Clever, i did a lot of ifs in my solution. It was simpler haha

nice answer

Go team linebreak

Well that should be cleaner in the kata description which leave the door open for both aprouches.
But on the other hand that's pretty irrelevant for what this Kata is trying to show us.

@jhoffner conceptually, your solution doesn't make much sense - when you're storing the temperature, you add a timestamp to it which is the date at which the next-to-be-stored temperature was taken, not of the actual temperature you're storing. Also, you store a null value as the first temperature. Seems to me the test cases aren't very well written.

Thanks for the kata. I have learned something new. :)
I think you should mention that in the kata instructions. It is not obvious requirement and I had to check in discussion why may code didn't pass the last test.
Regards,
Bozhkov