This report describes the typical weather at the Palm Springs International Airport (Palm Springs, California, United States) weather station over the course of an average December. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Palm Springs, California has a hot desert climate. The area within 25 mi of this station is covered by shrublands (70%) and forests (27%).
The month of December is characterized by falling daily high temperatures, with daily highs ranging from 72°F to 67°F over the course of the month, exceeding 81°F or dropping below 58°F only one day in ten.
Over the course of December, the length of the day is essentially constant. The shortest day of the month is December 22 with 9:54 hours of daylight; the longest day is December 1 with 10:04 hours of daylight.
The earliest sunrise is at 6:33am on December 1; the latest sunset is at 4:48pm on December 31; the latest sunrise is at 6:51am on December 31; the earliest sunset is at 4:37pm on December 5.
Daylight saving time is observed in 2012 but it neither starts nor ends in December, so the entire month is in standard time.
The median cloud cover ranges from 5% (clear) to 11% (mostly clear). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 6% from the start to the end of the month.
On December 16, a representative day, the sky is clear or mostly clear 54% of the time, partly cloudy 9% of the time, and mostly cloudy or overcast 18% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around December 27, occurring in 12% of days. Precipitation is least likely around December 2, occurring in 8% of days.
Throughout December, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 50% of those days with precipitation. It is most likely around December 29, when it is observed during 6% of all days.
Moderate rain is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around December 23, when it is observed during 5% of all days.
Either snow is exceptionally unlikely to fall at this location in December or this station does not reliably report precipitation types.
The relative humidity typically ranges from 57% (mildly humid) to 81% (humid) over the course of a typical December, rarely dropping below 12% (very dry) and reaching as high as 100% (very humid).
The air is driest around December 1, at which time the relative humidity drops below 100% (very humid) three days out of four; it is most humid around December 21, rising above 63% (mildly 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 December, the dew point typically varies from 24°F (dry) to 37°F (dry) and is rarely below 7°F (dry) or above 48°F (dry).
Over the course of December typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around December 3, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around December 31, at which time the average daily maximum wind speed is 11 mph (gentle breeze).