This report describes the typical weather at the Stornoway Airport (Stornoway, United Kingdom) weather station over the course of an average June. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Stornoway has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (68%), croplands (22%), and shrublands (3%).
The month of June is characterized by gradually rising daily high temperatures, with daily highs around 57°F throughout the month, exceeding 64°F or dropping below 50°F only one day in ten.
Over the course of June, the length of the day is essentially constant. The shortest day of the month is June 1 with 17:47 hours of daylight; the longest day is June 20 with 18:17 hours of daylight.
The earliest sunrise is at 4:18am on June 19; the latest sunset is at 10:36pm on June 22; the latest sunrise is at 4:30am on June 1; the earliest sunset is at 10:18pm on June 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in June, so the entire month is in daylight time.
The median cloud cover ranges from 78% (partly cloudy) to 86% (mostly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 8% from the start to the end of the month.
On June 15, a representative day, the sky is clear or mostly clear 21% of the time, partly cloudy 23% of the time, and mostly cloudy or overcast 49% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around June 30, occurring in 78% of days. Precipitation is least likely around June 2, occurring in 74% of days.
Throughout June, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 73% of those days with precipitation. It is most likely around June 30, when it is observed during 57% of all days.
Light rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around June 29, when it is observed during 13% of all days.
Either snow is exceptionally unlikely to fall at this location in June or this station does not reliably report precipitation types.
The relative humidity typically ranges from 67% (mildly humid) to 95% (very humid) over the course of a typical June, rarely dropping below 53% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around June 1, at which time the relative humidity drops below 75% (humid) three days out of four; it is most humid around June 29, rising above 92% (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 June, the dew point typically varies from 41°F (dry) to 52°F (very comfortable) and is rarely below 35°F (dry) or above 57°F (comfortable).
Over the course of June typical wind speeds vary from 4 mph to 19 mph (light breeze to fresh breeze), rarely exceeding 27 mph (strong breeze).
The highest average wind speed of 12 mph (moderate breeze) occurs around June 4, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around June 30, at which time the average daily maximum wind speed is 17 mph (moderate breeze).