What moves with heat?

Inspect Pearson and Spearman results, sample size, and the caveats that keep association from becoming a causal claim.

Phoenix, Arizona

15 Jul 2025 · 16:00 MST

VariableSpatial filterTime filter

Scatter plot

Temperature ↔ Built-up density

0.66

Pearson r · N 30

Positive · StrongSpearman ρ = 0.74 · Peak hour

Correlation matrix

Linear association

Accessible data table

All matched variables

Scenario associations

Variable	Pearson r	Spearman ρ	N	Association
Built-up density	0.66	0.74	30	Positive · Strong
Vegetation cover	-0.06	-0.04	30	Negative · Very weak
Impervious surface	0.66	0.75	30	Positive · Strong
Road density	0.27	0.20	30	Positive · Weak
Population density	0.36	0.43	30	Positive · Weak
Relative humidity	-0.33	-0.27	30	Negative · Weak

Correlation does not imply causation. Season, time of day, humidity, elevation, land use, weather, and urban morphology are plausible confounders. Demo temperature was generated from urban variables; the coefficients demonstrate pipeline behavior, not an empirical Phoenix discovery.

PHOENIX SCENARIO

Track 07 · Analysis & correlation