I have never used the analog version but it should work and is available from distributors here.
I have used the I2C SHT-31 with very cheap (few $) picaxe and micromite processors to get an RS-232 serial output. The regular SHT-31 is available mounted on a board from many ebay sellers for a few $. It would not take much additional work to also generate an analog voltage output from that sensor/chip combination.