>>763241Batteries in cold weather and 'lectronics in wet weather are both major problems. A deadcat is fine for a short time in dew or misty/light rain, but other than that you need a canopy of some kind or just bag your shit and call it quits. When I record overnight I cinch a trash bag around my gear in the early AM and hope it doesn't get too dewy by morning. Now, in the cold I keep my batteries in an inner pocket and take them out while recording. It's a pain in the ass to keep pulling batteries to keep them warm and then reinstalling them, but it's the life, there's no other way.
Also, most condenser mics (except the exhorbitantly expensive RF variety) suffer greatly and can be permanently damaged in high humidity, so it's a risk you have to weigh if you want to take mics out on humid days. I own two pairs of my mics and two of them have been rendered useless for outdoor recording due to humidity exposure. I keep them because they still work fine indoors, but out of the 4 mics only two still withstand humid air without crackling or rumbling.
In short, environment's a fucking bitch. And the wetter or saltier your location the worse it is. You gotta pay top dollar for mics engineered for robust field recording.