Thursday, May 28, 2026

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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

THURSDAY, MAY 28, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0412E
SUNSET: 1911E

COOLER TODAY WITH BUILDING CLOUDS AND SHOWERS THIS AFTERNOON….

Surface low pressure associated with the cold front that pushed
through late yesterday has pushed well to the east of the region
today. Meanwhile a weakening area of high pressure centered over
the U.P. of Michigan is sliding southeastward across the Great
Lakes region. Aloft, a trough is sitting over eastern Canada with
a short wave rotating around it pushing southward across New
England today. Upper level temperatures are cooling as the day
progresses, thus increasing instability across the area.

Skies started the day mainly clear early this morning, but clouds
started to pop up by mid morning. They have become more numerous
early this afternoon with the above mentioned instability. Some
scattered showers have also developed over the region.

Temperatures are cooler today than they have been the last couple
of days. Readings have pushed into the upper 60s to low 70s by
early this afternoon. Dew point values have been holding in the
mid 50s throughout the day, so overall it feels more comfortable
than yesterday.

Winds have been steady for the most part today, starting the day
out of the north-northwest, but have veered to an onshore flow by
early this afternoon. The average speed for the day so far is
around 9mph. The peak gust for the day so far occurred twice,
first around midnight, and again just after 12:30pm this
afternoon with a value of 22mph.

Visibility has been excellent all day with a view of around
60-70 miles, however it has become locally lower where rain
showers have developed.

The maximum temperature so far today is 71F degrees, which is
a degree above the normal high of 70F. The minimum temperature
since midnight is 56F degrees, which is 4 degrees above the
normal low of 52F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus distant ESE-S-W-NE
Temperature: 64F; Dew Point: 53F; Relative Humidity: 66%
Wind: N @ 5 kts, wind light
Sea-level pressure: 1009.8 mb; 29.82 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 56F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 70 098/64/53/0105/982/ FEW AC/ACC DSNT ESE-S-W-NE
WND LGT/ 8/080 51011 10064 20056

10 A.M.
Weather: Broken cumulus, broken altocumulus, cumulus fractus all
quadrants
Temperature: 67F; Dew Point: 54F; Relative Humidity: 61%
Wind: NE @ 8 kts, wind NNW variable E
Sea-level pressure: 1009.8 mb; 29.85 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E45 BKN 65 BKN 70 098/67/54/0408/982/ CUFRA ALQDS
WND 34V09/ 8/260 50000

1 P.M.
Weather: Broken cumulus, broken altocumulus, virga distant all
quadrants
Temperature: 68F; Dew Point: 54F; Relative Humidity: 60%
Wind: ENE @ 8 kts
Sea-level pressure: 1009.7 mb; 29.82 in. Hg: rising, then falling
Visibility: 60 miles
6-hr Max temp: 71F
6-hr Min temp: 64F
6-hr Precip: 0.00 inches
BHO SA 1755 E50 BKN 75 BKN 60 097/68/54/0708/982/ VIRGA DSNT ALQDS/
8/260 58001 10071 20064

————————————————————–

SUMMARY FOR WEDNESDAY, MAY 27, 2026

TEMPERATURE (DEGREES F)
MAX…….84 NORMAL…..70
MIN…….62 NORMAL…..51
MEAN……73 NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+13
TOTAL DEPARTURE FOR THE MONTH………………………+72 [+2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH (MAY)………197 DEPARTURE…….-39
TOTAL HEATING UNITS FOR THE SEASON………….6033 DEPARTURE…….-90
TOTAL HEATING UNITS LAST SEASON TO DATE……..5595 DEPARTURE……+431

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..8 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH (MAY)……….53 DEPARTURE…….+34
TOTAL COOLING UNITS FOR THE SEASON……………59 DEPARTURE…….+37
TOTAL COOLING UNITS LAST SEASON TO DATE……….14 DEPARTURE…….+45

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)………..28 N @ 10:25 P.M.
VECTOR #1 (1-Sec)……….27 NNW @ 11:48 P.M.
VECTOR #2 (1-Sec)……….26 NNW @ 11:48 P.M.
DAVIS #1……………….25 NNW @ 11:44 P.M.
DAVIS #2 ………………25 WSW @ 03:07 P.M.
RMY #1 (Instantaneous)…..28 NNW @ 11:48 P.M.
RMY #2 (Instantaneous)…..27 NNW @ 11:46 P.M.
MERLIN…………………25 N
RICHARDS (C5C) (Inst)……27 WSW @ 03:07 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NNW @ 11:48 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 NNW @ 11:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 WSW @ 03:08 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NNW @ 11:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 WSW @ 03:08 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NNW @ 11:48 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 WSW @ 03:08 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 NNW @ 11:49 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.8 WSW [260 total miles] VECTOR #1………………11.0
VECTOR #2………………11.6
DAVIS #1……………….11.3 W
DAVIS #2………………….M
RMY #1…………………10.8 W
RMY #2…………………11.3 W
RICHARDS (C5C)………….11.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH (MAY)……..1.95 DEPARTURE…..-1.33
TOTAL PRECIPITATION FOR THE YEAR (2026)…….15.62 DEPARTURE…..-6.44

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH (MAY)…………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+11.9

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1 63/43/53/0/0.00/769/91 26 WNW VEC1 27 NNW RMY 27
5/2 58/45/52/-2/0.04/127/15 29 SSW VEC1 29 SSW RMY 28
5/3 53/41/47/-7/T/119/14 37 NW VEC1 36 NW RMY 39
5/4 71/41/56/+2/0.00/775/91 46 SW VEC1 46 SW RMY 48
5/5 78/49/64/+9/0.00/718/84 43 SSW VEC1 43 SSW RMY 45
5/6 68/54/61/+6/0.08/146/17 43 SSW VEC1 42 SSW RMY 44
5/7 65/46/56/+1/0.22/697/81 28 WNW VEC1 27 WNW RMY 28
5/8 62/40/51/-4/0.00/741/86 33 W VEC1 33 W RMY 33
5/9 58/43/51/-5/0.35/000/00 30 SSW VEC1 31 SSW RMY 30
5/10 72/49/61/+5/T/346/40 28 SSW VEC1 28 SSW RMY 27
5/11 62/45/54/-2/T/191/22 26 NNW VEC1 26 NNW RMY 26
5/12 63/42/53/-4/T/835/96 29 WNW VEC1 29 WNW RMY 29
5/13 65/46/56/-1/T/122/14 41 S VEC1 40 S RMY 44
5/14 61/48/55/-2/0.26/000/00 37 SSE VEC1 38 SE RMY 36
5/15 56/47/52/-5/0.04/026/03 18 NE VEC1 19 NE RMY 20
5/16 78/47/63/+5/0.00/853/97 33 SW VEC1 34 SSW RMY 35
5/17 86/56/71/+13/0.05/827/94 39 W VEC1 38 W RMY 40
5/18 84/62/73/+15/0.00/829/94 33 SSW VEC1 32 SSW RMY 33
5/19 95/65/80/+22/0.25/716/81 47 NW VEC1 47 NW RMY 50 TSTM
5/20 89/65/77/+18/0.00/789/89 39 WNW VEC1 39 WNW RMY 41
5/21 68/52/60/+1/0.01/…/.. 22 N VEC1 22 N RMY 22
5/22 61/47/54/-5/0.00/…/.. 24 ENE VEC1 25 ENE RMY 24
5/23 62/49/56/-3/0.01/…/.. 16 NE VEC1 16 NE RMY 16
5/24 52/48/50/-10/0.52/…/.. 26 ESE VEC1 28 ESE RMY 27
5/25 74/52/63/+3/0.12/…/.. 22 WNW VEC1 22 WNW RMY 22
5/26 82/56/69/+9/0.00/…/.. 28 SSW VEC1 27 SW RMY 29
5/27 84/62/73/+13/0.00/…/.. 28 N VEC1 27 NNW RMY 28