Parts are independent

The weather-station archetype (this module's workshop problem): one array of readings, three behaviors. It exercises every FRQ-Q1 muscle:

• Count with a condition (below freezing): one accumulator, one comparison. The trap is < vs <= against 0.0 — the spec's word "below" means strict.
• Longest streak (warm run): the run-counter pattern with a reset. Two state variables (current run, best run) and the reset branch are the whole problem.
• Parallel-array average: walk indexes (not for-each) because two arrays advance together; guard the nothing-matched case so it returns 0.0 instead of NaN.

Notice each part reuses a pattern from modules 4–7. The FRQ is not new material — it is your existing patterns under one story, with the story trying to confuse you about which pattern applies.