This report describes the typical weather at the Komatsu Airport (Komatsu, Japan) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Komatsu has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (43%), forests (32%), croplands (19%), built-up areas (3%), and grasslands (3%).
Over the course of a year, the temperature typically varies from 32°F to 87°F and is rarely below 27°F or above 93°F.
The warm season lasts from June 28 to September 19 with an average daily high temperature above 78°F. The hottest day of the year is August 7, with an average high of 87°F and low of 74°F.
The cold season lasts from December 10 to March 18 with an average daily high temperature below 51°F. The coldest day of the year is January 30, with an average low of 32°F and high of 43°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 9:40 hours of daylight; the longest day is June 20 with 14:38 hours of daylight.
The earliest sunrise is at 4:35am on June 12 and the latest sunset is at 7:17pm on June 29. The latest sunrise is at 7:07am on January 5 and the earliest sunset is at 4:39pm on December 4.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 87% (mostly cloudy) and does not vary substantially over the course of the year.
On October 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 15% of the time, and overcast or mostly cloudy 26% of the time.
On January 1, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 37% of the time, and clear or mostly clear 4% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around January 17, occurring in 95% of days. Precipitation is least likely around August 19, occurring in 64% of days.
Over the entire year, the most common forms of precipitation are moderate rain, light rain, thunderstorms, and light snow.
Moderate rain is the most severe precipitation observed during 34% of those days with precipitation. It is most likely around October 23, when it is observed during 33% of all days.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around June 6, when it is observed during 29% of all days.
Thunderstorms are the most severe precipitation observed during 18% of those days with precipitation. They are most likely around December 17, when it is observed during 23% of all days.
Light snow is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around January 25, when it is observed during 29% of all days.
During the warm season, which lasts from June 28 to September 19, there is a 68% 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 moderate rain (38% of days with precipitation have at worst moderate rain), light rain (38%), and thunderstorms (21%).
During the cold season, which lasts from December 10 to March 18, there is a 92% 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 snow (27% of days with precipitation have at worst light snow), moderate rain (21%), thunderstorms (18%), and moderate snow (17%).
The likelihood of snow falling is highest around January 27, occurring in 52% of days. The season in which it is relatively likely for snow to fall spans from December 3 to March 28.
During peak snow season, accumulation at this location on a given day is very unlikely. The chances of there being snow on the ground are highest around February 5, occurring 9% of the time.
The snow is typically at its deepest on February 8, with a median depth of 6.0"; the depth exceeds 14.2" only one year out of ten.
The relative humidity typically ranges from 46% (comfortable) to 93% (very humid) over the course of the year, rarely dropping below 27% (dry) and reaching as high as 100% (very humid).
The air is driest around March 26, at which time the relative humidity drops below 54% (mildly humid) three days out of four; it is most humid around June 29, exceeding 90% (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 23°F (dry) to 74°F (very muggy) and is rarely below 17°F (dry) or above 77°F (oppressive).
There are two periods in the year that are most comfortable: The first is between April 23 and June 17 and the second is between September 23 and November 12. The air feels neither too dry nor too muggy during these periods.
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 9 mph (gentle breeze) occurs around January 14, 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 June 15, at which time the average daily maximum wind speed is 11 mph (gentle breeze).