This report describes the typical weather at the Oroville Municipal Airport (Oroville, California, United States) weather station over the course of an average October. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Oroville, California has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by grasslands (41%), forests (29%), and croplands (28%).
The month of October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 82°F to 69°F over the course of the month, exceeding 91°F or dropping below 61°F only one day in ten.
Over the course of October, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:14 hours, implying an average day-over-day decrease of 2.4 minutes.
The shortest day of the month is October 31 with 10:31 hours of daylight; the longest day is October 1 with 11:45 hours of daylight.
The earliest sunrise is at 7:03am on October 1; the latest sunset is at 6:48pm on October 1; the latest sunrise is at 7:34am on October 31; the earliest sunset is at 6:05pm on October 31.
Daylight saving time is observed in 2012 but it neither starts nor ends in October, so the entire month is in daylight time.
The median cloud cover is 1% (clear) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 82% of the time, partly cloudy 2% of the time, and mostly cloudy or overcast 14% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 31, occurring in 20% of days. Precipitation is least likely around October 1, occurring in 9% of days.
Throughout October, the most common forms of precipitation are light rain, moderate rain, and heavy rain.
Light rain is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around October 31, when it is observed during 9% of all days.
Moderate rain is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around October 31, when it is observed during 7% of all days.
Heavy rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around October 30, when it is observed during 3% of all days.
Either snow is exceptionally unlikely to fall at this location in October or this station does not reliably report precipitation types.
The relative humidity typically ranges from 29% (dry) to 86% (very humid) over the course of a typical October, rarely dropping below 18% (dry) and reaching as high as 97% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 36% (comfortable) three days out of four; it is most humid around October 31, rising above 81% (humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical October, the dew point typically varies from 39°F (dry) to 52°F (very comfortable) and is rarely below 28°F (dry) or above 57°F (comfortable).
Over the course of October typical wind speeds vary from 0 mph to 10 mph (calm to gentle breeze), rarely exceeding 18 mph (moderate breeze).
The highest average wind speed of 5 mph (light breeze) occurs around October 9, at which time the average daily maximum wind speed is 10 mph (gentle breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around October 27, at which time the average daily maximum wind speed is 9 mph (gentle breeze).