Hay smell is chlorophyll decaying -- like after you mow the lawn. It's normal to smell it right after chopping the plant and during the drying period, but if you dry slow enough it goes away. Based on your environment numbers, it dried too fast.
Good news is it will go away after awhile in jars. Burp them a couple times per week and you'll start to notice a more pleasant smell after awhile. Bad news is a lot of the volatile esters, alcohols, terpenes have evaporated so it won't smell as good as it could. More good news is it will still get you ripped and you learned some lessons.