This report describes the typical weather at the Austin Straubel International Airport (Green Bay, Wisconsin, United States) weather station over the course of an average September 9. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.

Green Bay, Wisconsin has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (47%), croplands (41%), oceans and seas (8%), and built-up areas (3%).

The temperature typically varies from 55°F to 71°F and is rarely below 44°F or above 81°F.

Temperature

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Average hourly temperature (black) with percentil bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The coolest hours of the day are from 1am to 8am with the coldest at 6am, at which time the temperature is below 60°F three days out of four.

The warmest hours of the day are from 11am to 7pm with the hottest at 3pm, at which time the temperature is above 66°F three days out of four.

The day has gained half its heat by 10am and lost it again by 8pm.

Temperature Bands

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The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

On September 9 the Sun rises at 6:25am and sets at 7:13pm.

Solar noon is at 12:49pm.

For reference, on the longest day of the year the Sun rises at 5:07am and sets at 8:41pm, while on the shortest day of the year it rises at 7:26am and sets at 4:15pm.

Astronomical twilight begins and ends 101 minutes before sunrise and after sunset at 4:43am and 8:54pm, respectively.

Nautical twilight begins and ends 64 minutes before sunrise and after sunset at 5:20am and 8:18pm, respectively.

Civil twilight begins and ends 29 minutes before sunrise and after sunset at 5:55am and 7:43pm, respectively.

Solar twilight begins and ends 38 minutes after sunrise and before sunset at 7:03am and 6:35pm, respectively.

Solar Elevation

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Elevation of the Sun above (positive) or below (negative) the horizon (black line). Yellow and gray fills indicate day and night, respectively. Light gray lines are the corresponding curves for the winter and summer equinoxes.

The median cloud cover ranges from 29% (mostly clear) to 59% (partly cloudy).

At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.

At 1pm, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 56% of the time, and clear or mostly clear 44% of the time.

The sky is typically clearing in earnest by 7pm.

The clouds have typically started forming in earnest by 7am.

Median Cloud Cover

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Median hourly cloud coverage fraction (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

There is a 44% chance that precipitation will be observed at some point during the day.

The average measured liquid-equivalent quantity of precipitation is 0.091". Among only those days for which there is at least some measured precipitation, the average is 0.288" and the total rarely exceeds 0.681".

Probability of Precipitation

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The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

When precipitation does occur it is most often in the form of slight rain (35% of days with precipitation have at worst slight rain), moderate rain (34%), and thunderstorms (23%).

Precipitation is most likely around 7am and least likely around 1pm.

Types of Precipitation

Relative frequency of various types of precipitation over the course of a typical September 9.

Either snow is exceptionally unlikely to fall at this location on September 9 or this station does not reliably report precipitation types.

The relative humidity typically ranges from 59% (mildly humid) to 89% (very humid), rarely dropping below 41% (comfortable), or exceeding 98% (very humid).

The air is driest at 3pm, at which time the relative humidity is less than 70% (mildly humid) three days out of four; it is most humid at 5am, exceeding 85% (very humid) three days out of four.

Relative Humidity

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Average hourly humidity (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

The dew point ranges from 52°F to 56°F with an average of 54°F.

For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.

Dew Point

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Average hourly dew point (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Sustained wind speeds typically vary from 6 mph to 11 mph (light breeze to gentle breeze) over the course of the day.

The peak sustained wind speed typically occurs around 2pm and is rarely outside the range 5 mph to 17 mph (light breeze to moderate breeze).

The wind is most calm around 5am, rarely exceeding 11 mph (gentle breeze).

Wind Speed

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Average hourly wind speed (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

The wind is most often out of the south west (17% of the time), south (16% of the time), west (14% of the time), north (11% of the time), and north west (10% of the time).

Wind Directions

The fraction of time spent with the wind blowing from the various directions over the entire day. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Wind Directions Over Day

The fraction of time spent with the wind blowing from the various directions on an hourly basis. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.