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Post by Deleted on Jan 29, 2022 15:13:19 GMT -5
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Post by tommyFL on Jan 29, 2022 15:54:34 GMT -5
Not really. You could get an approximation by counting clear days as 100% sun, partly cloudy days as 50% sun, and cloudy days as 0% sun, but methods using solar radiation are much more accurate. However, even though the Angstrom formula has typical accuracy within 2-3 percent for most locations when compared to Campbell-Stokes recorders, it has much lower accuracy at high latitudes. At Cold Bay's latitude, it may significantly underestimate sunshine. I will find a nearby station that records solar radiation and report what I find.
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Post by tommyFL on Jan 29, 2022 16:17:58 GMT -5
Unfortunately, the nearest station to Cold Bay with solar radiation data is Yantarni Bay RAWS, over 200 miles to the northeast. Using Angstrom formula over the period of record 2010 to 2022 yields an annual sunshine total of 1764 hours or 40% of possible.
For comparison, I found a station with good solar exposure close to Anchorage. Point Mac RAWS averages 2106 hours (48% of possible), compared to 2061 hours at Anchorage. About 2% error, which is quite good considering the latitude. Now, Cold Bay may indeed be significantly cloudier than Yantarni Bay. I would be impossible to tell without a closer station.
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