Public works wants to judge winter road-treatment performance by comparing this February to January, which routinely has different storm patterns. What comparison approach should the information manager recommend?

Judging winter road-treatment performance by comparing this February to January is often unfair when seasonality and storm patterns dominate. Prefer year-over-year comparisons for the same season—or weather-normalized contrasts—rather than naive month-over-month. Adjacent months are not always the fairest comparison for weather-sensitive services. Comparing only to the single calmest winter month on record cherry-picks a flattering baseline. Dropping weather-sensitive services from all KPI reporting avoids seasonal noise by abandoning accountability. Exam caveat: month-over-month can still help short operational tactics inside a storm season, but strategic performance claims need seasonal alignment or explicit weather adjustment. Operational check: build February-to-February and storm-severity-adjusted views, annotate major weather events, document the comparison rule before briefing, and reject calmest-month baselines for public or executive success claims. In municipal information-management practice, record the rationale so future staff know which failure modes the rejected options would create for city services, and re-validate after the next cycle that the same control still holds. In municipal information-management practice, record the rationale so future staff know which failure modes the rejected options would create for city services, and re-validate after the next cycle that the same control still holds.