Jason
Jason, located in Overland Park, Kansas, supplied weather instruments for the home market. I don't have much information on Jason, such as the years in business or whether they are still operating. Some of their weather instruments are labelled 'Made in USA', others appear to be imported.
From 1966, a commercial catalog page showing Jason weather instruments is available below (1 page):
Here is an undated Jason weather instrument catalog, I would estimate that it's from the late 1970s (12 pages):
