"Early dew" is of course correct. I thought that, even as I typed "rain," so I fished out a hymn book and a magnifying glass to check and read "rain." A further check in the same book in the light of Whistleblowers gentle correction showed that it had said "dew" all along. That shows how little credence can be attached to my view of events on or off the field.
"Dew" is much more appropriate, not least because early rain in Brighouse is quite likely to last all day, and possibly most of the night.