4 Billion Years On

North America Climate Update

Aggregated from country snapshots — NOAA does not publish a NA continental series

This is a 4BYO aggregate. NOAA does not publish a standalone continental land series for North America, so we average country anomalies in our coverage. See methodology.

Generating North America climate update…

Latest temperature anomaly

1-month (Mar 2026)
+1.70 °C
vs 1961–1990
3-month rolling
+1.65 °C
vs 1961–1990
12-month (Apr 2025 – Mar 2026)
+1.81 °C
vs 1961–1990

4BYO aggregate (NOAA does not publish a standalone continental land series for this region)

Monthly temperature anomaly history

4BYO aggregate of country anomalies vs the 1961–1990 baseline.

North America – Monthly Temperature – All Years

Each line represents one year of monthly mean temperatures.

All years since 19872025 (warmest)2026 (current year)

4BYO continent aggregate · equal-weight mean of 6 country monthly absolute temperatures (OWID/CRU TS).

Shifting Seasons

Warm / cold seasons

How spring and autumn have shifted in North America. Spring is defined as the date monthly temperatures first rise above the long-term annual mean (15.9°C, from 19411970); autumn is the date they fall back below it. Temperature swings 12.8°C peak-to-peak across the year - a classic four-seasons rhythm.

1941–1970
6.6
months above annual mean
2016–2025
7.0
months above annual mean
Spring & Autumn shift
+24 days longer
Warm season
1941–1970 baseline: 15 Apr → 23 Oct · 191 days
2016–2025 now: 4 Apr → 5 Nov · 215 days
J
F
M
A
M
J
J
A
S
O
N
D
Spring 11 days earlier · Autumn 13 days later

Baseline vs recent monthly temperature climatology. Biggest warming: Jan (+1.9°C).

4BYO continent aggregate · OWID/CRU TS country monthly temperatures.

Member countries (6)

These are the country snapshots aggregated into the North America series.

Hottest & Coolest in North America this month

1-month anomaly vs 1961–1990 across the 6 members we cover. Click a name to open its profile.

Warmest

  1. 1.🇺🇸United States+3.29°C
  2. 2.🇲🇽Mexico+2.04°C
  3. 3.🇯🇲Jamaica+1.58°C
  4. 4.🇨🇦Canada+1.40°C
  5. 5.🇳🇮Nicaragua+1.12°C

Coolest

  1. 1.🇨🇷Costa Rica+0.74°C
  2. 2.🇳🇮Nicaragua+1.12°C
  3. 3.🇨🇦Canada+1.40°C
  4. 4.🇯🇲Jamaica+1.58°C
  5. 5.🇲🇽Mexico+2.04°C

Data source

  • 4BYO aggregate (NOAA does not publish a standalone continental land series for this region)
  • Two-baseline model — comparison baseline 1961–1990; native baseline 1961-1990. Methodology →

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