Rick ...
This really interesting stuff, but I am not sure I trust it completely.
I clicked on the link to the
National Climatic Data Center which took me to the page for
NOAA National Center for Environmental Information and I dropped down to
Climate Normals and clicked on that link. I selected "California" and then "Weaverville" and got this graph and chart:
https://www.ncdc.noaa.gov/cdo-...
The lows and highs do not reflect what temps I have experienced up here. I know my average night temps during the winter months are usually around 20F and I can tell you my summer high temps are often well above 100F.
Averaging the temps over several years skews the data significantly. Also, averaging the temps over the whole month also distorts the information.
The question becomes how useful is the information ?
I was also trying to find the chart you posted. They have some really interesting info on NOAA and now they have broken it out into a couple of sites. I could have spent hours on the stuff I was finding. I can see why you said you would get back to us later. WOW ! ... and I didn't think I could get hooked on reading about weather.... go figure.
Thanks for doing a lot of the research for us. I got buried and almost didn't finish this post ...