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Saturday, May 23, 2026

May 23, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, MAY 23, 2026 ALL TIMES ARE…

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

SATURDAY, MAY 23, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0416E
SUNSET:  1907E

HIGH PRESSURE REMAINS IN CONTROL, CLOUDY AND COOL….

High pressure remains in control over New England today.
This is preventing any of the precipitation associated with
a storm to our west from reaching us quite yet. There
are plenty of clouds though, with a cirrostratus overcast and
increasing coverage of altostratus as the day has progressed.

With an onshore flow, temperatures remain cool. The morning low was
49F, and we have only risen into the low 60s since. The dew point is
slowly climbing as well, going from the low 40s this morning to
the upper 40s by the 1pm observation.

With high pressure in place, it is perhaps no surprise that winds
have been light. The average speed so far is 7mph, now out of the
east-northeast. The peak gust occurred around 8am, with an approximate
speed of 16mph.

Visibility has fallen a touch from 60 miles to 40 miles, mainly
as a result of a moistening airmass and a gradual lowering of the
cloud deck.

The maximum temperature so far today is 62F degrees, which is 7
degrees below the normal high of 69F. The minimum temperature since
midnight is 49F degrees, which is 1 degree below the normal low
of 50F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered altostratus, overcast cirrostratus,
sun dimly visible
Temperature: 55F; Dew Point: 42F; Relative Humidity: 62%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1032.7 mb; 30.50 in. Hg: rising unsteadily
Visibility: 60 miles
6-hr Max temp: 55F
6-hr Min temp: 49F
24-hr Precip: 0.00 inches
BHO SA 1155 170 SCT E220 OVC 60 327/55/42/0405/050/ SUN DMLY VSBL
WND LGT/ 8/027 52017 10055 20049

10 A.M.
Weather: Broken altostratus, overcast cirrostratus,
sun dimly visible
Temperature: 60F; Dew Point: 46F; Relative Humidity: 59%
Wind: E @ 5 kts, wind light
Sea-level pressure: 1034.0 mb; 30.53 in. Hg: rising unsteadily
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E170 BKN 220 OVC 50 340/60/46/0905/053/ SUN DMLY VSBL
WND LGT/ 8/027 52013

1 P.M.
Weather: Overcast altostratus
Temperature: 61F; Dew Point: 48F; Relative Humidity: 63%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 1033.7 mb; 30.53 in. Hg: rising, then falling
Visibility: 40 miles
6-hr Max temp: 62F
6-hr Min temp: 55F
6-hr Precip: 0.00 inches
BHO SA 1755 E170 OVC 40 337/61/48/0705/053/ WND LGT/ 8/02/
58003 10062 20055

————————————————————–

SUMMARY FOR FRIDAY, MAY 22, 2026

TEMPERATURE (DEGREES F)
MAX…….61   NORMAL…..68
MIN…….47   NORMAL…..50
MEAN……54   NORMAL…..59

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………+58 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….11  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH (MAY)………171  DEPARTURE…….-33
TOTAL HEATING UNITS FOR THE SEASON………….6007  DEPARTURE…….-84
TOTAL HEATING UNITS LAST SEASON TO DATE……..5555  DEPARTURE……+452

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH (MAY)……….41  DEPARTURE…….+28
TOTAL COOLING UNITS FOR THE SEASON……………47  DEPARTURE…….+31
TOTAL COOLING UNITS LAST SEASON TO DATE……….14  DEPARTURE…….+33

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)………..24 ENE  @   08:32 A.M.
VECTOR #1 (1-Sec)……….25 ENE  @   08:31 A.M.
VECTOR #2 (1-Sec)……….26 ENE  @   09:10 A.M.
DAVIS #1……………….25 E    @   09:21 A.M.
DAVIS #2 ………………26 E    @   09:10 A.M.
RMY #1 (Instantaneous)…..24 ENE  @   08:22 A.M.
RMY #2 (Instantaneous)…..26 ENE  @   09:10 A.M.
MERLIN…………………21 NE
RICHARDS (C5C) (Inst)……23 ENE  @   08:22 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 E    @   09:40 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 E    @   09:43 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 E    @   09:43 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 E    @   09:43 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 E    @   09:43 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 E    @   09:43 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 E    @   09:43 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 E    @   09:43 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.3 NE [199 total miles] VECTOR #1……………….8.6
VECTOR #2……………….9.1
DAVIS #1………………..8.7 E
DAVIS #2………………..8.8 E
RMY #1………………….8.5 E
RMY #2………………….9.0 ENE
RICHARDS (C5C)…………..8.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH (MAY)……..1.30 DEPARTURE…..-1.32
TOTAL PRECIPITATION FOR THE YEAR (2026)…….14.97 DEPARTURE…..-6.43

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 The low since midnight is 49F, the daily normal low is 50F.

————————————————————–

MAY DAILY RECORDS TO DATE

5/19 RECORD HIGH MAXIMUM TEMPERATURE OF 95F,
BEATING THE PREVIOUS RECORD OF 91F SET IN 1962

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR MAY 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 1.60 INS IN 1919
PEAK GUST 49e MPH W IN 1945

RECORDS FOR MAY 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

TODAY’S REPORT PREPARED BY: Joshua Polen

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