Climate Graph Worksheet Generator
Makes the twelve-month climate data for one or two invented places — mean temperature to a tenth of a degree and rainfall in millimetres — and draws the classic climate graph: rainfall as bars on the left axis, temperature as a line on the right. Pupils read off the warmest and coolest months, the annual range, the mean, the total rainfall and the wettest and driest months, and work out which hemisphere the place is in. Or print empty axes and let them draw the graph from the table. Every answer is worked from the printed figures.
What this generator does
Gives unlimited climate-graph practice from data that is clearly invented, with both graphs of a comparison drawn on the same axes and an answer key that matches the printed numbers exactly.
How to use this tool
- Choose one place or two to compare, a hemisphere and a rainfall pattern, or leave them random.
- Tick 'Pupils draw the graph' to print empty axes beside the table; the answer page then shows the finished graph.
- Press Make climate data, check the answers, and print the two pages.
Understanding the controls
- Places
- One place, or two drawn on the same axes with a comparison question.
- Hemisphere
- Northern (warmest around July), southern (warmest around January) or random.
- Rainfall pattern
- Spread through the year, wettest in the warm months, wettest in the cool months, dry all year, or any.
- Pupils draw the graph
- Prints empty axes with the table instead of the finished graph.
- Paper and seed
- Paper size and density for printing; a seed rebuilds the same places while the generator is unchanged.
Worked examples
- Seed 'harbour', two places
- Kestrel Bay (southern, wettest in the cool months): warmest Jan 26.7 °C, coolest Jul 9.7 °C, range 17.0 °C, mean 18.1 °C, 738 mm of rain. Tallis Point (southern, dry): range 21.4 °C, mean 9.3 °C, 60 mm. Kestrel Bay has the wetter year; Tallis Point the larger range.
Common use cases
- Geography lessons on reading and drawing climate graphs
- Mean, range and totals practice with a context
- Comparing hemispheres without implying anything about a real city
How this generator works
Temperatures follow an annual mean plus a cosine-shaped seasonal swing peaking in July (north) or January (south), with up to 0.6 °C of noise. Rainfall follows one of four patterns — even, wettest in the warm months, wettest in the cool months, or dry — with noise. A place is kept only when the share of rain in its six warmest months, read back from the printed numbers, matches its stated pattern. Means are summed in tenths of a degree so rounding cannot drift.
Randomness and fairness
Model settings, noise and place names are drawn with the browser's cryptographically secure generator, or from one seeded draw when a seed is typed. Answers are computed from the printed values. Seeded sheets are deterministic, not cryptographic.
For how randomness is produced across the whole site, see how Generate Random works.
Limitations and good to know
- The places and every figure are invented from a simple model. They resemble climate data but are not observations of any real town, and the four rainfall patterns are teaching labels, not a climate classification.
- Monthly means only: no extremes, sunshine, snow or year-to-year variation.
- Where two months tie for wettest, driest, warmest or coolest, the key names the earlier month and says so.
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