I'm trying to find the temperature specification for RB433 and RB433L.

For RB433, two different specs appear.

On the main routerboard.com page, the operating range is given as -30C to +60C.
Following the link to the user manual, we see a range of -20C to +65C. Note that the user manual shows that it applies to both RB433 and RB433AH, and is dated 09-June-2009.

For RB433L, the main routerboard.com page does not provide any information on temperature range. There is no full user manual provided, and none of the other links provide any information about temperature range.

Can anyone shed some light on this? I'm hoping the answer is +65C on the upper limit for both RB433 and RB433L but I don't want
to find out the hard way.

how do you know what the board temp is? I would love to make a monitor oid for the dude but I dont think the 433 has temp sensor on board

There is no way to determine the board temperature. You are right that these boards don't have temperature sensors.

I am looking for the specification of the maximum ambient temperature at which the board can operate. The specifications on the routerboard.com website are inconsistent for the RB433 and missing entirely for RB433L.

Anyone out there at Mikrotik who has an answer?