Poor night on 472kHz WSPR

Last night was a poor one on 472kHz WSPR. Both on RX and TX (10mW ERP to the earth-electrode "antenna" in the ground) there were far fewer spots. I am wondering if after several days of rain, the soil conductivity is higher so the effective loop size in the ground is much smaller? Or were conditions just poorer?

Overnight on 472kHz WSPR here

Martin G8JNJ modelled my ground loop at 475kHz and got the "gain" as -33dBi. This seems about right and it maybe even worse!

UPDATE 1338z: I have been on 472kHz WSPR all day. Spots received up to 203km in daylight and I have spotted some new stations on 472kHz WSPR RX.