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📊 Climate Graphs

Temperature as a line, rain as bars, months across the bottom. Learn to read climographs, climate normals, and the jump from pattern to Köppen regime.

lessons

~16 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Two signals, one yearIdentify what a climate graph plots and how temperature and precipitation share the month axis.A climograph pairs a temperature line with precipitation bars across twelve months. Legend and units control the reading before any interpretation starts.
Normals, not tomorrowDistinguish weather from climate and explain what a 30-year climate normal represents.Weather is short-term atmosphere. Climate is the long-term pattern. Official U.S. normals average a uniform 30-year window — currently 1991–2020 — as a ruler for typical conditions, not a forecast for tomorrow.
Read the shapeExtract annual temperature range and wet–dry season timing from a climograph before naming a climate type.Scan the temperature curve for range and seasonality, then the bars for when rain concentrates. Hemisphere flips which months are summer; dual axes demand a legend check.
From graph to regimeConnect monthly temperature and precipitation patterns to a Köppen-style climate regime and practice with a local normals chart.Köppen groups climates with monthly temperature and precipitation thresholds into A–E types. The graph is evidence; the letter code is a label. End by reading your own station's normals.

Questions this course answers

On a typical climate graph, what does the horizontal axis usually show?

Climographs arrange temperature and precipitation across the twelve months so seasonal patterns are visible.

How are temperature and precipitation usually drawn on a climograph?

Standard school and atlas climographs pair a temperature curve with precipitation bars on dual vertical scales.

What is an official climate normal in WMO and NOAA practice?

NOAA's U.S. Climate Normals use a uniform 30-year window (currently 1991–2020) as the standard reference.

Why should you not treat a July mean on a climate graph as next Tuesday's weather?

Weather varies day to day; climograph values summarize long-period averages used as a comparison ruler.

What monthly data does the Köppen system primarily use to assign climate groups?

Köppen classification is built from thresholds and seasonality in monthly temperature and precipitation.

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