That probably wasn't a headwind on the way out so slow down.
5mph tailwind when you are travelling at 25mph will give you that 20mph headwind.
It is summer over here--well at least the temp is up and the sun keeps shining. Most years we have a Southerly as the prevaling wind. This year it is a South Westerly to West wind so all the routes have been messed up. Try to go out with a headwind to take advantage of a tailwind home- but west is flat and open and boring. Always have a difficult ride with crosswinds now and they are not good.
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How long was I in the army? Five foot seven.
Spike Milligan