Rainfall Totals Map
Choose a point and dates to sum Open-Meteo archive precipitation at 25 sample points. This is total precipitation including snow water equivalent, not rainfall alone or a gauge measurement.
By Aryan Khan, Founder & Editor · Updated October 2026
The displayed total is modelled precipitation, not necessarily rainfall or what fell at one exact property.
How to use Rainfall Totals Map
Actual rain for actual dates, from the archive:
This tool sums complete daily precipitation values at 25 sample points from the Open-Meteo archive. Precipitation includes frozen precipitation as water equivalent; it is not a rainfall-only measurement or a gauge record.
- 1Set a point.
- 2Choose a date range.
- 3Press “Map the precipitation” and interpret the result as modelled total precipitation.
What people use Rainfall Totals Map for
1. Trip and event weather forensics
'It rained the whole festival' — check the archive totals for those exact dates and that exact valley. Memory exaggerates; archives merely approximate.
2. Garden and land decisions
Compare a plot's last-season rainfall with the climate story told about it. The Snowfall Totals Map (Season Archive) covers the frozen share of the same sky.
3. Drought and deluge context
Compare periods as context, but the tool displays one period at a time and does not calculate an anomaly against a climate normal.
4. Relocation research
Averages hide timing: a place can take its rain in three violent weeks or thirty gentle ones. Date-ranged totals across several years show the rhythm, not just the sum.
Worked examples
A yearly total can differ from station measurements and includes frozen precipitation as water equivalent. Compare modelled periods with authoritative climate sources.
Each displayed cell represents the modelled precipitation sum at its sample point, not a measurement at every location inside the cell.
Reading the archive grid
The displayed cells are based on modelled values at sample points.
| Item | Meaning |
|---|---|
| Provider | Open-Meteo historical weather archive |
| Grid | 25 sample points over an area about 25 miles wide |
| Daily values | Summed over the inclusive selected dates; incomplete data is rejected |
| Not this | Live conditions, an exact gauge record or a certified decision tool |
Model selection, archive coverage and spatial resolution depend on the provider and dates. Data can differ from local measurements.
How to interpret the result
The most common errors come from using a correct result to answer the wrong geographic question. Keep these points in mind for Rainfall Totals Map:
- Include your height inputs explicitly (eye height, mast height, deck level) when sharing visibility results: the same hill answers differently for a child, an adult and a 10 m antenna, and unstated heights make numbers unreproducible.
- Treat climate and hardiness outputs as 30-year character, not this year's weather: a zone tells you what winters usually allow, and microclimates — walls, slopes, urban heat — shift a real garden half a zone either way.
Limits & appropriate use
Terrain intelligence carries one dominant limit: the model sees bare earth at ~90 m spacing with metres of vertical error, and is blind to canopies, walls and wires. Every downstream answer inherits it — profiles show terrain truth with noisy amplitude, line-of-sight verdicts are pending trees, horizons assume open ground, and solar radiation averages assume an unshaded panel. The second limit is temporal: climate letters and hardiness zones are thirty-year character, not this year's behaviour, and seismicity is a mood, not a hazard model. Each result here is printed with its recipe precisely so these boundaries travel with the number.
The value proposition is screening-grade truth at zero cost: orientation for sites, gardens, antennas, shoots and curiosity, with the upgrade points clearly marked. When money or safety attaches to the answer — tower siting, flood insurance, structural shading, avalanche terrain — the escalation is professional: licensed survey, certified shade studies, regulatory flood determinations and geological hazard services. A good free tool makes that ladder visible instead of pretending to be the top of it.
- Construction and tower siting → licensed topographic survey.
- Flood decisions → regulatory determinations (FEMA/FIRM in the US).
- Solar finance → certified shade and production studies.
Data & methodology
Open-Meteo archive daily precipitation_sum over the inclusive selected dates and 25 sampled points. Model selection and coverage are provider-dependent.
For source details, licences and model limitations, see Data Sources and Methodology.
Key terms worth knowing
- Köppen class
- The letter-code climate system from temperature/precipitation thresholds.
- DEM
- Digital elevation model: a grid of terrain heights, e.g. Copernicus GLO-90.
Editorial guidance: MapBench explains the method and limitations so the tool can be used as a transparent reference, not as a black-box answer. For legal boundaries, safety-critical routing, surveying, engineering, regulated decisions or official statistics, verify the result with the responsible authority or a qualified professional.
Category: Earth Science. Results are intended for everyday analysis and planning unless a page explicitly states otherwise.
Method, assumptions & limits
- This tool’s method
- Open-Meteo archive daily precipitation_sum over the inclusive selected dates and 25 sampled points. Model selection and coverage are provider-dependent.
- Before relying on the answer
- Check the location, height units and any model options shown by this calculator. A terrain lookup and a geometric Earth model answer different questions.
- What the result cannot establish
- Local terrain, atmospheric conditions and source resolution can matter more than numerical rounding. Do not use a planning result for safety-critical work.
Coverage: Worldwide. Search, basemap and external data requests may use third-party services; browser-based does not mean every operation is offline. Read the source and licence notes, calculation methodology and privacy policy. If a result looks inconsistent, report a correction with the inputs and mode used.
Frequently asked questions
Clear answers about the calculation, accuracy and appropriate use.
Is this rainfall only?
No. The daily precipitation total includes frozen precipitation as water equivalent.
What if daily data is missing?
The tool rejects incomplete series rather than treating missing days as zero.
Is this suitable for engineering or legal decisions?
Treat the result as planning or educational context unless the page explicitly says otherwise. Engineering, hazard and legal decisions should use authoritative specialist data.
Why can terrain data differ between sources?
Elevation and earth datasets vary in resolution, collection date and processing method. Small local features may not be represented equally.
Can I verify the data source?
Yes. MapBench documents major providers and methodology on the Data Sources and Methodology pages.
Precipitation or rainfall — same thing here?
No. The requested precipitation total includes frozen precipitation as water equivalent; it is not rainfall-only.
How far back can I query?
Coverage varies with the Open-Meteo archive and requested location. Requests with unavailable or incomplete daily data are rejected.
Why does the official gauge disagree with my cell?
A gauge is a point; a cell is an area average over roughly 25–30 km of model grid. A storm that parked over the gauge can triple its reading against the cell — both are honest, about different things.
Can I compare this year with the climate normal?
You can run periods separately, but this tool does not calculate climate normals or anomalies. Use an authoritative climate dataset for those comparisons.
Does it work for monsoon or Mediterranean climates?
Worldwide — the archive is global. Date-ranged queries are exactly how strongly seasonal climates should be read: wet season and dry season separately, never as one misleading annual blur.
What about snowfall in the total?
Use the Snowfall Totals Map for the frozen archive view; this map's precipitation includes melted-water equivalents in the source data, which is rain-gauge language, not snow-depth language.
Can I use this for a water-rights or insurance claim?
No — claims and rights run on official gauge networks and certified records. This is a research and context tool with honest sourcing, which is a different job.
Related tools and resources
The frozen archive: the Snowfall Totals Map (Season Archive); where it drains: the Watershed Finder; heights above it: the World Elevation Atlas.
More free tools
Sources, methodology & editorial trust
- ✓ Browser-first processing where supported
- ✓ External sources are documented
- ✓ No account required for public tools
- ✓ Review data sources
Calculations are documented with their assumptions, limitations and source context rather than presented as unexplained answers.
Reviewed and maintained by Aryan Khan, Founder & Editor of MapBench.
Part of our elevation & terrain hub
Rainfall Totals Map sits in the elevation & terrain cluster, alongside 40 other tools that answer neighbouring questions with different methods or datasets.
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