[r2]

do you have a peddle stop screwed into the floor?
maybe hitting off center if you do?

 

[r2]

let me ask;
if the car is not running, and you push the clutch peddle by hand, does it click, and if so, can you see the exact spot it clicks in?
i ask because there is a large plastic slide switch attached (ignition interlock) that could make a clicking sound. and because it is plastic, it will expand and contract and may or may not click under certain weather conditions. (temp) like you said.

 

[r2]

to answer the last first, yes. though it is called "clutch pedal switch" see link
https://www.fcpeuro.com/products?keywords=61319231129
now, there is no physical connection between the pedal and any other clutch parts. its all hydraulic. so i very highly doubt a click or a knock or tap could be transmitted to the pedal itself from the fork or throw. not to say you cant "feel" those things, but an actual click being transmitted through the metal has to be local to the pedal. i attached an exploded view of your peds which i got from, https://parts.bmwofsouthatlanta.com/products/Rubber-pad/1293190/35211160422.html
i would look at the switch, spring, and any of the pivot points.

 

[r2]

anytime, thats what forums r 4.
i would go for the switch first myself. i would disconnect it from the housing and try it by hand again. there is a spring in it, so may be the issue.
let us know what u find.