This report describes the typical weather at the Chiang Rai International Airport (Chiang Rai, Thailand) weather station over the course of an average January. It is based on the historical records from 2005 to 2012. Earlier records are either unavailable or unreliable.
Chiang Rai has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by grasslands (47%), forests (38%), and croplands (13%).
The month of January is characterized by gradually rising daily high temperatures, with daily highs around 83°F throughout the month, exceeding 87°F or dropping below 77°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 10:57 hours of daylight; the longest day is January 31 with 11:15 hours of daylight.
The earliest sunrise is at 6:55am on January 1; the latest sunset is at 6:11pm on January 31; the latest sunrise is at 6:59am on January 22; the earliest sunset is at 5:52pm on January 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 42% (partly cloudy) to 51% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 9% from the start to the end of the month.
On January 16, a representative day, the sky is clear or mostly clear 23% of the time, partly cloudy 8% of the time, and mostly cloudy or overcast 10% of the time.
The average probability that some form of precipitation will be observed in a given day is 5%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 40% of those days with precipitation. It is most likely around January 21, when it is observed during 2% of all days.
Thunderstorms are the most severe precipitation observed during 33% of those days with precipitation. They are most likely around January 4, when it is observed during 2% of all days.
Light rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around January 5, when it is observed during 2% 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 38% (comfortable) to 95% (very humid) over the course of a typical January, rarely dropping below 28% (dry) and reaching as high as 100% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 42% (comfortable) three days out of four; it is most humid around January 1, rising above 94% (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 January, the dew point typically varies from 53°F (very comfortable) to 62°F (mildy humid) and is rarely below 47°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 6 mph (calm to light breeze), rarely exceeding 10 mph (gentle breeze).
The highest average wind speed of 2 mph (light air) occurs around January 23, at which time the average daily maximum wind speed is 6 mph (light breeze).
The lowest average wind speed of 2 mph (light air) occurs around January 14, at which time the average daily maximum wind speed is 6 mph (light breeze).