This is intended to be a bit on the light side, but still something to be aware of.

For the 2nd time in five years this situation happened where I wasn't able to depress the gas pedal on a winter morning. I had the van parked for about a week in the snow (West Michigan). This morning I decided to take it to work instead of the car. I reached in the passenger side with the key to start, and that was no problem. Five minutes later I got in and the gas pedal wouldn't go down at all, stuck tight!

I opened the hood and lo and behold there was a single long thick icycle formed right on the throttle mechanism that was solidly embedding it all. The snow had melted in through the upper hood edge and over several days had accumulated. Not a big deal, but would have been a problem if someone unaware would push with all their strength and bend something.

 

There is a gasket between the hood and engine compartment opening that's suppose to keep water from getting in from the cowl area. Is yours still intact? I guess if the water accumulation is deep enough, they can get past the gasket.

Once I was driving from Pontiac to Dearborn in the middle of a snow storm that caused some problems. I had modified the engine to remove most of the emission control parts, including the heat riser. So it sucked in a lot of snow, right through the air filter, which froze into a solid chunk of ice around the carburetor barrel, and eventually the engine sputtered off. The throttle was stuck as well.

 

I doubt it sucked in snow. When you run a gas engine with a carburettor in cold but humid weather, the gas evaporating as it goes through the carburettor venturi cools the air some more, and water starts to condense out of the air, just like a cold glass gets wet on the outside on a hot summer day.
If it is cool enough, the air temperature in the venturi can go below freezing, and the ice builds up on whatever it can. Like the throttle plate.
And frost will form on the outside of the carburettor when this happens