KnowAir Historical — Past Weather Data

Query historical weather data for up to 72 hours back using the Caiyun Weather API.

Prerequisites

1. A valid Caiyun Weather API token set as CAIYUN_TOKEN environment variable, or stored in ~/.config/knowair/token.
2. Coordinates (longitude, latitude) for the target location.

Quick Start

python3 scripts/query_historical.py --lng 116.3176 --lat 39.9760 --hours 24

Workflow

1. Resolve coordinates — convert city name to coordinates if needed.
2. Run the script:

```bash

python3 scripts/query_historical.py --lng --lat --hours

```

1. Present results — summarize temperature range, weather changes, and notable events in the past period.

Options

Defaults

• Hours back: 24
• Language: en

Failure Handling

• Missing token → exit code 2 with setup instructions.
• API error → exit code 1 with error details.