#30DayChartChallenge 2026

30 charts. 30 days. 5 categories. One April.

A complete gallery of all 30 data visualizations created for the #30DayChartChallenge 2026. Each chart explores a daily prompt across five categories — Comparisons, Distributions, Relationships, Timeseries, and Uncertainties — built entirely in R with ggplot2.

Every April, the #30DayChartChallenge brings together practitioners from around the world to explore data through daily visualizations — one chart per day, guided by thematic prompts. This is my 2026 edition: 30 analytical charts, built entirely in R with ggplot2, across five categories. Each entry links to the full post with code, data sources, and methodology notes.

30

Charts

5

Categories

30

Days

R

Built with

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Comparisons  · Days 01–06

01 · Part-to-Whole

Where Does $7 Trillion Go?

02 · Pictogram

Norway Runs on Water. India Runs on Coal.

03 · Mosaic

The Energy Transition Is Uneven

04 · Slope

Whose Grid Got Cleaner?

05 · Experimental

Same Income Group, Very Different Power Systems

06 · RSF Data Day

A Decade of Divergence in Press Freedom

Distributions  · Days 07–12

07 · Multiscale

The Energy Transition Looks Different at Every Scale

08 · Circular

The Flu Season Clock

09 · Wealth

From Survival to Stability

10 · Pop Culture

Horror Films Are Lottery Tickets

11 · Physical

Different Failure Modes, Different Timelines

12 · FlowingData Theme Day

Distance from Normal

Relationships  · Days 13–18

13 · Ecosystems

One Intervention, System-Wide Impact

14 · Trade

Global Trade Connects Regions Through a Few Dominant Product Flows

15 · Correlation

Fossil Dependence Rises Through Middle Income — Then Breaks Down at High Income

16 · Causation

The Crime Wave May Have Been Written in 1970

17 · Remake

The Holiday-Volatility Paradox

18 · UNICEF Data Day

As Child Mortality Falls, Risk Concentrates at Birth

Timeseries  · Days 19–24

19 · Evolution

Renewables Became the Cheapest Source of Electricity

20 · Global Change

Three Signals, One Direction

21 · Historical

A Century of Stagnation. Four Decades of Change.

22 · New Tool

The Uneven Race to Renewables

23 · Seasons

The Planet Still Breathes

24 · SCMP Theme Day

Coal Falls. Renewables Rise.

Uncertainties  · Days 25–30

25 · Space

Most Exoplanets Are Still a Blur

26 · Trend

We Know Where We've Been. Where We Go Is a Choice.

27 · Animation

Energy Transitions Are Not Smooth

28 · Modeling

One Future Does Not Exist

29 · Monochrome

When Warmth Stops Looking Exceptional

30 · GHDx Data Day

The Confidence Cascade

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Built with R & ggplot2 · Visualized by Steven Ponce · GitHub