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Average Weather in January in Cayucos California, United States

In Cayucos, the month of January is characterized by essentially constant daily high temperatures, with daily highs around 61°F throughout the month, rarely exceeding 70°F or dropping below 55°F.

Daily low temperatures are around 44°F, rarely falling below 37°F or exceeding 53°F. The lowest daily average low temperature is 44°F on January 3.

For reference, on August 24, the hottest day of the year, temperatures in Cayucos typically range from 55°F to 74°F, while on January 3, the coldest day of the year, they range from 44°F to 61°F.

Average High and Low Temperature in January

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 January. 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 January

Average Hourly Temperature in January in Cayucos12 AM4 AM8 AM12 PM4 PM8 PM12 AM181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131DecFebcoldcoolchilly
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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 January in Cayucos experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 44% throughout the month.

The clearest day of the month is January 27, with clear, mostly clear, or partly cloudy conditions 57% of the time.

For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.

Cloud Cover in January

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

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cayucos, the chance of a wet day over the course of January is essentially constant, remaining around 20% throughout.

For reference, the year's highest daily chance of a wet day is 25% on February 20, and its lowest chance is 0% on July 29.

Probability of Precipitation in January

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 January in Cayucos is essentially constant, remaining about 2.6 inches throughout, and rarely exceeding 6.2 inches or falling below 0.1 inches.

Average Monthly Rainfall in January

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 January in Cayucos, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 38 minutes, implying an average daily increase of 1 minute, 16 seconds, and weekly increase of 8 minutes, 53 seconds.

The shortest day of the month is January 1, with 9 hours, 49 minutes of daylight and the longest day is January 31, with 10 hours, 27 minutes of daylight.

Hours of Daylight and Twilight in January

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 Cayucos is 7:13 AM on January 6 and the earliest sunrise is 10 minutes earlier at 7:03 AM on January 31.

The earliest sunset is 5:02 PM on January 1 and the latest sunset is 29 minutes later at 5:30 PM on January 31.

Daylight saving time is observed in Cayucos during 2017, but it neither starts nor ends during January, so the entire month is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:48 AM and sets 14 hours, 33 minutes later, at 8:22 PM, while on December 21, the shortest day of the year, it rises at 7:09 AM and sets 9 hours, 46 minutes later, at 4:54 PM.

Sunrise & Sunset with Twilight in January

The solar day over the course of January. 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 Cayucos is essentially constant during January, remaining around 0% throughout.

For reference, on July 6, 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 January

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 Cayucos is essentially constant during January, remaining within 0.1 miles per hour of 4.5 miles per hour throughout.

For reference, on May 24, the windiest day of the year, the daily average wind speed is 5.4 miles per hour, while on September 16, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.

The lowest daily average wind speed during January is 4.4 miles per hour on January 13.

Average Wind Speed in January

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 Cayucos throughout January is predominantly from the north, with a peak proportion of 42% on January 22.

Wind Direction in January

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

Cayucos 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 Cayucos is essentially constant during January, remaining around 56°F throughout.

Average Water Temperature in January

The daily average water temperature (purple line), 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 Cayucos is gradually increasing during January, rising by 0.6 kWh, from 2.7 kWh to 3.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in January

Average Daily Incident Shortwave Solar Energy in January in Cayucos0.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWh4.5 kWh5.0 kWh5.5 kWh181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131DecFebJan 12.7 kWhJan 12.7 kWhJan 313.3 kWhJan 313.3 kWhJan 112.8 kWhJan 112.8 kWhJan 213.1 kWhJan 213.1 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 Cayucos are 35.443 deg latitude, -120.892 deg longitude, and 164 ft elevation.

The topography within 2 miles of Cayucos contains significant variations in elevation, with a maximum elevation change of 712 feet and an average elevation above sea level of 167 feet. Within 10 miles contains significant variations in elevation (2,569 feet). Within 50 miles contains large variations in elevation (4,314 feet).

The area within 2 miles of Cayucos is covered by water (46%) and grassland (41%), within 10 miles by grassland (43%) and water (34%), and within 50 miles by water (43%) and grassland (33%).

Data Sources

This report illustrates the typical weather in Cayucos 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Cayucos.

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

The stations contributing to this reconstruction are: San Luis Obispo County Airport (42%, 32 kilometers, southeast); Paso Robles Municipal Airport (31%, 35 kilometers, northeast); and Point Piedras Blanca (27%, 43 kilometers, northwest).

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.