Raintrace — rainfall, with a paper trail

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Rainfall comparison

Selected period

—mm

Same-season baseline

—mm

Difference from mean

—%

A comparison, not a forecast

A year in context

Monthly precipitation. Highlighted months form your comparison.

TargetBaseline mean

Read the monthly values as a table

Month	Target (mm)	Baseline mean (mm)	Included

How variable is the baseline?

Every dot is one same-season total from 1991–2020.

Before using this in a plan

The grid covers roughly 50 × 60 km. Coastal terrain and mountain rainfall can differ sharply within it. Check local gauges and water-system records before operational decisions.

Follow the evidence

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Source snapshot
Open exact NASA request ↗
Matched comparison
30 complete baseline seasons. Same calendar months. No missing-day imputation. February 29 excluded in every year.
Calculation & limitations ↓
Portable evidence
Export source bytes, settings and results. Anyone can reproduce the calculation using this release.

Snapshot fingerprint

SHA-256 detects changes against this release’s pinned copy. It is not a NASA signature, a blockchain record or a guarantee of meteorological accuracy.

Verify a shared packet

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What the number means

Reproducible, not predictive

Sum daily corrected precipitation over your selected months. Compare that sum with the arithmetic mean of the same months in 30 baseline years, 1991–2020. All comparisons omit February 29 to use equal calendars. The displayed difference is (target − baseline mean) ÷ baseline mean × 100.

Missing means insufficient

A missing, negative or nonnumeric daily value blocks its season. The claim receives no verdict unless every target day and all 30 baseline seasons are complete. A zero baseline also blocks percentage comparison. No rain is never inferred from a missing record.

Keep the conclusion narrow

This is one source and a coarse grid, not station validation. The baseline range describes past variation; it is not a confidence interval. A rainfall difference alone does not prove drought, flooding, changing climate or the cause of water shortages.

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