I see that the WS90 sensor array can now be received by the RTL_433 software.
It's pre-release at the moment with some data fields still to be defined, some of which I expect are firmware version and extra rain data.
I used command line;
>rtl_433.exe -M Level -R 244 -Y minmax
and received;
model : Fineoffset-WS90 ID : 65949a
Battery : 1.000 Battery Voltage: 3280 mV Temperature: 11.1 C Humidity : 99 % Wind direction: 327 Wind speed: 0.6 m/s Gust speed: 0.7 m/s UVI : 0.0 Light : 0.0 lux
Flags : a9 Total Rain: 1548.7 mm Supercap Voltage: 4.9 V Extra Data: 2f263c7f31c31fcfbab900007b Integrity : CRC
Modulation: FSK Freq1 : 433.9 MHz Freq2 : 434.0 MHz
RSSI : -0.1 dB SNR : 31.3 dB Noise : -31.4 dB