This report describes the typical weather at the Eduardo Gomes International Airport (Manaus, Brazil) weather station over the course of an average July. It is based on the historical records from 1979 to 2012. Earlier records are either unavailable or unreliable.
Manaus has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by forests (41%), croplands (39%), lakes and rivers (18%), and grasslands (2%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 91°F throughout the month, exceeding 95°F or dropping below 85°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 18 with 11:57 hours of daylight; the longest day is July 31 with 11:59 hours of daylight.
The earliest sunrise is at 6:06am on July 1; the latest sunset is at 6:06pm on July 25; the latest sunrise is at 6:08am on July 19; the earliest sunset is at 6:03pm on July 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 56% (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 27% of the time, partly cloudy 30% of the time, and mostly cloudy or overcast 27% 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 45% of days. Precipitation is least likely around July 29, occurring in 38% of days.
Throughout July, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 65% of those days with precipitation. They are most likely around July 1, when it is observed during 29% of all days.
Moderate rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around July 1, when it is observed during 9% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around July 1, when it is observed during 7% 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 52% (mildly humid) to 99% (very humid) over the course of a typical July, rarely dropping below 40% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 31, at which time the relative humidity drops below 58% (mildly humid) three days out of four; it is most humid around July 3, rising above 99% (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 69°F (muggy) to 76°F (oppressive) and is rarely below 65°F (mildy humid) or above 80°F (very oppressive).
Over the course of July typical wind speeds vary from 0 mph to 11 mph (calm to gentle breeze), rarely exceeding 15 mph (moderate breeze).
The highest average wind speed of 3 mph (light air) occurs around July 28, at which time the average daily maximum wind speed is 10 mph (gentle breeze).
The lowest average wind speed of 3 mph (light air) occurs around July 3, at which time the average daily maximum wind speed is 10 mph (gentle breeze).