This report describes the typical weather at the General Rafael Buelna International Airport (Mazatlán, Mexico) weather station over the course of an average January. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.
Mazatlán has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by forests (54%), oceans and seas (40%), and lakes and rivers (3%).
The month of January is characterized by essentially constant daily high temperatures, with daily highs around 80°F throughout the month, exceeding 85°F or dropping below 74°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 2 with 10:44 hours of daylight; the longest day is January 31 with 11:07 hours of daylight.
The earliest sunrise is at 6:45am on January 31; the latest sunset is at 5:52pm on January 31; the latest sunrise is at 6:49am on January 17; the earliest sunset is at 5:31pm on January 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in January, so the entire month is in standard time.
The median cloud cover is 28% (mostly clear) and does not vary substantially over the course of the month.
On January 16, a representative day, the sky is clear or mostly clear 38% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 21% of the time.
The average probability that some form of precipitation will be observed in a given day is 7%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light rain, moderate rain, drizzle, and thunderstorms.
Light rain is the most severe precipitation observed during 38% of those days with precipitation. It is most likely around January 1, when it is observed during 4% of all days.
Moderate rain is the most severe precipitation observed during 22% of those days with precipitation. It is most likely around January 6, when it is observed during 2% of all days.
Drizzle is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around January 17, when it is observed during 2% of all days.
Thunderstorms are the most severe precipitation observed during 16% of those days with precipitation. They are most likely around January 17, when it is observed during 1% of all days.
Either snow is exceptionally unlikely to fall at this location in January or this station does not reliably report precipitation types.
The relative humidity typically ranges from 42% (comfortable) to 88% (very humid) over the course of a typical January, rarely dropping below 31% (comfortable) and reaching as high as 95% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 48% (comfortable) three days out of four; it is most humid around January 1, rising above 83% (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 January, the dew point typically varies from 47°F (dry) to 61°F (comfortable) and is rarely below 40°F (dry) or above 66°F (muggy).
The time of the month between January 1 and January 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of January typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 5 mph (light breeze) occurs around January 27, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around January 1, at which time the average daily maximum wind speed is 11 mph (gentle breeze).