hazwoper Posted November 13, 2014 Share Posted November 13, 2014 Can someone point me to a resource where I can find historic monthly cloud cover data? TIA Link to comment Share on other sites More sharing options...
Roger Smith Posted November 19, 2014 Share Posted November 19, 2014 Does this help? http://www.erh.noaa.gov/ctp/features/2013/sky_cover/index.php I would suggest that you google such keywords as U.S. cloud cover data, U.S. sunshine data and see what you can find. Sunshine hours are not exactly the inverse of cloud cover, for one thing they only represent daytime hours, but also there can be some cloud around when sunshine is burning the strip in the recorder, usually you can figure that mean cloud cover in percent plus sunshine in percent will equal about 115 to 120. So if you can just find historical sunshine data you can assume that cloud cover was something like 20% greater than 100 minus sunshine percentages. Link to comment Share on other sites More sharing options...
hazwoper Posted November 19, 2014 Author Share Posted November 19, 2014 Thanks, Roger. I actually found this, but it propbably has the issue you address (clouds for day and night and I need night). http://www.nws.noaa.gov/climate/index.php?wfo=phi Link to comment Share on other sites More sharing options...
famartin Posted November 28, 2014 Share Posted November 28, 2014 Just a reminder if you are aware or a helpful point if not: ASOS doesn't observe clouds above 12,000 feet (it can but they haven't implemented the programming due to a METAR coding issue, I believe). At this time, I would therefore only truly trust FAA Service Level A sites for reliable cloud cover on F6 products since ASOS implementation. For the PHL area, that's just PHL itself. Here's a listing of ASOS by service level: http://apps.avmet.com/awad/SvcLvl.cfm Link to comment Share on other sites More sharing options...
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