This report describes the typical weather at the Lackland Air Force Base (San Antonio, Texas, United States) weather station over the course of an average November 23. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
San Antonio, Texas has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by grasslands (53%), croplands (24%), forests (13%), and built-up areas (9%).
The temperature typically varies from 52°F to 70°F and is rarely below 38°F or above 80°F.
The coolest hours of the day are from midnight to 9am with the coldest at 7am, at which time the temperature is below 61°F three days out of four.
The warmest hours of the day are from noon to 6pm with the hottest at 3pm, at which time the temperature is above 65°F three days out of four.
The day has gained half its heat by 10am and lost it again by 8pm.
On November 23 the Sun rises at 7:05am and sets at 5:35pm.
Solar noon is at 12:20pm.
For reference, on the longest day of the year the Sun rises at 6:35am and sets at 8:36pm, while on the shortest day of the year it rises at 7:24am and sets at 5:40pm.
Astronomical twilight begins and ends 83 minutes before sunrise and after sunset at 5:42am and 6:59pm, respectively.
Nautical twilight begins and ends 54 minutes before sunrise and after sunset at 6:10am and 6:30pm, respectively.
Civil twilight begins and ends 26 minutes before sunrise and after sunset at 6:39am and 6:01pm, respectively.
Solar twilight begins and ends 34 minutes after sunrise and before sunset at 7:39am and 5:01pm, respectively.
The median cloud cover ranges from 56% (partly cloudy) to 84% (mostly cloudy).
At 9pm, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 52% of the time, and overcast or mostly cloudy 44% of the time.
At 8am, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 66% of the time, and clear or mostly clear 30% of the time.
The sky is typically clearing in earnest by 4pm.
The clouds have typically started forming in earnest by 3am.
There is a 37% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.011". Among only those days for which there is at least some measured precipitation, the average is 0.329" and the total rarely exceeds 0.331".
When precipitation does occur it is most often in the form of slight rain (43% of days with precipitation have at worst slight rain), drizzle (27%), moderate rain (14%), and thunderstorms (13%).
Precipitation is most likely around 7am and least likely around 8pm.
Either snow is exceptionally unlikely to fall at this location on November 23 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 52% (mildly humid) to 85% (humid), rarely dropping below 26% (dry), or exceeding 100% (very humid).
The air is driest at 3pm, at which time the relative humidity is less than 66% (mildly humid) three days out of four; it is most humid at 6am, exceeding 78% (humid) three days out of four.
The dew point ranges from 47°F to 49°F with an average of 48°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 5 mph to 9 mph (light breeze to gentle breeze) over the course of the day.
The peak sustained wind speed typically occurs around 1pm and is rarely outside the range 4 mph to 14 mph (light breeze to moderate breeze).
The wind is most calm around 7am, rarely exceeding 11 mph (gentle breeze).
The wind is most often out of the north (17% of the time), south (15% of the time), north east (12% of the time), and south east (12% of the time). The wind is least often out of the west (3% of the time) and south west (3% of the time).