Sadly, it's an issue with the data that Meteohub doesn't provide. I'd tried to calculate it using (in MH-defs.php)
if(substr($WX['year1_rain0_ratemax_time'],0,4) > '2010') { // got a last rain valid date
$dateoflastrainalways = MHdateOnly($WX['year1_rain0_ratemax_time'],$SITE['WDdateMDY']);
$timeoflastrainalways = MHtimeOnly($WX['year1_rain0_ratemax_time']);
//$dayswithnorain = intval((strtotime(date('Y-m-d'))-strtotime(MHISOdateOnly($WX['year1_rain0_ratemax_time']))-1)/86400);
}
but the $WX['year1_rain0_ratemax_time'] only changes when the maximum rate for a storm is larger than the prior one, and not the actual date of the last rain -- there is no Meteohub tag with that data, so the line computing $dayswithnorain is commented out.
If Meteohub provided the data reliably, it would have been presented

Best regards,
Ken