This report describes the typical weather at the Mason City Municipal Airport (Mason City, Iowa, United States) weather station over the course of an average November 24. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Mason City, Iowa has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (99%).
The temperature typically varies from 25°F to 35°F and is rarely below 12°F or above 51°F.
The coolest hours of the day are from 1am to 9am with the coldest at 7am, at which time the temperature is below 32°F three days out of four.
The warmest hours of the day are from noon to 5pm with the hottest at 2pm, at which time the temperature is above 28°F three days out of four.
The day has gained half its heat by 11am and lost it again by 6pm.
On November 24 the Sun rises at 7:17am and sets at 4:42pm.
Solar noon is at 12:00pm.
For reference, on the longest day of the year the Sun rises at 5:33am and sets at 8:56pm, while on the shortest day of the year it rises at 7:41am and sets at 4:41pm.
Astronomical twilight begins and ends 100 minutes before sunrise and after sunset at 5:37am and 6:22pm, respectively.
Nautical twilight begins and ends 66 minutes before sunrise and after sunset at 6:11am and 5:49pm, respectively.
Civil twilight begins and ends 31 minutes before sunrise and after sunset at 6:46am and 5:13pm, respectively.
Solar twilight begins and ends 44 minutes after sunrise and before sunset at 8:02am and 3:57pm, respectively.
The median cloud cover ranges from 71% (partly cloudy) to 89% (mostly cloudy).
At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 48% of the time, and overcast or mostly cloudy 52% of the time.
At noon, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 68% of the time, and clear or mostly clear 32% of the time.
The sky is typically clearing in earnest by 8pm.
The clouds have typically started forming in earnest by 7am.
There is a 42% 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 0.142" and the total rarely exceeds 0.242".
When precipitation does occur it is most often in the form of slight snow (50% of days with precipitation have at worst slight snow), slight rain (17%), moderate snow (13%), and drizzle (8%).
Precipitation is observed with more or less equal probability throughout the day.
There is a 20% chance that there will be snow on the ground. The average snow depth is 2.9". The snow depth is deeper than 4.4" one year in four and deeper than 5.7" one year in ten.
The relative humidity typically ranges from 68% (mildly humid) to 84% (humid), rarely dropping below 47% (comfortable), or exceeding 95% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 81% (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 21°F to 25°F with an average of 23°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 11 mph to 15 mph (gentle breeze to moderate breeze) over the course of the day.
The peak sustained wind speed typically occurs around 2pm and is rarely outside the range 7 mph to 22 mph (light breeze to fresh breeze).
The wind is most calm around midnight, rarely exceeding 19 mph (fresh breeze).
The wind is most often out of the north west (21% of the time), south (17% of the time), west (16% of the time), south east (13% of the time), and north (10% of the time). The wind is least often out of the north east (5% of the time).