It's almost May... It's been under 10 degrees recently...
Do I have to start driving Leaded Gasoline Powered Cars again to get Global Warming back up and running?...
Oh... More Snow and Colder Temps longer IS Global Warming?...
Got it.
Is algore still Hibernating?...
peace...
In the first place, snow and freezing temperatures on the plains of Colorado isn't all that uncommon in April. One of the worst blizzards I ever encountered was in eastern Colorado (east of the Rockies) in April.
Secondly, and to your larger point, yes global warming really can lead to colder temperatures in certain locations. It has to do with the dislocation of warm ocean currents by ice melt.
For instance (and I'm speaking theoretically here), massive ice melt in the Arctic can feed colder waters into the north Pacific, causing the Japanese Current to turn south earlier and farther south than it typically does. Since the weather systems affecting Colorado are typically born over the Japanese Current, such a dislocation could result in storms leaving their usual track and heading farther south. Melting ice can also affect the location and power of the Alaska Gyre, which is also a big weather producer. We could see the same thing in relation to the Gulf Stream, where global warming would result in colder and longer winters for northern Europe.