A dangerous heat wave, one of which that likely hasn't impacted the North Country in decades occurred between June 30th and July 5th. High temperatures exceeded 90 degrees for at least 5 of the six days in many locations were above 85 degrees for 7 days.
Heat indices, the combination of temperature and humidity, were recorded in the 100 to 110 range considered excessive and very dangerous. A substantial increase in hospitalizations occurred due to the excessive heat and duration.
A weak disturbance moving across a very hot and humid air mass on July 2nd initiated isolated thunderstorms, one of which that produced very localized wind damage. Similarly, one isolated thunderstorm produced a brief downburst at NY Mesonet site on July 5th with no reported damage.

Heat in EASTERN CLINTON, NEW YORK
From 01-JUL-18 00:00:00 to 06-JUL-18 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High temperatures in the upper 80s to upper 90s with dewpoints in the 60s and 70s created dangerous heat indices in the 95 to 110 degree range between June 30th and July 5th.

Heat in NORTHERN FRANKLIN, NEW YORK
From 01-JUL-18 00:00:00 to 06-JUL-18 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High temperatures in the upper 80s to upper 90s with dewpoints in the 60s and 70s created dangerous heat indices in the 95 to 110 degree range between June 30th and July 5th.

Heat in NORTHERN ST. LAWRENCE, NEW YORK
From 01-JUL-18 00:00:00 to 06-JUL-18 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High temperatures in the upper 80s to upper 90s with dewpoints in the 60s and 70s created dangerous heat indices in the 95 to 110 degree range between June 30th and July 5th.

Heat in SOUTHWESTERN ST. LAWRENCE, NEW YORK
From 01-JUL-18 00:00:00 to 06-JUL-18 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High temperatures in the upper 80s to upper 90s with dewpoints in the 60s and 70s created dangerous heat indices in the 95 to 110 degree range between June 30th and July 5th.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 02-JUL-18 16:45:00 to 02-JUL-18 16:45:00 (EST-5)
Location: SANTA CLARA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A Tree and several large limbs downed by brief thunderstorm winds along Route 458 in Santa Clara.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 02-JUL-18 16:50:00 to 02-JUL-18 16:50:00 (EST-5)
Location: DUANE CENTER
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

Tree and wires down along Route 26.

Thunderstorm Wind in CLINTON, NEW YORK
From 05-JUL-18 17:05:00 to 05-JUL-18 17:05:00 (EST-5)
Location: CHAZY
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured at NY State Mesonet site.

Heat in EASTERN ESSEX, NEW YORK
From 01-JUL-18 00:00:00 to 06-JUL-18 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High temperatures in the upper 80s to upper 90s with dewpoints in the 60s and 70s created dangerous heat indices in the 95 to 110 degree range between June 30th and July 5th.