This report describes the typical weather at the Port Moresby/Jackson International Airport (Port Moresby, Papua New Guinea) weather station over the course of an average July. It is based on the historical records from 2006 to 2012. Earlier records are either unavailable or unreliable.
Port Moresby has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (39%), grasslands (28%), forests (21%), and floodplains (12%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 84°F throughout the month, exceeding 87°F or dropping below 81°F only one day in ten.
Over the course of July, the length of the day is essentially constant. The shortest day of the month is July 5 with 11:35 hours of daylight; the longest day is July 29 with 11:42 hours of daylight.
The earliest sunrise is at 6:27am on July 31; the latest sunset is at 6:09pm on July 29; the latest sunrise is at 6:29am on July 19; the earliest sunset is at 6:02pm on July 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 73% (partly cloudy) and does not vary substantially over the course of the month.
On July 16, a representative day, the sky is clear or mostly clear 13% of the time, partly cloudy 27% of the time, and mostly cloudy or overcast 42% 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 23% of days. Precipitation is least likely around July 23, occurring in 18% of days.
Throughout July, the most common forms of precipitation are light rain, drizzle, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around July 29, when it is observed during 7% of all days.
Drizzle is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around July 5, when it is observed during 6% of all days.
Thunderstorms are the most severe precipitation observed during 22% of those days with precipitation. They are most likely around July 1, when it is observed during 6% of all days.
Moderate rain is the most severe precipitation observed during 18% of those days with precipitation. It is most likely around July 1, when it is observed during 4% 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 64% (mildly humid) to 93% (very humid) over the course of a typical July, rarely dropping below 54% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around July 20, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around July 1, rising above 89% (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 July, the dew point typically varies from 68°F (muggy) to 74°F (very muggy) and is rarely below 63°F (mildy humid) or above 77°F (oppressive).
Over the course of July typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around July 29, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around July 6, at which time the average daily maximum wind speed is 14 mph (moderate breeze).