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Average Weather in July in Aptos Hills-Larkin Valley California, United States

In Aptos Hills-Larkin Valley, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 71°F throughout the month, rarely exceeding 79°F or dropping below 65°F.

Daily low temperatures are around 54°F, rarely falling below 49°F or exceeding 58°F.

For reference, on October 2, the hottest day of the year, temperatures in Aptos Hills-Larkin Valley typically range from 52°F to 74°F, while on January 2, the coldest day of the year, they range from 41°F to 59°F.

Average High and Low Temperature in July

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 July. 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 July

Average Hourly Temperature in July in Aptos Hills-Larkin Valley18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJunAugcoldcoolcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Clouds

The month of July in Aptos Hills-Larkin Valley experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 13% to 9%.

The clearest day of the month is July 29, with clear, mostly clear, or partly cloudy conditions 91% of the time.

For reference, on February 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on August 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

Cloud Cover Categories in July

Cloud Cover Categories in July in Aptos Hills-Larkin Valley1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 187%Jul 187%Jul 3191%Jul 3191%Jul 1189%Jul 1189%Jul 2191%Jul 2191%clearovercastmostly clearpartly cloudymostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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 July in Aptos Hills-Larkin Valley is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.

Average Monthly Rainfall in July

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 July in Aptos Hills-Larkin Valley, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 36 minutes, implying an average daily decrease of 1 minute, 13 seconds, and weekly decrease of 8 minutes, 30 seconds.

The shortest day of the month is July 31, with 14 hours, 3 minutes of daylight and the longest day is July 1, with 14 hours, 39 minutes of daylight.

Hours of Daylight and Twilight in July

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 earliest sunrise of the month in Aptos Hills-Larkin Valley is 5:51 AM on July 1 and the latest sunrise is 20 minutes later at 6:12 AM on July 31.

The latest sunset is 8:30 PM on July 1 and the earliest sunset is 16 minutes earlier at 8:14 PM on July 31.

Daylight saving time is observed in Aptos Hills-Larkin Valley during 2017, but it neither starts nor ends during July, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:48 AM and sets 14 hours, 42 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 37 minutes later, at 4:54 PM.

Sunrise & Sunset with Twilight in July

The solar day over the course of July. 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.

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 Aptos Hills-Larkin Valley is essentially constant during July, remaining around 0% throughout.

For reference, on October 3, 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 July

Humidity Comfort Levels in July in Aptos Hills-Larkin Valley1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%JunAugJul 10%Jul 10%Jul 310%Jul 310%Jul 110%Jul 110%Jul 210%Jul 210%drydrycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Aptos Hills-Larkin Valley is gradually decreasing during July, decreasing from 6.2 miles per hour to 5.7 miles per hour over the course of the month.

For reference, on May 30, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on September 16, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.

Average Wind Speed in July

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 Aptos Hills-Larkin Valley throughout July is predominantly from the west, with a peak proportion of 89% on July 30.

Wind Direction in July

Wind Direction in July in Aptos Hills-Larkin Valley1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugwestnorthsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 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

Aptos Hills-Larkin Valley 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 Aptos Hills-Larkin Valley is gradually increasing during July, rising by 2°F, from 55°F to 57°F, over the course of the month.

Average Water Temperature in July

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).

While it does not do so every year, freezing temperatures are seen in Aptos Hills-Larkin Valley over some winters. The day least likely to be in the growing season is January 2, with a 52% chance.

Time Spent in Various Temperature Bands and the Growing Season in July

Time Spent in Various Temperature Bands and the Growing Season in July in Aptos Hills-Larkin Valleygrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16coolcoldcomfortablewarm
The percentage of time spent in various temperature bands: 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 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 Aptos Hills-Larkin Valley is increasing during July, increasing by 313°F, from 1,021°F to 1,334°F, over the course of the month.

Growing Degree Days in July

The average growing degree days accumulated over the course of July, 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 Aptos Hills-Larkin Valley is essentially constant during July, remaining within 0.2 kWh of 8.3 kWh throughout.

Average Daily Incident Shortwave Solar Energy in July

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 Aptos Hills-Larkin Valley are 36.961 deg latitude, -121.834 deg longitude, and 246 ft elevation.

The topography within 2 miles of Aptos Hills-Larkin Valley contains significant variations in elevation, with a maximum elevation change of 600 feet and an average elevation above sea level of 313 feet. Within 10 miles contains significant variations in elevation (3,465 feet). Within 50 miles also contains extreme variations in elevation (5,046 feet).

The area within 2 miles of Aptos Hills-Larkin Valley is covered by artificial surfaces (24%), shrubs (22%), trees (21%), and cropland (19%), within 10 miles by trees (27%) and water (26%), and within 50 miles by water (33%) and grassland (24%).

Data Sources

This report illustrates the typical weather in Aptos Hills-Larkin Valley year round, 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 Aptos Hills-Larkin Valley.

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

The stations contributing to this reconstruction are: Watsonville Municipal Airport (95%, 4.9 kilometers, southeast) and Reid-Hillview of Santa Clara County Airport (4.6%, 41 kilometers, north).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.