pbjosh
missing the neotropics
I mean, to be clear, I don't completely ignore the seasons. But even beyond the time I spent contiguously from Colombia - Peru (nearly 2 years) I tend to plan most trips with a less aggressive schedule to allow for weather delays / hard to find birds / desire to hang out somewhere longer / etc. And aside from rain / landslide issues, in terms of finding the birds, I really don't think that it makes much of a difference from about 20 N to about 20 S. Off season birding can be better sometimes as more species are running around in mixed flocks, antbirds are more vocal during the rainy season, tinamous and quail-doves can't year you as well on wet leaves / if it is actually raining (though on the flip side leaftossers are much easier to find when it is dry as you hear them rustling leaves)... but I guess in the end it all balances out.