This report describes the typical weather at the Jack McNamara Field (Crescent City, California, United States) weather station over the course of an average year. It is based on the historical records from 1984 to 2012. Earlier records are either unavailable or unreliable.
Crescent City, California has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (56%) and forests (44%).
Over the course of a year, the temperature typically varies from 42°F to 62°F and is rarely below 35°F or above 67°F.
The warm season lasts from June 26 to October 10 with an average daily high temperature above 61°F. The hottest day of the year is August 26, with an average high of 62°F and low of 53°F.
The cold season lasts from November 24 to April 6 with an average daily high temperature below 55°F. The coldest day of the year is December 23, with an average low of 42°F and high of 53°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 9:09 hours of daylight; the longest day is June 20 with 15:14 hours of daylight.
The earliest sunrise is at 5:41am on June 11 and the latest sunset is at 8:56pm on June 29. The latest sunrise is at 7:52am on November 3 and the earliest sunset is at 4:46pm on December 10.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 68% (partly cloudy) to 90% (mostly cloudy). The sky is cloudiest on February 24 and clearest on June 3. The clearer part of the year begins around May 12. The cloudier part of the year begins around July 22.
On June 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 38% of the time, and overcast or mostly cloudy 44% of the time.
On February 24, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 55% of the time, and clear or mostly clear 27% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 16, occurring in 58% of days. Precipitation is least likely around July 18, occurring in 17% of days.
Over the entire year, the most common forms of precipitation are light rain, moderate rain, heavy rain, and drizzle.
Light rain is the most severe precipitation observed during 48% of those days with precipitation. It is most likely around February 3, when it is observed during 27% of all days.
Moderate rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around December 15, when it is observed during 17% of all days.
Heavy rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around January 3, when it is observed during 10% of all days.
Drizzle is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around August 3, when it is observed during 8% of all days.
During the warm season, which lasts from June 26 to October 10, there is a 21% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (45% of days with precipitation have at worst light rain), drizzle (33%), and moderate rain (14%).
During the cold season, which lasts from November 24 to April 6, there is a 55% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (47% of days with precipitation have at worst light rain), moderate rain (29%), and heavy rain (15%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 61% (mildly humid) to 96% (very humid) over the course of the year, rarely dropping below 42% (comfortable) and reaching as high as 100% (very humid).
The air is driest around December 16, at which time the relative humidity drops below 71% (humid) three days out of four; it is most humid around August 6, exceeding 93% (very 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 year, the dew point typically varies from 36°F (dry) to 55°F (very comfortable) and is rarely below 27°F (dry) or above 58°F (comfortable).
The time of the year between May 15 and November 7 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 17 mph (calm to moderate breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around March 22, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around August 11, at which time the average daily maximum wind speed is 13 mph (moderate breeze).