This report describes the typical weather at the Catalina Airport (Avalon/Santa Catalina Island, California, United States) weather station over the course of an average October. It is based on the historical records from 2000 to 2012. Earlier records are either unavailable or unreliable.
Avalon/Santa Catalina Island, California has a cold desert climate. The area within 25 mi of this station is covered by oceans and seas (96%) and shrublands (4%).
The month of October is characterized by falling daily high temperatures, with daily highs decreasing from 72°F to 67°F over the course of the month, exceeding 84°F or dropping below 56°F only one day in ten.
Over the course of October, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 59 minutes, implying an average day-over-day decrease of 1.9 minutes.
The shortest day of the month is October 31 with 10:50 hours of daylight; the longest day is October 1 with 11:49 hours of daylight.
The earliest sunrise is at 6:49am on October 1; the latest sunset is at 6:37pm on October 1; the latest sunrise is at 7:12am on October 31; the earliest sunset is at 6:02pm on October 31.
Daylight savings 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 16% (mostly 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 63% of the time, partly cloudy 2% of the time, and mostly cloudy or overcast 33% 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 16% of days. Precipitation is least likely around October 1, occurring in 10% 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 58% of those days with precipitation. It is most likely around October 30, when it is observed during 9% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around October 30, when it is observed during 3% of all days.
Heavy rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around October 31, 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 42% (comfortable) to 82% (humid) over the course of a typical October, rarely dropping below 14% (very dry) and reaching as high as 100% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 61% (mildly humid) three days out of four; it is most humid around October 10, rising above 71% (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 35°F (dry) to 54°F (very comfortable) and is rarely below 19°F (dry) or above 58°F (comfortable).
The time of the month between October 1 and October 29 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of October typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 17 mph (moderate breeze).
The highest average wind speed of 7 mph (light breeze) occurs around October 31, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around October 1, at which time the average daily maximum wind speed is 12 mph (gentle breeze).