The Year in Heat & Cold
1878
-0.38°F
ran -0.38°F cooler than the 1996–2025 average across 57 cities — the 31st warmest of 157 years on record.
Extremes
Hottest Day of 1878
105.0°F
Augusta, GA · Jul 22
Coldest Day of 1878
-35.0°F
Concord, NH · Jan 8
Records Set in 1878
Daily Heat Records Set
59
calendar-day record highs set in 1878 that still stand today
Daily Cold Records Set
89
calendar-day record lows set in 1878 that still stand today
Where the Year Ran Warm & Cold
Each city's 1878 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 1878 — 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.
+0.79J
+2.44F
+4.29M
+2.52A
-2.42M
-3.10J
+0.69J
+0.09A
-1.94S
-1.55O
-0.44N
-5.85D
Warmest Stations & States
Warmest Stations of 1878
| 1 | Duluth MN | +3.69°F |
| 2 | Dubuque IA | +3.41°F |
| 3 | Portland ME | +2.20°F |
| 4 | Madison WI | +2.20°F |
| 5 | La Crosse WI | +2.07°F |
| 6 | Cincinnati OH | +2.06°F |
| 7 | Concord NH | +1.98°F |
| 8 | Bismarck ND | +1.57°F |
| 9 | Pittsburgh PA | +1.39°F |
| 10 | Minneapolis-St Paul MN | +1.38°F |
Coolest Stations of 1878
| 1 | Los Angeles Downtown CA | -4.05°F |
| 2 | San Diego CA | -3.13°F |
| 3 | Atlantic City Marina NJ | -3.12°F |
| 4 | Washington DC | -2.92°F |
| 5 | Brownsville TX | -2.34°F |
| 6 | Newark NJ | -2.34°F |
| 7 | New York-Central Park NY | -2.24°F |
| 8 | Boston MA | -2.23°F |
| 9 | Cheyenne WY | -2.16°F |
| 10 | Philadelphia PA | -1.97°F |
By State
Warmest states of 1878
Iowa+3.41°Minnesota+2.54°Maine+2.20°New Hampshire+1.98°North Dakota+1.57°Wisconsin+1.22°
Coolest states of 1878
District of Columbia-2.92°New Jersey-2.73°California-2.72°Massachusetts-2.23°Wyoming-2.16°Texas-2.06°
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