USA’s National Oceanic and Atmospheric Administration (NOAA) provides data here on snow cover.
Because global warming is supposed to be leading to less snow, one would think that snow cover in terms of area would be trending downwards over the past 50 or so years. However, the data tell us a very different story.
Surprisingly wintertime snow cover area has actually been trending upwards over the past 50 years and all-year snow cover in the northern hemisphere has been pretty much steady, and even of the rise over the past 25 years!.
The following NOAA chart shows us the northern hemisphere show cover for November:
Clearly the November trend is solidly upwards, with especially great area extents over 5 of the last 6 Novembers. The next chart is for December:
In December as well we see especially vast snow cover over many of the past 15 years – even higher than the winters of the 1970s, when we were being bombarded with warnings of global cooling.
Next we present the data for January, where see no change over the past 48 years:
However in January, over the past 25 years we can make out a rising trend as well. Claims that snow is becoming a thing of the past are very false.
February’s trend tell us the same story: greater snow cover:
Again here as well the powerfully upward trend is clearly visible since 1990.
The same is true for the autumn months of September and October.
The spring and summer months, however, show a downward trend, and so global warming alarmists may be quick to seize upon these data as evidence supporting their hypothesis.
But here as well when you leave out the cold 1970s and 80s and look at the trend since 1990, little is really happening during the spring and summer months.
The next chart shows the northern hemispheric snow cover for the whole year:
The whole year trend is only very slightly downward – hardly anything that looks “catastrophic” and would put us on the verge of the dramatic-sounding climate system “tipping point”.
In fact eyeballing the all-year trend from 1990, here as well we see that snow cover is tending upwards rather than downwards, hence there’s no reason for any alarm with regards to snow cover.
As far as northern hemispheric snow cover is concerned, everything remains well within the range of natural variability.