Rainfall 48"
Humidity 76%
Depending on which site has the info.
My best outside hay storage is to put bales on logs so they can't touch the ground or touch other bales. If the bales touch end to end fire ants carry dirt up between the bales and nest there. They spoil the hay at the ends and I don't want them stinging me or my cattle. Last year I didn't get the bales on logs and my loss was more than usual. The jury is out on whether to tarp hay stacked on logs. If not on logs and tarped it tends to wick up moisture.
If you have a better method short of a shed please tell me.