Important

Archival Notice This repository is archived and is no longer actively maintained. Release v1.0.0 represents the final, stable version of this library featuring both NOAA Climate Data Online (Climate / NOAA) and National Weather Service (Weather) clients. You are welcome to fork the project for further development.

NOAA API Client

A modern Python client for NOAA's Climate Data Online (CDO) and National Weather Service (NWS) APIs. This library provides a clean, unified interface to retrieve historical climate archives as well as live weather forecasts, alerts, and observations.

Features

• National Weather Service API (Weather):
  • Point metadata, 7-day textual forecasts, and hourly forecasts by latitude/longitude
  • Active and historical weather watches, warnings, and advisories (filtered by state, zone, urgency, severity)
  • Live and historical station observations across airport and marine stations
  • Forecast zones, public zones, Weather Forecast Offices (WFO), and glossary
  • No API key required (requires a user agent)
• Climate Data Online API (Climate / NOAA):
  • Full coverage of CDO endpoints (datasets, data types, locations, stations, data)
  • Historical observations from GHCND, GSOM, GSOY, and more
  • Filter by date range, station, location category, and units
  • Requires a free CDO API token
• Reliable & Production-Ready:
  • Comprehensive input validation with clear errors
  • Configurable timeouts and structured error handling (APIError, ValidationError)
  • Full typing support for IDE autocomplete
  • Extensive test coverage (90%+)

Installation

Using pip:

pip install noaa-climate

Using uv:

uv pip install noaa-climate

Quick Start

1. Weather Forecasts & Alerts (Weather)

The National Weather Service API (https://api.weather.gov/) is public and free to use without an API token:

from noaa import Weather

# Initialize weather client (custom User-Agent recommended)
weather = Weather(user_agent="my-weather-app ([email protected])")

# 1. Get 7-day forecast by coordinates (e.g. Central Park, NYC)
forecast = weather.get_forecast(40.7829, -73.9654)
for period in forecast["properties"]["periods"][:3]:
    print(f"{period['name']}: {period['temperature']}°{period['temperatureUnit']} - {period['shortForecast']}")

# 2. Get hourly forecast
hourly = weather.get_forecast(40.7829, -73.9654, hourly=True)
next_hour = hourly["properties"]["periods"][0]
print(f"Next hour: {next_hour['temperature']}°{next_hour['temperatureUnit']}, {next_hour['shortForecast']}")

# 3. Get active weather alerts in a state
alerts = weather.get_active_alerts(area="CA")
print(f"Active alerts in CA: {len(alerts['features'])}")

# 4. Get latest observation from an airport station
obs = weather.get_latest_observation("KJFK")
temp_c = obs["properties"]["temperature"]["value"]
print(f"KJFK Temperature: {temp_c}°C")

2. Climate Data Online (Climate / NOAA)

The CDO API requires a free API token:

1. Visit https://www.ncdc.noaa.gov/cdo-web/token
2. Enter your email address to receive your token

from noaa import Climate  # or `from noaa import NOAA`

# Initialize client
client = Climate("your-api-token-here")

# Get available datasets
datasets = client.get_datasets(limit=10)

# Get temperature data
data = client.get_data(
    dataset_id="GHCND",
    station_id="GHCND:USW00094728",  # Central Park, NYC
    start_date="2023-01-01",
    end_date="2023-01-31",
    data_type_id=["TMAX", "TMIN"],
    units="metric",
)

Examples

Weather Alerts by Severity

from noaa import Weather

weather = Weather()

# Get severe or extreme active alerts
alerts = weather.get_active_alerts(
    severity="severe",
    area="TX",
)
for feature in alerts["features"]:
    props = feature["properties"]
    print(f"[{props['event']}] {props['headline']}")

Station Search & Metadata

from noaa import Weather

weather = Weather()

# Get stations in New York state
stations = weather.get_stations(state="NY", limit=5)
for feature in stations["features"]:
    props = feature["properties"]
    print(f"{props['stationIdentifier']}: {props['name']}")

Error Handling

from noaa import Climate, Weather
from noaa.exceptions import APIError, ValidationError

weather = Weather()

try:
    # Coordinates must be valid latitudes [-90, 90] and longitudes [-180, 180]
    weather.get_forecast(100.0, -74.0)
except ValidationError as e:
    print(f"Validation error: {e}")
except APIError as e:
    print(f"API request failed (status {e.status_code}): {e}")

Project Structure

noaa/
├── src/noaa/
│   ├── __init__.py       # Package exports (Climate, Weather, NOAA, etc.)
│   ├── client.py         # Climate / NOAA client (CDO API)
│   ├── weather.py        # Weather client (NWS API)
│   ├── exceptions.py     # Custom exceptions (APIError, ValidationError)
│   ├── validators.py     # Input validators
│   ├── utils.py          # HTTP requests and parameter utilities
│   └── climate.py        # Backwards compatibility module
├── tests/
│   ├── test_client.py
│   ├── test_weather.py
│   ├── test_validators.py
│   ├── test_utils.py
│   ├── test_exceptions.py
│   ├── test_climate.py
│   └── conftest.py
├── docs/
└── pyproject.toml

Documentation

Full documentation is available at https://andreassag.github.io/noaa/

License

This project is licensed under the MIT License - see the LICENSE file for details.

Resources

• National Weather Service API Documentation
• NOAA CDO API Documentation
• Request CDO API Token

Support & Contributing

• Report issues on GitHub Issues
• Read the documentation
• Ask questions in Discussions