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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JUNE 30, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1925E
FILTERED SUNSHINE GIVES WAY TO INCREASING CLOUDS, BECOMING WARMER
AND MORE HUMID….
Skies started the day off on the clear side, although wildfire
smoke was observed aloft filtering the sun a bit. Some cirrus
clouds have been floating overhead through the day as well. By
early this afternoon cumulus and altocumulus clouds joined the
mix and became more numerous thanks to the day-time heating
making the atmosphere more unstable.
Temperatures have continued their gradual climb as we head
toward a heat-wave which will likely start tomorrow. Readings
today has reached the upper 80s. Dew point values have also
risen from the mid 60s through morning to now nearing 70F
after the 1pm observation.
The wind hasn’t been as light today as the past few days. A
southerly flow has been averaging at around 9mph. The peak
gust so far today is 23mph which occurred after 1pm this
afternoon.
Visibility has been limited again today due to haziness. The
view has been holding between 25-30 miles all day.
The maximum temperature so far today is 88F, which is 8 degrees
above the normal high of 80F. The minimum temperature since
midnight is 65F, which is 3 degrees above the normal low of 62F.
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Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus/castellanus distant SE-W-NW, few cirrus,
smoke layer aloft
Temperature: 72F; Dew Point: 66F; Relative Humidity: 82%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1020.9 mb; 30.15 in. Hg: rising, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 65F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 25 209/72/66/2104/015/ FEW AC/ACC DSNT SE-W-NW FEW CI ALQDS
K LYR ALF ALQDS HAZY WND LGT/ 8/081 51004 10072 20065
10 A.M.
Weather: Clear, few cirrus, smoke layer aloft
Temperature: 83F; Dew Point: 67F; Relative Humidity: 58%
Wind: S @ 6 kts, wind light
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: falling, then more slowly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 25 200/83/67/1906/012/ FEW CI ALQDS K LYR ALF ALQDS HAZY
WND LGT/ 8/001 56009
1 P.M.
Weather: Broken cumulus, broken altocumulus, broken cirrus/cirrocumulus,
smoke layer aloft
Temperature: 86F; Dew Point: 66F; Relative Humidity: 52%
Wind: S @ 10G18 kts
Sea-level pressure: 1017.9 mb; 30.06 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 72F
6-hr Precip: 0.00 inches
BHO SA 1755 E50 BKN 75 BKN 250 BKN 30 179/86/66/1810G18/006/ K LYR ALF ALQDS
HAZY/ 8/259 58021 10088 20072
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SUMMARY FOR MONDAY, JUNE 29, 2026
TEMPERATURE (DEGREES F)
MAX…….82 NORMAL…..80
MIN…….62 NORMAL…..62
MEAN……72 NORMAL…..71
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH……………………..+113 [+3.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH (JUN)……….17 DEPARTURE…….-48
TOTAL HEATING UNITS FOR THE SEASON………….6084 DEPARTURE……-126
TOTAL HEATING UNITS LAST SEASON TO DATE……..5665 DEPARTURE……+419
COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..7 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH (JUN)………168 DEPARTURE…….+63
TOTAL COOLING UNITS FOR THE SEASON…………..227 DEPARTURE…….+94
TOTAL COOLING UNITS LAST SEASON TO DATE………187 DEPARTURE…….+40
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences
F420C (Official)………..18 W @ 01:56 P.M.*
VECTOR #1 (1-Sec)……….19 WNW @ 02:36 A.M.
VECTOR #2 (1-Sec)……….19 ENE @ 02:11 P.M.
DAVIS #1……………….19 W @ 02:36 A.M.
DAVIS #2 ………………19 E @ 01:56 P.M.
RMY #1 (Instantaneous)…..20 ENE @ 01:55 P.M.
RMY #2 (Instantaneous)…..20 ENE @ 01:56 P.M.
MERLIN…………………18 E
RICHARDS (C5C) (Inst)……19 WNW @ 02:36 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 W @ 03:10 A.M.*
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 W @ 02:26 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 WNW @ 03:10 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 ENE @ 01:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 NW @ 03:10 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 ENE @ 01:56 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WNW @ 03:10 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 ENE @ 01:56 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.9 ENE [189 total miles]
VECTOR #1……………….8.4
VECTOR #2……………….8.9
DAVIS #1………………..8.7 E
DAVIS #2………………..8.6 E
RMY #1………………….8.5 ENE
RMY #2………………….8.9 ENE
RICHARDS (C5C)…………..8.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH (JUN)……..1.86 DEPARTURE…..-2.64
TOTAL PRECIPITATION FOR THE YEAR (2026)…….18.66 DEPARTURE…..-8.44
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
6/1 60/45/53/-9/T/606/67 26 ENE VEC1 27 ENE RMY 27
6/2 75/45/60/-2/0.00/680/75 22 NNW VEC1 22 NNW RMY 21
6/3 82/56/69/+7/0.00/880/97 28 S VEC1 28 S RMY 29
6/4 88/57/73/+10/0.00/817/90 23 WNW VEC1 23 SW RMY 23
6/5 87/60/74/+11/0.00/810/89 20 NW VEC1 19 NW RMY 21
6/6 86/64/75/+12/0.09/282/31 46 WSW VEC1 45 WSW RMY 48 TSTM
6/7 78/55/67/+3/0.26/446/49 38 NE VEC1 38 NE RMY 42 TSTM
6/8 77/52/65/+1/0.00/904/99 20 SW VEC1 20 SW RMY 21
6/9 83/56/70/+6/0.00/886/97 28 W VEC1 27 W RMY 30
6/10 88/59/74/+9/0.00/686/75 30 SSW VEC1 30 SSW RMY 30
6/11 90/64/77/+12/0.10/631/69 22 WNW VEC1 22 WNW RMY 23
6/12 91/74/83/+18/0.00/412/45 21 WNW VEC1 21 WNW RMY 22
6/13 87/68/78/+12/0.00/769/84 36 NW VEC1 36 NW RMY 38
6/14 88/65/77/+11/0.00/495/54 33 SSW VEC1 32 SSW RMY 34
6/15 82/61/72/+6/0.00/577/63 28 SSW VEC1 28 SSW RMY 28
6/16 77/54/66/-1/0.00/898/98 22 W VEC1 22 W RMY 22
6/17 80/57/69/+2/0.00/697/76 25 SSW VEC1 24 SSW RMY 26
6/18 76/60/68/+1/0.64/193/21 51 S VEC1 52 SSW RMY 54
6/19 78/60/69/+1/0.00/880/96 41 W VEC1 40 W RMY 41
6/20 77/60/69/+1/0.00/807/88 40 WNW VEC1 39 WNW RMY 40 TSTM
6/21 82/58/70/+2/0.00/853/93 24 WNW VEC1 24 NW RMY 25
6/22 77/60/69/0/0.39/266/29 31 SSE VEC1 31 SSE RMY 31
6/23 68/62/65/-4/0.30/000/00 28 S VEC1 28 S RMY 28
6/24 81/59/70/+1/0.00/816/89 28 W VEC1 27 W RMY 27
6/25 82/60/71/+1/0.00/879/96 20 WNW VEC1 20 SSW RMY 20
6/26 76/63/70/0/0.06/211/23 23 SSW VEC1 23 SSW RMY 23
6/27 78/63/71/+1/0.01/669/73 17 ENE VEC1 17 NE RMY 18
6/28 79/61/70/0/T/439/48 16 SSW VEC1 16 SSW RMY 17
6/29 82/62/72/+1/0.00/796/87 18 W VEC1 19 WNW RMY 20
6/30 The low since midnight is 65F, the daily normal low is 62F.
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JUNE DAILY RECORDS TO DATE
6/12 NEW RECORD HIGH MINIMUM TEMPERATURE OF 74F;
BEATING OLD RECORD OF 69F SET IN 1942 AND 2017
6/18 RECORD PEAK WIND GUST OF 51 MPH,
BEATING THE OLD RECORD OF 48e MPH SET IN 1943
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957
RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH]
PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH]
PEAK GUST 52 MPH WNW IN 1974
TODAY’S REPORT PREPARED BY: Matt Douglas
