How do I add meta descriptions to Archives in Wordpress?

[NetPicks]

My most recent crawl returned a number of 'missing meta description' errors, and when I checked individual URLs, it turned out they were Wordpress Archived pages - for individual months and days (e.g. http:// .../2011/01).

What's the best way to go about adding descriptions to these pages, if at all? Or should I have these pages not be indexed?

I am using the All in One SEO plugin, so maybe there is an easy fix through this plugin, or it may be the cause of these errors?

Any help is appreciated, thanks in advance!

**EDIT

After looking it up further, I have decided to use noindex for Archives, which should solve my problem right? Or is there a benefit to having those archived pages?

[AlanBleiweiss]

there should always be one way search bots can crawl your site to get to the content - even the deepest content. If you've got that in place, any other path can be noindexed, or index/followed.