donsutherland1

1.76" on July 18, 2012. The rain was associated with a cold front that crossed the region after the high had been reached.

Today is the first June day on record where both Newark and New York City (Central Park) had low temperatures of 80° or above. The last such occurrence was July 28, 2020. Overall, it is the 32nd such case during the common period for their records. Below is a chart showing the mean high temperature, highest maximum temperature, and lowest maximum temperature for such cases.

Newark's 81° low set a new June monthly record. The old record was 80°. That mark was set on June 28, 2010. Central Park recorded its earliest 80° low on record. The prior mark was set on June 26, 1952. A list of select records is below:

Today is on track to become New York City's 10th occurrence with a low temperature of 80° or above one day after measurable rainfall. It would be the first such occurrence in June. The list is below:

I don't believe today's light rainfall (0.10" at NYC, 0.08" at LGA and JFK, and 0.06" at Newark) will have much impact on Tuesday's high temperatures. Looking back at Central Park's long record, there were 6 100° days two days after measurable precipitation. In fact, on July 20, 1977, 0.06" rain fell. July 21, 1977 saw the mercury hit 104°. The most precipitation that fell two days before a 100° high was 0.36"; the most precipitation that fell one day before a 100° high was 0.16". The highest temperature two days after 1" or more rain was 99°; the highest temperature one day after 1" or more rain was 97°. The highest temperature two days after 2" or more rain was 95°; the highest temperature one day after 2" or more rain was 93°. Both those cases followed 3" or above rainfall. The highest temperature two days after 4" or more rain was 89°; the highest temperature one day after 4" or more rain was 87°. In short, heavier rainfall would have an impact. The light rainfall that occurred today shouldn't have much impact. The development of a sea breeze, cloud cover, and/or humidity will have a larger impact.

For reference for tomorrow:

Bridgeport reached 93 today. That tied its daily record from 1949.

JFK Airport (91°), LaGuardia Airport (90°), and Newark (92°) all reached 90° or above while Central Park (88°) did not. That was the second time this month that happened. The last month with two such days was August 2021. The record is 4 such days in June 2010. Even more impressive, Bridgeport, JFK Airport, LaGuardia Airport, Islip, and Newark all reached 90° or higher, while Central Park did not for the first time since June 17, 2022 and only the 12th time during the period of common recordkeeping. The 5° difference between Brigeport (93°) and Central Park (88°) was just 1° short of the record for all days where Bridgeport reached 90° or above and Central Park did not. That record was set on June 24, 2017: Bridgeport: 90°; Central Park: 84°. During the period of common recordkeeping, there have been 149 days when JFK reached 90° or higher and Central Park did not. In contrast, there have been 722 days when Central Park reached 90°F or higher and JFK did not. There have been 46 days when Bridgeport reached 90° or higher and Central Park did not. In contrast, there have been 663 days when Central Park reached 90°F or higher and Bridgeport did not.There have been 38 days when Islip reached 90° or higher and Central Park did not. In contrast, there have been 702 days when Central Park reached 90°F or higher and Islip did not.

Following this morning's showers and thundershowers, heat began surging into the region. Through 5 pm, highs at JFK Airport and Newark had reached 91°. Extreme heat is likely tomorrow, Tuesday, and possibly Wednesday Temperatures will likely top out in the middle and upper 90s in the New York City area and upper 90s to lower 100s in the hot spots in New Jersey during the height of the heat on Tuesday. The ECMWF and GFS continue to show potential June monthly record heat for parts of the region. June Monthly Records: Bridgeport: 97°, June 9, 2008 Islip: 96°, June 24, 1966 and June 19, 1994 New York City-Central Park: 101°, June 29, 1934 and June 27, 1966 New York City-JFK Airport: 99°, June 29, 1949, June 26, 1952, June 30, 1964 New York City-LaGuardia Airport: 101°, June 26, 1952 and June 13, 2017 Newark: 103°, June 27, 1952 June 26, 1952 is currently the hottest June day on record in and around the New York City area. Out of the five stations from the above list that were operating in 1952, three reached or exceeded 100° on June 26, 1952 (Central Park: 100°, LaGuardia Airport: 101°, and Newark: 102°). All five reached 95° or above. Two stations also saw 80° or above lows: Central Park: 81° and LaGuardia Airport: 84°. Both the number of 100° highs and 80° lows is the highest on record for June for this five-station area. For June 26, 1952, the five-station average high was 99.4°, the average low was 78.2°, and the mean was 88.4°. The average high and mean are the highest on record for June. The average low is the second highest on record for June. June 21, 2012 was the second hottest day, overall, in this region. Its average high was 96.8°. Its average low was 78.4°. Its mean was 87.6°. That average low was the highest on record for June. The average high and mean were the second highest for June. The ENSO Region 1+2 anomaly was +0.5°C and the Region 3.4 anomaly was 0.0°C for the week centered around June 11. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.30°C and the ENSO Region 3.4 anomaly has averaged -0.05°C. Neutral ENSO conditions will likely continue through at least late summer. The SOI was +8.58 yesterday. The preliminary Arctic Oscillation (AO) was +0.777 today. Based on sensitivity analysis applied to the latest guidance, there is an implied 79% probability that New York City will have a warmer than normal June (1991-2020 normal). June will likely finish with a mean temperature near 73.4° (1.4° above normal).

Manor Park in Larchmont

After this morning’s light rain and thunder.

3 pm temperatures: JFK: 86 LGA: 85 NYC: 81 EWR: 86 HPN: 86

June monthly rainfall and June monthly maximum temperature data for New York City is below:

For reference: Washington, DC's most 100° or above temperatures in June is 2. That record was set in 1874 and tied in 1959. Washington, DC's most consecutive 100° or above temperatures in June is 2: June 29-30, 1959. Washington, DC's most recent 100° day in June occurred on June 22, 2024 when the temperature reached 100°. The date with the highest number of 100° readings is June 29th with 4; Second highest is June 9th with 3. The highest temperature on record for June is 104° from June 29, 2012.

1953 ran from 8/26 through 9/3. I've added the updated chart.

JFK's extreme heat events:

The 1948 event would have been shortened to August 26-28, as there were three consecutive 100° highs.

I will check out JFK. The thresholds differ from those at Central Park.

The value is based on percentile ranking.

I believe JFK had a maximum-minimum thermometer, so the high should be accurate even if it occurred between hours.

Despite the expected extreme heat, it is possible that New York City's Central Park will fall short of the criteria needed to qualify as an extreme heat event (Clarke et al., 2014 Methodology). To get there, there would need to be at least 3 97° highs, every high during the period would need to be 90° or above, and the average high during the period would need to be 97° or above. Below is a list of such events:

The Park will be tough.

A sustained period of above normal temperatures is now underway. Excessive heat will overspread the region tomorrow with the mercury soaring into the 90s across the region. Extreme heat is likely Monday, Tuesday, and possibly Wednesday Temperatures will likely top out in the middle and upper 90s in the New York City area and upper 90s to lower 100s in the hot spots in New Jersey. The ECMWF and GFS continue to show potential June monthly record heat for parts of the region. June Monthly Records: Bridgeport: 97°, June 9, 2008 Islip: 96°, June 24, 1966 and June 19, 1994 New York City-Central Park: 101°, June 29, 1934 and June 27, 1966 New York City-JFK Airport: 99°, June 29, 1949, June 26, 1952, June 30, 1964 New York City-LaGuardia Airport: 101°, June 26, 1952 and June 13, 2017 Newark: 103°, June 27, 1952 June 26, 1952 is currently the hottest June day on record in and around the New York City area. Out of the five stations from the above list that were operating in 1952, three reached or exceeded 100° on June 26, 1952 (Central Park: 100°, LaGuardia Airport: 101°, and Newark: 102°). All five reached 95° or above. Two stations also saw 80° or above lows: Central Park: 81° and LaGuardia Airport: 84°. Both the number of 100° highs and 80° lows is the highest on record for June for this five-station area. For June 26, 1952, the five-station average high was 99.4°, the average low was 78.2°, and the mean was 88.4°. The average high and mean are the highest on record for June. The average low is the second highest on record for June. June 21, 2012 was the second hottest day, overall, in this region. Its average high was 96.8°. Its average low was 78.4°. Its mean was 87.6°. That average low was the highest on record for June. The average high and mean were the second highest for June. The ENSO Region 1+2 anomaly was +0.5°C and the Region 3.4 anomaly was 0.0°C for the week centered around June 11. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.30°C and the ENSO Region 3.4 anomaly has averaged -0.05°C. Neutral ENSO conditions will likely continue through at least late summer. The SOI was +2.11 yesterday. The preliminary Arctic Oscillation (AO) was +0.206 today. Based on sensitivity analysis applied to the latest guidance, there is an implied 84% probability that New York City will have a warmer than normal June (1991-2020 normal). June will likely finish with a mean temperature near 73.8° (1.8° above normal).

A number of charts and tables for reference for what appears likely to be a notable and perhaps historic bout of June heat: EFI: June 23, 2025: EFI: June 24, 2025: NWS Heat Risk: June 23, 2025: NWS Heat Risk: June 24, 2025: June Monthly Records: June 1-Day, 2-Day, 3-Day Records: Select Additional Data: June Extremes:

Yes. I fixed my post as I accidentally omitted 1983 and 2010.