PHOENIX - Warmer-than-normal conditions persist in the Valley before a mid-week storm rings in the new year with big changes.

The weather in Phoenix was often unpredictable, with an unexpected series of fall rainstorms and a sudden December heat wave.

Severe weather in other parts of the country did manage to cause some cancellations and delays at Phoenix Sky Harbor Airport, but overall, travelers say flights were smooth on Dec. 29.

Learn more about the latest Phoenix area weather forecast and conditions with Most Accurate Forecast from ABC15.

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