Create weather.sql

mysql> describe weather;
+----------+-----------+------+-----+-------------------+-----------------------------+
| Field    | Type      | Null | Key | Default           | Extra                       |
+----------+-----------+------+-----+-------------------+-----------------------------+
| ts       | timestamp | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| temp     | float     | YES  |     | NULL              |                             |
| humidity | float     | YES  |     | NULL              |                             |
| pressure | float     | YES  |     | NULL              |                             |
| light    | int(11)   | YES  |     | NULL              |                             |
+----------+-----------+------+-----+-------------------+-----------------------------+