These two maps represent the drought just in a 2 year difference. The first map on the left was in 2012, the drought was spread through most of the U.S. The second map on the right was 2 years later in 2014 and the whole drought shifted towards California, and effected California badly.
In these two maps it is a 16 year difference of the annual average climate. In the first map, it is much cooler than the second map which is much higher temperature. Huge difference, the weather is much warmer now days everywhere, not that many cool places.
These two maps represent the difference between the oceans monthly SST anomaly global in seventeen years. The first map is from 2000 and the second map is from 2017. In the first map you can see how much cooler the ocean was, but on the second map it is much warmer, over the years the ocean temperature has changed dramatically.
These two maps represent the sea surface temperature. The map on the left is from 2000 and the map on the right is from 2006, just a six year difference. Nothing has really changed in those six year the SST is just a tiny little bit warmer obviously, but it is a very small change.
These two U.S. maps represent the total month precipitation. The map on the left was taken February 2016 and the one on the right was taken October 2016. There is a nine month difference and you can see how much it changes, in October there s way more rain, storms, hail, etc. Just five months later there is much less precipitation.