This report describes the typical weather at the Grand Rapids (Grand Rapids, Minnesota, United States) weather station over the course of an average January. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
Grand Rapids, Minnesota has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (81%), forests (14%), and lakes and rivers (4%).
The month of January is characterized by essentially constant daily high temperatures, with daily highs around 19°F throughout the month, exceeding 35°F or dropping below 1°F only one day in ten.
Over the course of January, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 58 minutes, implying an average day-over-day increase of 1.9 minutes.
The shortest day of the month is January 1 with 8:35 hours of daylight; the longest day is January 31 with 9:33 hours of daylight.
The earliest sunrise is at 7:41am on January 31; the latest sunset is at 5:14pm on January 31; the latest sunrise is at 8:01am on January 3; the earliest sunset is at 4:35pm 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 ranges from 77% (partly cloudy) to 87% (mostly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 10% from the start to the end of the month.
On January 31, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 38% of the time, and overcast or mostly cloudy 50% of the time.
On January 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 59% of the time, and clear or mostly clear 31% of the time.
The average probability that some form of precipitation will be observed in a given day is 2%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light snow and moderate snow.
Light snow is the most severe precipitation observed during 67% of those days with precipitation. It is most likely around January 31, when it is observed during 2% of all days.
Moderate snow is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around January 1, when it is observed during 1% of all days.
The likelihood of snow falling is highest around January 31, occurring in 2% of days.
Either snow rarely accumulates at this location in January or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 54% (mildly humid) to 83% (humid) over the course of a typical January, rarely dropping below 36% (comfortable), or exceeding 93% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around January 1, rising above 78% (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 -6°F (dry) to 11°F (dry) and is rarely below -27°F (dry) or above 27°F (dry).
Over the course of January typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around January 19, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around January 5, at which time the average daily maximum wind speed is 13 mph (moderate breeze).