[OC] Die Geographie der Dunkelheit: Typische Anzahl der trüben Tage pro Jahr in den kontinentalen US
Von skier_222
![[OC] Die Geographie der Dunkelheit: Typische Anzahl der trüben Tage pro Jahr in den kontinentalen US](https://www.bytesde.com/wp-content/uploads/2025/10/k5f9cwuy7jtf1-1536x1218.png "[OC] Die Geographie der Dunkelheit: Typische Anzahl der trüben Tage pro Jahr in den kontinentalen US")
[OC] Die Geographie der Dunkelheit: Typische Anzahl der trüben Tage pro Jahr in den kontinentalen US
Von skier_222
23 Kommentare
📊 **Data Sources**
• **Cloud cover fraction:** Downscaled ERA5 reanalysis from the [CONUS404 dataset (USGS)](https://www.usgs.gov/data/conus404-four-kilometer-long-term-regional-hydroclimate-reanalysis-over-conterminous-united)
• **Cultural boundaries:** [Natural Earth 1:10m Cultural Vectors](https://www.naturalearthdata.com/downloads/10m-cultural-vectors/)
• **Color palette:** [ColorBrewer Greys](https://colorbrewer2.org/)
Hourly total cloud cover fraction from CONUS404 was averaged within each day.
Days with mean cloud cover ≥ 85% were classified as *cloudy*. The number of cloudy days per year (1991–2020) was then averaged to produce a climatology.
*Note:* These are model-based estimates, not in-situ observations, and are therefore subject to model limitations.
Need scale of more than 200 for PNW.
„Gloomy“? More like „sheltered from the scorching cancerball“….
Cloudy days are the best days to be outside.
I lived in New Mexico for about 3 years and actually started to miss cloudy days. I would look forward to the occasional exciting day when the clouds would form and we’d actually get a cooling rainstorm! Change is good
Easily improved in IL/the Midwest by making daylight savings permanent.
Sure, 100+ cloudy days is gloomy, but 0-30 sounds like a nightmare.
The rain shadow effects behind mountains are really interesting along the west coast
Staying indoors all the time due to scorching heat sounds very gloomy to me
It’s funny how in WA you can see the divide between west WA (seattle) and east WA (spokane). The dividing line is the cascade mountain range, which keeps the clouds on the west side.
Prolly in the minority here, but I kinda like my gray and snowy upstate NY days.
I assume a rainfall map would be very similar, right?
Is there a subset of conus404 that has much less data. Or, is there a community dedicated to working with this data?
I love the title of your map.
Can confirm…. Michiganders…. Grab your vitamin D supplements. Depression season is coming.
Not to be a narc here, but I think it’s damn near impossible to measure gloominess on the southern part of our Pacific coast cause the cloud coverage is so transient and usually burns off by the afternoon.
So many days that start with dense fog and when I take a walk during my lunch break I am melted by a sun wind with 0 cloud coverage.
Cloudy days are nice though.
Cloudy days are part of the beauty in New England IMO.
Yeah, as a resident I can confirm. Don’t move to the PNW. As the heat map shows, it’s gloomy 150 days a year.
The other 215 days it’s raining. Stay in sunny California!
Arizona just has a different kind of doom. The sun is the doom.
I absolutely love gloomy weather. I’d take 5 days of gloom and 2 days of sun. That would be the perfect ratio for me
If you want to see the animation of daily cloud cover changes visit https://myperfectweather.com/. Click cloud ☁️ icon and hit the play button. Hover on the map to see the value and click to see the list of cities in the county.
Click on city list to see more information.
Living in LA for 6 years made me really appreciate cloudy and rainy days. Now that I’m back in the northeast I get a smile on my face when I see it’s going to be a cloudy day
I get what you were going for with the white to black color scale, but man is it difficult to distinguish one shade of grey from another to match to the scale at the bottom