2021

+1.06°F

ran +1.06°F warmer than the 1996–2025 average across 384 cities — the 153rd coldest of 157 years on record.

Extremes

-48.0°F

Bettles, AK · Feb 19

123.0°F

Palm Springs, CA · Jun 17

486

calendar-day record lows set in 2021 that still stand today

1,762

calendar-day record highs set in 2021 that still stand today

Each city's 2021 average temperature versus its 1996–2025 normal — blue where the year ran cool, red where it ran hot.

Each city's single hottest and coldest reading of 2021 — the number is the temperature, coloured hot-to-cold. Toggle between the two.

National temperature anomaly by month — red above the line is a warm month, blue below is cool.

+2.31J

-3.95F

+1.99M

+0.15A

-0.68M

+2.25J

+0.30J

+1.19A

+0.96S

+2.73O

+0.03N

+4.76D

Warmest states of 2021

South Dakota+2.90°North Dakota+2.82°Minnesota+2.18°Idaho+2.14°Michigan+2.11°Vermont+2.06°

Coolest states of 2021

Alaska-1.21°Guam+0.05°Oklahoma+0.20°South Carolina+0.21°Texas+0.25°Alabama+0.26°

Coldest Since · Browse all states · See where it's hottest → hottestsince.com
part of Weather Trader · supported by Substack Subscribers · data: NWS NDFD forecast + NOAA/ACIS ThreadEx records · updated 2026-07-12 22:52Z
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