Rain is lethal acid on Cybertron. So when a newly recruited Autobot notices it, they will most likely grab you and hold you close until they think death has passed.

It was a decent day for you, a newly recruited N.E.ST. agent, walking alongside with Ironhide, normally a gruff, bold brave Autobot weapon specialist, and just a grumpy 'bot in general, noticed it was raining.

To you, you thought 'Aw cool! A nice way to unwind after the day with Ironhide.' Ironhide, still being new to earth, thought it was rain was harmful, just like it was on Cybertron, grabbed you in his servos and cupped you in them, and brought you inside the base, to wait out the storm