ITU Rain Zone Calculator — LinkZoneTools

ITU Rain Zone Lookup – LinkZoneTools

ITU Rain Zone Lookup — Per ITU-R P.837-7

ITU Rain Zone Lookup

Enter a location to find its ITU-R rain zone designation and point rainfall rate. You may also click anywhere on the map.

⚠ Important: Rain attenuation values are statistical models (ITU-R P.838-3 at 0.01% annual rate). Zone boundaries are approximate. Verify with manufacturer link planning tools before final design.

⚠ This tool: ITU Rain Zone Lookup — Attenuation values per ITU-R P.838-3 at 0.01% annual exceedance rate. Actual rainfall and attenuation vary. Use manufacturer link planning tools for final design.

Street Address or Place Name

or enter GPS coordinates directly

GPS Coordinates (Decimal Degrees)

Latitude (°)

Longitude (°)

Frequency Band — Optional

Geocoding address, please wait…

ITU Rain Zone

Enter a location above to look up

Rainfall Rate (0.01% of Year)

—mm/hr

Location (Lat / Lon)

—

Zone used for this result manual

The automatic lookup approximates the ITU-R P.837 map using latitude and longitude bands. If you hold a published zone for this site — from a regulator, a link plan, or the ITU map itself — select it here and it will be used for the rainfall rate and attenuation above.

Enter an address or GPS coordinates above, or click anywhere on the map, to retrieve the ITU rain zone and rainfall rate for that location per ITU-R P.837-7.

Click anywhere on the map to look up that location

ITU Rain Zones (rainfall rate mm/hr @ 0.01%)

⚠ Important — Please Read Before Using This Tool

LinkZoneTools LLC · ITU Rain Zone Lookup · Terms of Use & Disclaimer

📋 Reference & Educational Use Only

This tool is provided for reference, planning, and educational purposes only. It is not intended to constitute, and shall not be construed as, professional RF engineering advice or a guarantee of wireless link performance. Results are estimates based on theoretical models and published data.

⚠ Tool-Specific Notice — ITU Rain Zone Lookup

ITU rain zone boundaries are geographic approximations. Zone assignments near regional boundaries may differ from actual conditions. Rain attenuation values are statistical models based on long-term averages — actual rainfall events may exceed or fall below these values. Always use the ITU Rain Zone as one input in a broader link analysis, not as the sole design criterion.

🌐 Third-Party Data & APIs

Some LinkZoneTools tools use third-party data sources including OpenStreetMap geocoding, Open-Meteo elevation API, OpenTopoData, and ASTER GDEM terrain data. LinkZoneTools LLC does not control these sources and makes no warranty as to their accuracy, availability, or currency.

⚖ Limitation of Liability — No Warranty

LINKZONETOOLS LLC PROVIDES THIS TOOL "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. LINKZONETOOLS LLC SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES ARISING FROM USE OF OR RELIANCE ON THIS TOOL, INCLUDING FAILED WIRELESS LINK DEPLOYMENTS, EQUIPMENT LOSSES, LOST REVENUE, OR BUSINESS INTERRUPTION. THE USER ASSUMES ALL RESPONSIBILITY FOR FINAL DESIGN DECISIONS AND THEIR OUTCOMES.

👤 User Responsibility

By using this tool, you acknowledge that: (1) you will independently verify all outputs against current authoritative sources; (2) you will use manufacturer link planning software as the final design authority; (3) you will conduct a physical site survey before specifying equipment or antenna heights; and (4) LinkZoneTools LLC bears no responsibility for any errors, omissions, or outcomes resulting from use of this tool.

I have read and understood the above disclaimer. I agree that this tool is for reference and educational purposes only, and I will independently verify all outputs before any final design, procurement, or installation decisions.

📚 How the ITU Rain Zone Tool Works

What does this tool do?

Rain acts like a wall for high-frequency radio signals. This tool tells you how much signal you’ll lose to rain at your location and frequency — critical for links above 6 GHz.

What is an ITU Rain Zone?

The ITU divides the world into 15 zones (A–Q) based on local rainfall intensity. Florida is Zone N (95 mm/hr), the UK is typically Zone E (22 mm/hr), the Amazon is Zone P (145 mm/hr). The zone determines the worst-case rainfall rate used for link budget planning.

When does rain matter?

Below 6 GHz: negligible (<0.1 dB/km even in Florida)
11–18 GHz: moderate — include in budget
23–38 GHz: significant — often the limiting factor
60–80 GHz: severe — limits link distance in tropical zones

💡 Rule: Below 6 GHz, ignore rain. Above 11 GHz, always run a rain budget. Above 23 GHz, rain usually sets your maximum link distance.