The Year in Heat & Cold
1870
-1.31°F
ran -1.31°F cooler than the 1996–2025 average across 5 cities — the 80th warmest of 157 years on record.
Extremes
Hottest Day of 1870
100.0°F
Concord, NH · Jul 24
Coldest Day of 1870
-22.0°F
Lansing, MI · Feb 21
Records Set in 1870
Daily Heat Records Set
12
calendar-day record highs set in 1870 that still stand today
Daily Cold Records Set
7
calendar-day record lows set in 1870 that still stand today
Where the Year Ran Warm & Cold
Each city's 1870 average temperature versus its 1996–2025 normal — blue where the year ran cool, red where it ran hot.
Hottest & Coldest at Every City
Each city's single hottest and coldest reading of 1870 — the number is the temperature, coloured hot-to-cold. Toggle between the two.
Month by Month
National temperature anomaly by month — red above the line is a warm month, blue below is cool.
+1.40J
-4.50F
-7.45M
-0.49A
+0.42M
+1.69J
+0.36J
-0.99A
-1.03S
-0.88O
-1.21N
-4.06D
Warmest Stations & States
Warmest Stations of 1870
| 1 | Concord NH | +1.31°F |
| 2 | Madison WI | +0.17°F |
| 3 | New York-Central Park NY | -1.70°F |
| 4 | Lansing MI | -3.08°F |
| 5 | Newark NJ | -3.25°F |
Coolest Stations of 1870
| 1 | Newark NJ | -3.25°F |
| 2 | Lansing MI | -3.08°F |
| 3 | New York-Central Park NY | -1.70°F |
| 4 | Madison WI | +0.17°F |
| 5 | Concord NH | +1.31°F |
By State
Warmest states of 1870
New Hampshire+1.31°Wisconsin+0.17°New York-1.70°Michigan-3.08°New Jersey-3.25°
Coolest states of 1870
New Jersey-3.25°Michigan-3.08°New York-1.70°Wisconsin+0.17°New Hampshire+1.31°
Hottest Since · Browse all states · See where it's coldest → coldestsince.com
part of Weather Trader · supported by Substack Subscribers · data: NWS NDFD forecast + NOAA/ACIS ThreadEx records · updated 2026-07-12 22:52Z
© 2026 Weather Trader · All rights reserved
part of Weather Trader · supported by Substack Subscribers · data: NWS NDFD forecast + NOAA/ACIS ThreadEx records · updated 2026-07-12 22:52Z
© 2026 Weather Trader · All rights reserved