This report describes the typical weather at the Brown Municipal Airport (San Diego, California, United States) weather station over the course of an average February. It is based on the historical records from 1984 to 2012. Earlier records are either unavailable or unreliable.
San Diego, California has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (60%), oceans and seas (27%), and built-up areas (11%).
The month of February is characterized by essentially constant daily high temperatures, with daily highs around 65°F throughout the month, exceeding 77°F or dropping below 57°F only one day in ten.
Over the course of February, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 50 minutes, implying an average day-over-day increase of 1.7 minutes.
The shortest day of the month is February 1 with 10:39 hours of daylight; the longest day is February 29 with 11:29 hours of daylight.
The earliest sunrise is at 6:16am on February 29; the latest sunset is at 5:45pm on February 29; the latest sunrise is at 6:42am on February 2; the earliest sunset is at 5:21pm on February 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in February, so the entire month is in standard time.
The median cloud cover ranges from 19% (mostly clear) to 31% (mostly clear). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 13% from the start to the end of the month.
On February 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 53% of the time, and overcast or mostly cloudy 29% of the time.
On February 29, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 39% of the time, and clear or mostly clear 45% of the time.
The average probability that some form of precipitation will be observed in a given day is 24%, with little variation over the course of the month.
Throughout February, the most common forms of precipitation are light rain, moderate rain, and heavy rain.
Light rain is the most severe precipitation observed during 46% of those days with precipitation. It is most likely around February 19, when it is observed during 11% of all days.
Moderate rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around February 1, when it is observed during 8% of all days.
Heavy rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around February 24, when it is observed during 5% of all days.
Either snow is exceptionally unlikely to fall at this location in February or this station does not reliably report precipitation types.
The relative humidity typically ranges from 42% (comfortable) to 92% (very humid) over the course of a typical February, rarely dropping below 15% (dry) and reaching as high as 100% (very humid).
The air is driest around February 1, at which time the relative humidity drops below 57% (mildly humid) three days out of four; it is most humid around February 26, rising above 89% (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 typical February, the dew point typically varies from 35°F (dry) to 50°F (dry) and is rarely below 18°F (dry) or above 55°F (very comfortable).
Over the course of February typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around February 12, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around February 28, at which time the average daily maximum wind speed is 13 mph (moderate breeze).