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Post by nei on Jan 2, 2020 14:40:24 GMT -5
was curious to see if colder days in Ithaca so I made a series of chart. From the Iowa Mesonet, graphed the frequency of clear, partly, cloudy, mostly cloudy and cloudy conditions. separated by midday vs morning since morning is affected by radiational cooling (strongest with clear skies) and midday sun encourages either cloud burn off or more clouds through evaporation. First chart is by frequency, stacked bars. Light blue is clear or mostly clear conditions (up 2/8th of the sky covered by clouds). Yellow partly cloudy (3/8ths or 4/8ths covered with clouds). Light brown mostly cloudy (5/8 to 7/8th covered), dark brown completely cloud covered. Total stacked bar represents how frequent that temperature is. Bins are 2°F wide (e.g. -0.5 to 1.5°F). The more frequent the temperature is, taller the bar. The less frequent temperatures are hard to see, so I made a proportional plot where every bin totals to 100%, and you can see the % of times a sky cover occurs at any temperature. For the really rare temperatures, the chart might not be that accurate as the sample size is too low. First winter mornings  and midday  |
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Post by nei on Jan 2, 2020 14:41:04 GMT -5
summer mornings  middday  |
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Post by nei on Jan 2, 2020 14:49:48 GMT -5
and Chicopee, MA near where I used to live in western MA. Much less cloudy than Ithaca in winter; about 50-50 sun/cloud. Also a bit of a frost hollow, gets colder morning lows. Winter mornings  midday winter. Record is 74°F, but I didn't bother plot very rare temperatures  summer mornings  summer midday  |
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Post by knot on Jan 2, 2020 17:07:57 GMT -5
More clouds with cold weather, by a long shot. And that's the way it should be.
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Post by Speagles84 on Jan 2, 2020 17:23:31 GMT -5
Mostly cold weather, but in winter (like today) it sometime signals a thaw and rain coming
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Post by AJ1013 on Jan 2, 2020 17:29:49 GMT -5
nei Awesome work as usual! Any chance I could see these charts for Tucson and Miami?
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Post by Steelernation on Jan 2, 2020 20:00:20 GMT -5
Nice work nei. Could you do Rochester? I imagine it’ll be pretty similar to Ithaca, winter is usually cloudy on average or mild days, summer usually weather on cool days. Rare to be hot and cloudy. |
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Post by Crunch41 on Jan 2, 2020 22:22:19 GMT -5
Ithaca is more cloudy than expected for the coldest temperatures. Cold mornings are very likely to be sunny in the Midwest. Closer to the Chicopee plot. I'm very surprised at how cloudy the summer days are in Ithaca. Even on warm days it's likely to be partly or mostly cloudy. Again I'm closer to Chicopee. A fully overcast, hot day is rare, even more rare if no rain falls. The coldest winter days bring the darkest blue skies. There is very low humidity and clear skies to contrast the snowy landscape. But the cold air comes from high pressure and dry weather here, and warm weather is usually from low pressure and wet.
This kind of scenery is common on the coldest days. This picture is from Northeast Minnesota so the trees are more "northern" than Milwaukee. But the clear sky and snow are the same.
Adding the two separate scales helps a lot. It's hard to see the data for the less common temperatures without it.
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Post by nei on Jan 2, 2020 23:19:49 GMT -5
nei Awesome work as usual! Any chance I could see these charts for Tucson and Miami? Thanks. Tucson is monotonously sunny a lot of the time. Tucson winter morning  Tucson winter midday  Tucson summer morning  Tucson summer midday  =============================== Miami has little temperature variation except on winter mornings; looks different from the rest   summer is so stable and cloudless skies are rare   |
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Post by nei on Jan 2, 2020 23:22:10 GMT -5
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Post by srfoskey on Jan 3, 2020 1:06:26 GMT -5
Can you do OKC and Raleigh while you're at it?
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Post by nei on Jan 3, 2020 17:01:14 GMT -5
Nice work nei. Could you do Rochester? I imagine it’ll be pretty similar to Ithaca, winter is usually cloudy on average or mild days, summer usually weather on cool days. Rare to be hot and cloudy. I'll do it eventually but it's not going to be interesting since as you said it'll be very close to Ithaca. |
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Post by Deleted on Jan 8, 2020 20:46:57 GMT -5
Same as with rainfall, cloudy weather in winter is warmer, cloudy weather in summer is cooler.
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Post by Strewthless on Jan 9, 2020 13:55:08 GMT -5
In winter I generally associate clear days with subzero temperatures.
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Post by desiccatedi85 on May 31, 2022 21:08:54 GMT -5
I associate cloudiness with colder than average maximum temperatures (and warmer minima) in all seasons. The exception here may be early winter, when sun angles are at their weakest, so it being sunny when a very cold airmass is present will still produce very cold maxima.
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Post by Steelernation on May 31, 2022 21:37:12 GMT -5
Cloudiness can come with any temps but precipitation almost always comes with below average temps.
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Post by Deleted on May 31, 2022 22:56:28 GMT -5
In Jakarta/Bandung/Java
Below average max: usually comes with rain/clouds
Below average min: usually comes with clear skies and drier southerly airflow. But on some occasions, can also happen during the wet season with early morning rain
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Post by Deleted on Jun 1, 2022 0:47:13 GMT -5
In Sydney, cloudiness is always associated with cooler weather in both summer and winter, despite clear nights being colder than cloudy nights during the winter. In summer, cloudiness signifies that cool, oceanic winds will take over hot, continental winds; while in winter, cloudiness signifies that colder maxima will occur.
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