Here was a post on Eurasian snow pack from last year:
Here's a thing. In December 2010, Ireland had its lowest temperatures ever recorded. And a lot of snow. The weather system extended over most of Nothern Eurasia. So was snow extent significantly larger than ever in that part of the globe?
Well, no. December 2010 was only the 6th largest snow extent every recorded since 1966 (when records began), according to Rutgers University Global Snow Laboratory.
Rutgers University Climate Lab :: Global Snow Lab
Ok, 9 of the 10 largest snow extents occurred since 1979 - when global warming was supposed to have "kicked in" after a midcentury pause. But, on the other hand, 8 of the 10 lowest snow extents occurred since 1979 also. In fact, the chart (below) shows no trend whatsover. So bang foes "global cooling" for a start. Global warming?
Take a look at the June snow extent.
The lowest line in the above chart shows an unmistakeable downward trend. The horizontal lines are the medians - the value that splits the distribution 50% on each side. The last seven points are all below the median - an event that has a probability of 0.5^7 = 0.008, and extremely unlikely event. Testing the Null Hypothesis that there is no underlying change, that Hypothesis must be rejected.
Similarly with the middle line. Here the last 6 are above the median, an event which has the probability of 0.5^6 = 0.015. Indeed, 9 of the last 10 points are above the median - an event which has a probablility of 0.01.
These are indicators of a changing process - and it must mean warming. The only alternative to global warming is that a natural variability is at work (indeed working as well as global warming is also possible), but put the evidence beside glacier decline and other indicators and the evidence is highly plausible.
Also, of the top 10 June extents, only one occurred since 1979. Of the lowest 10, all occurred since 1983. Of the top 10 melts (Dec - June Difference), the top 8 all occurred since 1989. Of the the lowest 10, only 4 occurred since 1979 (1979, 1980, 1984, 1986).