When it hits
Day 23 at 08:00 on the Student's run
Warned on day 22 by 
Cold Wave Warning, 1 day ahead.
Starts with Cold Wave Strikes, ends with 
Cold Wave Passes.
The same on every run: Wage Slave, Warehouse Manager
What comes
No zombies: this crisis is about the weather, sickness or pests, not a siege.
From the game files1
Crisis 134
| id | 134 |
|---|---|
| CrisisID | 134 |
| StartEvent | [52640] |
| EndEvent | [52642] |
| ForecastEvent | [52687] |
| ForecastStyle | 1 |
| Des | Crisis_Des_134 |
| Des_Local | 寒潮 |