| Region | Spring Personality | Oddity | | :--- | :--- | :--- | | | The "Hot Spring" (March-May) | Temperatures hit 40°C (104°F) before the monsoons—no gentle thaw, just a furnace. | | Australia (Sept-Nov) | The "Wind & Fire" Spring | Strongest winds of the year, raising extreme fire danger before summer heat. | | Arctic Circle | The "Crack-Up" | Sea ice breaks with sounds like cannon fire—loud enough to register on seismographs. |
The polar jet stream, a river of strong winds at 30,000–40,000 feet, weakens but becomes wavier in spring. Instead of a smooth west-to-east flow, it develops deep troughs (dips) and ridges (bulges). A trough allows Arctic air to plunge south; a ridge allows tropical air to surge north. These sharp contrasts generate intense low-pressure systems. spring season weather