This report describes the typical weather at the Billings Logan International Airport (Billings, Montana, United States) weather station over the course of an average July. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Billings, Montana has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (82%) and shrublands (14%).
The month of July is characterized by gradually rising daily high temperatures, with daily highs ranging from 83°F to 87°F over the course of the month, exceeding 97°F or dropping below 72°F only one day in ten.
Over the course of July, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 52 minutes, implying an average day-over-day decrease of 1.7 minutes.
The shortest day of the month is July 31 with 14:47 hours of daylight; the longest day is July 1 with 15:40 hours of daylight.
The earliest sunrise is at 5:28am on July 1; the latest sunset is at 9:08pm on July 1; the latest sunrise is at 5:56am on July 31; the earliest sunset is at 8:44pm on July 31.
Daylight savings time is observed in 2012 but it neither starts nor ends in July, so the entire month is in daylight time.
The median cloud cover ranges from 36% (mostly clear) to 46% (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 July 16, a representative day, the sky is clear or mostly clear 48% of the time, partly cloudy 23% of the time, and mostly cloudy or overcast 26% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around July 1, occurring in 49% of days. Precipitation is least likely around July 31, occurring in 41% of days.
Throughout July, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 60% of those days with precipitation. They are most likely around July 5, when it is observed during 28% of all days.
Light rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around July 1, when it is observed during 14% of all days.
Moderate rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around July 1, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 24% (dry) to 75% (humid) over the course of a typical July, rarely dropping below 13% (very dry) and reaching as high as 98% (very humid).
The air is driest around July 31, at which time the relative humidity drops below 29% (dry) three days out of four; it is most humid around July 1, rising above 64% (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 July, the dew point typically varies from 40°F (dry) to 53°F (very comfortable) and is rarely below 30°F (dry) or above 60°F (comfortable).
The time of the month between July 1 and July 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of July typical wind speeds vary from 1 mph to 17 mph (light air to moderate breeze), rarely exceeding 24 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around July 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around July 16, at which time the average daily maximum wind speed is 16 mph (moderate breeze).