Average Weather in November in Portola California, United States
Daily high temperatures decrease by 12°F, from 57°F to 45°F, rarely falling below 35°F or exceeding 67°F.
Daily low temperatures decrease by 6°F, from 33°F to 27°F, rarely falling below 18°F or exceeding 41°F.
For reference, on August 3, the hottest day of the year, temperatures in Portola typically range from 52°F to 83°F, while on January 2, the coldest day of the year, they range from 24°F to 41°F.
Average High and Low Temperature in November
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on November. 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 November
The month of November in Portola experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 44% to 55%.
The clearest day of the month is November 1, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on March 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.
Cloud Cover Categories in November
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Portola, the chance of a wet day over the course of November is very rapidly increasing, starting the month at 20% and ending it at 31%.
For reference, the year's highest daily chance of a wet day is 35% on March 1, and its lowest chance is 2% on August 13.
Over the course of November in Portola, the chance of a day with only rain increases from 16% to 18%, the chance of a day with mixed snow and rain increases from 3% to 10%, and the chance of a day with only snow remains an essentially constant 2% throughout.
Probability of Precipitation in November
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 November in Portola is rapidly increasing, starting the month at 2.4 inches, when it rarely exceeds 5.0 inches or falls below 0.3 inches, and ending the month at 3.9 inches, when it rarely exceeds 7.8 inches or falls below 0.6 inches.
Average Monthly Rainfall in November
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during November in Portola is gradually increasing, starting the month at 0.2 inches, when it rarely exceeds 0.6 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.6 inches.
Average Monthly Liquid-Equivalent Snowfall in November
Over the course of November in Portola, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 54 minutes, implying an average daily decrease of 1 minute, 52 seconds, and weekly decrease of 13 minutes, 2 seconds.
The shortest day of the month is November 30, with 9 hours, 35 minutes of daylight and the longest day is November 1, with 10 hours, 29 minutes of daylight.
Hours of Daylight and Twilight in November
The latest sunrise of the month in Portola is 7:33 AM on November 3 and the earliest sunrise is 59 minutes earlier at 6:34 AM on November 4.
The latest sunset is 5:59 PM on November 1 and the earliest sunset is 1 hour, 22 minutes earlier at 4:37 PM on November 30.
Daylight saving time (DST) ends at 1:00 AM on November 4, 2018, shifting sunrise and sunset to be an hour earlier.
For reference, on June 21, the longest day of the year, the Sun rises at 5:33 AM and sets 14 hours, 60 minutes later, at 8:33 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 9 hours, 21 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in November
The chance that a given day will be muggy in Portola is essentially constant during November, remaining around 0% throughout.
Humidity Comfort Levels in November
The average hourly wind speed in Portola is gradually increasing during November, increasing from 4.9 miles per hour to 5.5 miles per hour over the course of the month.
For reference, on March 21, the windiest day of the year, the daily average wind speed is 5.7 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 4.4 miles per hour.
Average Wind Speed in November
Wind Direction in November
The growing season in Portola typically lasts for 4.5 months (136 days), from around May 28 to around October 12, rarely starting before May 3 or after June 20, and rarely ending before September 16 or after November 3.
The month of November in Portola is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season decreasing from 12% to -0% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in November
The average accumulated growing degree days in Portola are essentially constant during November, remaining within 13°F of 2,124°F throughout.
Growing Degree Days in November
The average daily incident shortwave solar energy in Portola is decreasing during November, falling by 1.1 kWh, from 3.4 kWh to 2.3 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in November
For the purposes of this report, the geographical coordinates of Portola are 39.810 deg latitude, -120.469 deg longitude, and 5,105 ft elevation.
The topography within 2 miles of Portola contains very significant variations in elevation, with a maximum elevation change of 928 feet and an average elevation above sea level of 5,067 feet. Within 10 miles contains very significant variations in elevation (3,376 feet). Within 50 miles also contains extreme variations in elevation (10,062 feet).
The area within 2 miles of Portola is covered by shrubs (68%) and trees (31%), within 10 miles by trees (52%) and shrubs (33%), and within 50 miles by trees (51%) and shrubs (42%).
This report illustrates the typical weather in Portola 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 Portola.
For each station, the records are corrected for the elevation difference between that station and Portola 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 Portola is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Portola and a given station.
The stations contributing to this reconstruction are: Reno Stead Airport (40%, 53 kilometers, east); Truckee Tahoe Airport (29%, 62 kilometers, southeast); and Blue Canyon-Nyack Airport (31%, 63 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .