This report describes the typical weather at the La Aurora International Airport (Guatemala City) weather station over the course of an average July. It is based on the historical records from 1996 to 2012. Earlier records are either unavailable or unreliable.
Guatemala City has a mild temperate climate with dry winters and warm summers. The area within 25 mi of this station is covered by forests (45%), croplands (40%), grasslands (10%), and built-up areas (3%).
The month of July is characterized by essentially constant daily high temperatures, with daily highs around 76°F throughout the month, exceeding 79°F or dropping below 72°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 31 with 12:46 hours of daylight; the longest day is July 1 with 12:59 hours of daylight.
The earliest sunrise is at 5:37am on July 1; the latest sunset is at 6:36pm on July 11; the latest sunrise is at 5:45am on July 31; the earliest sunset is at 6:31pm on July 31.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 86% (mostly 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 5% of the time, partly cloudy 24% of the time, and mostly cloudy or overcast 61% 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 80% of days. Precipitation is least likely around July 28, occurring in 74% of days.
Throughout July, the most common forms of precipitation are thunderstorms, moderate rain, and drizzle.
Thunderstorms are the most severe precipitation observed during 57% of those days with precipitation. They are most likely around July 1, when it is observed during 46% of all days.
Moderate rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around July 19, when it is observed during 12% of all days.
Drizzle is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around July 31, when it is observed during 11% 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 55% (mildly humid) to 96% (very humid) over the course of a typical July, rarely dropping below 45% (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 1, rising above 94% (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 57°F (comfortable) to 64°F (mildy humid) and is rarely below 53°F (very comfortable) or above 66°F (muggy).
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 2 mph to 18 mph (light air to fresh breeze), rarely exceeding 24 mph (strong breeze).
The highest average wind speed of 12 mph (gentle breeze) occurs around July 27, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around July 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).