New Haven, Connecticut Weather Records

The hottest and coldest days New Haven has ever recorded — and how today compares to normal

New Haven’s all-time temperature records

Hottest day on record
101°Fset July 22, 2011
Coldest day on record
-8°Fset January 19, 1948

That is a 109°F span between the hottest and coldest days New Haven has ever recorded — the full range of what its weather has done across the station’s record back to 1948.

New Haven, CT · Today vs. normal

3°F below typical for 10:15 AM on Sep 21

At 10:15 AM EDT on Sep 21 it was 60°F in New Haven — 3° below the 63°F typical for that hour (estimated from the Sep 21 normal high of 73°F and low of 55°F, interpolated from the monthly normals).

How extreme New Haven’s weather gets

New Haven’s weather is usually mild by its own standards — a typical year averages a daily high near 61°F, and the normal high for September runs about 75°F. The records sit well outside that everyday range. The hottest day on record reached 101°F in 2011 — roughly 40°F above a typical year’s average high, the kind of gap that turns an ordinary summer into a genuine heat event.

At the other end, New Haven has bottomed out at -8°F (1948). Those edges are why the today-versus-normal readout above is worth a glance: it shows where today falls between the normal and the record, so a hot afternoon can be judged against the real history rather than a hunch. A reading a few degrees over the September normal is ordinary; one pushing toward the 101°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in New Haven?
New Haven's hottest day on record reached 101°F, set on July 22, 2011. That is the single most extreme high in the nearest long-term weather station's full daily record — about 40°F hotter than a typical year's average high of 61°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.
What is the record high temperature in New Haven?
The all-time record high in New Haven is 101°F, recorded on July 22, 2011. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.
What is the coldest day ever recorded in New Haven?
New Haven's coldest day on record bottomed out at -8°F, set on January 19, 1948. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.
What is the record low temperature in New Haven?
The all-time record low in New Haven is -8°F, recorded on January 19, 1948. The gap between that and the 101°F record high — a span of 109°F — is the full range of temperatures New Haven has experienced across its long-term daily record.
Is it normal to be this hot in New Haven?
It depends on how far above New Haven's normal a given day runs. A typical year here averages a daily high near 61°F; the all-time record of 101°F (set 2011) sits about 40°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.
When did New Haven set its temperature records?
New Haven's record high of 101°F was set in 2011 (July 22, 2011), and its record low of -8°F in 1948 (January 19, 1948). Both are pulled from the station's full daily record going back to 1948, so they reflect the true extremes rather than a recent or partial sample.
Has New Haven been getting hotter?
There isn't enough station data to say: the latest stretch of complete years with no gap over 10 years is 2002–2025, only 24 years (a trend needs at least 30). The all-time records above still use every valid day in the record.