BUT:
California’s two
hottest stations
do not have data
prior to 1940
in the GHCN database,
so they need
to be removed
to do a fair comparison
of 2018 and 1931.
When Needles
and Death Valley
are removed,
California
July temperatures
are dropping sharply
since 1931, and
July 2018 was
five degrees cooler
than July 1931: