FMar 153°FMar 153°FMay 3153°FMay 3153°FApr 153°FApr 153°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Lucas Valley-Marinwood typically lasts for 11 months (336 days), from around January 13 to around December 15, rarely starting after February 13, or ending before November 19.

The spring in Lucas Valley-Marinwood is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Spring in Lucas Valley-Marinwood

Time Spent in Various Temperature Bands and the Growing Season in the Spring in Lucas Valley-Marinwoodgrowing seasonMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummer100%Apr 16100%Apr 1690%Feb 1390%Feb 13NowNowvery coldcoldcoolcomfortablewarm
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 Lucas Valley-Marinwood are rapidly increasing during the spring, increasing by 530°F, from 124°F to 654°F, over the course of the season.

Growing Degree Days in the Spring in Lucas Valley-Marinwood

Growing Degree Days in the Spring in Lucas Valley-MarinwoodMarAprMay100°F100°F200°F200°F300°F300°F400°F400°F500°F500°F600°F600°F700°F700°F800°F800°FWinterSummerMar 1124°FMar 1124°FMay 31654°FMay 31654°FApr 1248°FApr 1248°FMay 1419°FMay 1419°FNowNow
The average growing degree days accumulated over the course of the spring, with 25th to 75th and 10th to 90th percentile bands.

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 Lucas Valley-Marinwood is very rapidly increasing during the spring, rising by 4.0 kWh, from 3.8 kWh to 7.9 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Spring in Lucas Valley-Marinwood

Average Daily Incident Shortwave Solar Energy in the Spring in Lucas Valley-MarinwoodMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhWinterSummerMar 13.8 kWhMar 13.8 kWhMay 317.9 kWhMay 317.9 kWhApr 15.6 kWhApr 15.6 kWhMay 16.9 kWhMay 16.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Lucas Valley-Marinwood are 38.040 deg latitude, -122.576 deg longitude, and 643 ft elevation.

The topography within 2 miles of Lucas Valley-Marinwood contains very significant variations in elevation, with a maximum elevation change of 1,709 feet and an average elevation above sea level of 528 feet. Within 10 miles contains very significant variations in elevation (2,575 feet). Within 50 miles contains large variations in elevation (4,311 feet).

The area within 2 miles of Lucas Valley-Marinwood is covered by trees (41%), grassland (28%), and artificial surfaces (17%), within 10 miles by trees (29%) and grassland (21%), and within 50 miles by water (41%) and grassland (19%).

This report illustrates the typical weather in Lucas Valley-Marinwood, 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 Lucas Valley-Marinwood.

For each station, the records are corrected for the elevation difference between that station and Lucas Valley-Marinwood 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 Lucas Valley-Marinwood is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lucas Valley-Marinwood and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Lucas Valley-Marinwood and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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 © OpenStreetMap contributors.

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.

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