This report describes the typical weather at the Auckland Airport (Auckland, New Zealand) weather station over the course of an average May. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.
Auckland has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (47%), oceans and seas (28%), built-up areas (10%), lakes and rivers (10%), and forests (5%).
The month of May is characterized by falling daily high temperatures, with daily highs decreasing from 65°F to 61°F over the course of the month, exceeding 69°F or dropping below 57°F only one day in ten.
Over the course of May, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 47 minutes, implying an average day-over-day decrease of 1.5 minutes.
The shortest day of the month is May 31 with 9:48 hours of daylight; the longest day is May 1 with 10:35 hours of daylight.
The earliest sunrise is at 7:00am on May 1; the latest sunset is at 5:35pm on May 1; the latest sunrise is at 7:25am on May 31; the earliest sunset is at 5:12pm on May 30.
Daylight savings time is observed in 2012 but it neither starts nor ends in May, so the entire month is in standard time.
The median cloud cover is 64% (partly cloudy) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 23% of the time, partly cloudy 24% of the time, and mostly cloudy or overcast 36% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 30, occurring in 63% of days. Precipitation is least likely around May 1, occurring in 58% of days.
Throughout May, 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 May 31, when it is observed during 47% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around May 1, when it is observed during 9% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 95% (very humid) over the course of a typical May, rarely dropping below 54% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around May 1, at which time the relative humidity drops below 71% (humid) three days out of four; it is most humid around May 27, 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 May, the dew point typically varies from 46°F (dry) to 57°F (comfortable) and is rarely below 39°F (dry) or above 63°F (mildy humid).
The time of the month between May 1 and May 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of May typical wind speeds vary from 2 mph to 17 mph (light air to moderate breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around May 24, 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 May 1, at which time the average daily maximum wind speed is 16 mph (moderate breeze).