These are not natural clouds

The evolution of a sunny day 

in Lower Hutt

This is how the sky appeared with the naked eye at 9 am

And this is how it really looked - through tinted glass. 

You can see the high cirrus clouds blotting out the sun.

And by mid-afternoon it looked like this.

In the old days we would watch the cloud coming over the horizon.

Now it just metamorphoses.