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Average Weather in Lake Nacimiento California, United States

In Lake Nacimiento, the summers are warm, arid, and clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 38°F to 83°F and is rarely below 30°F or above 91°F.

Climate Summary

92%92%52%52%clearovercastprecipitation: 3.0 inprecipitation: 3.0 in0.0 in0.0 inmuggy: 0%muggy: 0%0%0%drydrycoolcomfortablewarmcooltourism score: 6.7tourism score: 6.70.80.8JanFebMarAprMayJunJulAugSepOctNovDec
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Lake Nacimiento for warm-weather activities is from late June to mid September.

Temperature

The warm season lasts for 3.6 months, from June 13 to September 30, with an average daily high temperature above 78°F. The hottest day of the year is August 2, with an average high of 83°F and low of 54°F.

The cool season lasts for 3.6 months, from November 22 to March 8, with an average daily high temperature below 62°F. The coldest day of the year is December 30, with an average low of 38°F and high of 57°F.

Average High and Low Temperature

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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Lake NacimientoJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoolwarmvery coldcomfortable
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

In Lake Nacimiento, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Lake Nacimiento begins around May 7 and lasts for 5.8 months, ending around October 31. On August 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 92% of the time, and overcast or mostly cloudy 8% of the time.

The cloudier part of the year begins around October 31 and lasts for 6.2 months, ending around May 7. On February 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover Categories

Cloud Cover Categories in Lake NacimientoclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 892%Aug 892%Feb 1752%Feb 1752%May 772%May 772%Oct 3172%Oct 3172%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

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Lake Nacimiento varies throughout the year.

The wetter season lasts 4.6 months, from November 13 to March 31, with a greater than 13% chance of a given day being a wet day. The chance of a wet day peaks at 25% on February 20.

The drier season lasts 7.4 months, from March 31 to November 13. The smallest chance of a wet day is 0% on July 25.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 25% on February 20.

Daily Chance of Precipitation

Daily Chance of Precipitation in Lake NacimientowetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 2025%Feb 2025%Jul 250%Jul 250%Jan 120%Jan 120%Nov 1313%Nov 1313%Mar 3113%Mar 3113%rain
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Lake Nacimiento experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from October 12 to April 28, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 15, with an average total accumulation of 3.0 inches.

The rainless period of the year lasts for 5.5 months, from April 28 to October 12. The least rain falls around August 2, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

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

The length of the day in Lake Nacimiento varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 44 minutes of daylight; the longest day is June 20, with 14 hours, 35 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Lake NacimientoJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 35 minJun 2014 hr, 35 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 44 minDec 219 hr, 44 minDec 21nightnightday
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 is at 5:46 AM on June 12, and the latest sunrise is 1 hour, 42 minutes later at 7:28 AM on November 4. The earliest sunset is at 4:49 PM on December 5, and the latest sunset is 3 hours, 34 minutes later at 8:23 PM on June 28.

Daylight saving time (DST) is observed in Lake Nacimiento during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Lake NacimientoJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:46 AMJun 125:46 AM8:23 PMJun 288:23 PMJun 28Dec 54:49 PMDec 54:49 PM7:28 AMNov 47:28 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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.

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 perceived humidity level in Lake Nacimiento, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Lake NacimientoJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 70%Feb 70%Sep 20%Sep 20%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 Lake Nacimiento experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 3.7 months, from March 12 to July 4, with average wind speeds of more than 7.9 miles per hour. The windiest day of the year is May 29, with an average hourly wind speed of 9.1 miles per hour.

The calmer time of year lasts for 8.3 months, from July 4 to March 12. The calmest day of the year is September 16, with an average hourly wind speed of 6.8 miles per hour.

Average Wind Speed

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

The predominant average hourly wind direction in Lake Nacimiento varies throughout the year.

The wind is most often from the west for 4.5 months, from May 12 to September 28, with a peak percentage of 67% on July 30. The wind is most often from the north for 7.5 months, from September 28 to May 12, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction in Lake NacimientoNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westnorthsoutheast
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

Lake Nacimiento 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.1 months, from July 30 to November 2, with an average temperature above 59°F. The day of the year with the warmest water is September 24, with an average temperature of 60°F.

The time of year with cooler water lasts for 3.1 months, from March 6 to June 9, with an average temperature below 55°F. The day of the year with the coolest water is April 17, with an average temperature of 54°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Lake Nacimiento throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Lake Nacimiento for general outdoor tourist activities is from late June to mid September, with a peak score in the last week of July.

Tourism Score

Tourism Score in Lake Nacimientobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.70.80.8 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Lake Nacimiento for hot-weather activities is from late June to late August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score in Lake Nacimientobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468102.82.80.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Lake Nacimiento typically lasts for 9.6 months (290 days), from around February 14 to around December 1, rarely starting after March 29, or ending before November 8.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Lake Nacimientogrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 1450%Feb 1450%Dec 150%Dec 190%Mar 2990%Mar 2990%Nov 890%Nov 819%Dec 2919%Dec 29Jul 18100%Jul 18100%warmcoldcoolvery coldcomfortablehot
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.

Based on growing degree days alone, the first spring blooms in Lake Nacimiento should appear around February 12, only rarely appearing before January 29 or after March 2.

Growing Degree Days

The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.7 months, from May 2 to August 24, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 22, with an average of 8.6 kWh.

The darker period of the year lasts for 3.4 months, from November 6 to February 16, with an average daily incident shortwave energy per square meter below 3.8 kWh. The darkest day of the year is December 23, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Lake NacimientobrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 228.6 kWhJun 228.6 kWhDec 232.6 kWhDec 232.6 kWhMay 27.4 kWhMay 27.4 kWhAug 247.4 kWhAug 247.4 kWhNov 63.8 kWhNov 63.8 kWhFeb 163.8 kWhFeb 163.8 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 Lake Nacimiento are 35.728 deg latitude, -120.880 deg longitude, and 1,076 ft elevation.

The topography within 2 miles of Lake Nacimiento contains very significant variations in elevation, with a maximum elevation change of 981 feet and an average elevation above sea level of 1,091 feet. Within 10 miles contains very significant variations in elevation (2,431 feet). Within 50 miles contains large variations in elevation (5,850 feet).

The area within 2 miles of Lake Nacimiento is covered by grassland (71%) and shrubs (21%), within 10 miles by grassland (62%) and shrubs (26%), and within 50 miles by grassland (41%) and water (29%).

Data Sources

This report illustrates the typical weather in Lake Nacimiento, 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 Lake Nacimiento.

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

The stations contributing to this reconstruction are: Paso Robles Municipal Airport (73%, 24 kilometers, east) and Point Piedras Blanca (27%, 37 kilometers, west).

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.