Hi, I've raced 4 races under wet conditions since August 26th and I noticed some inconsistencies with wet weather.
Here is the basic context :
During the first weeks of beta, wet weather tended to cap at 3.5/4mm giving more life to inters and mixing strategies between them and wet full tyres and I was happy about that. However in the last few days in August it rained in Malaysia and something unexpected happened, despite it was raining for 1/2 hours the race started at 2mm and we only achieved 3mm in the last few laps, no need to specify it rained for the entire race.
Now let's take a recent example :
Tuesday (Malaysia), it started to rain 7/8m before qualifying, knowing that and how weather worked during beta I did test runs till the last minute (:19) between inters and wet full and inters were the obvious choice 4s faster so I picked them for the first stint. But as soon as the qualifying finished I opened the viewer and noticed at ":26" that the track was at 5mm wet !
2 days after, the same happened in China : It started to rain 10m before qualifying so I did the same testing both inters and wet full till the end and they again were 4s faster as well but knowing what happened in the last race I opted for wet full to not be fooled like the previous race. And this time .. the race started at 2mm and even if it rained for half of the race (13/14 laps) we never saw 3mm and then it started to dry. Last example with Japan 2 weeks ago where it rained for hours before the race and during it and where it started and finished at 2mm ..
In conclusion it seems there is something wrong with wet weather not able to gain wetness when it rains and starting with irregular values at the start of a race (5mm in Malaysia, 2mm in China).