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Wednesday, May 27, 2026

May 27, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, MAY 27, 2026 ALL TIMES ARE…

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

WEDNESDAY, MAY 27, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0413E
SUNSET:  1910E

CONTINUED WARM TEMPERATURES WITH INCREASING HIGH CLOUDS….

The weak area of high pressure that moved over the region
yesterday has pushed well to the east today. A cold front is
currently pushing through the region this afternoon with little
activity associated with it, more or less just a wind shift.

Today featured a mix of sun and clouds through the morning, but
the clouds have thickened early this afternoon. As such the sun is
now quite filtered and not shining enough to burn our sun card.

Temperatures have again warmed into the low to mid 80s this
afternoon, which is again more than 10 degrees above the normal.
Dew point values have been creeping up today ahead of the cold
front, with values rising from the mid 50s to the low 60s. So
it does feel a bit humid out there this afternoon.

Winds have been fairly steady through the day, generally out
of the west-southwest. The average speed for the day so far is
around 11mph. The peak gust for the day so far is 25mph, which
occurred just before 1pm this afternoon.

Visibility has been limited today due to increasing haziness.
We started with a view of around 60 miles early this morning,
but it lowered to around 40 miles by early this afternoon.

The maximum temperature so far today is 84F degrees, which is 14
degrees above the normal high of 70F. The minimum temperature
since midnight is 62F degrees, which is 11 degrees above the
normal low of 51F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus, few cirrocumulus all quadrants
Temperature: 68F; Dew Point: 57F; Relative Humidity: 68%
Wind: W @ 9 kts
Sea-level pressure: 1012.3 mb; 29.89 in. Hg: rising, then falling
Visibility: 50 miles, hazy
6-hr Max temp: 68F
6-hr Min temp: 62F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -OVC 50 123/68/57/2609/989/ FEW CC ALQDS
HAZY/ 8/009 58002 10068 20062

10 A.M.
Weather: Broken altocumulus/altostratus, broken cirrus
Temperature: 81F; Dew Point: 60F; Relative Humidity: 49%
Wind: W @ 7 kts
Sea-level pressure: 1010.9 mb; 29.85 in. Hg: falling, then more rapidly
Visibility: 50 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E160 BKN 250 BKN 50 109/81/60/2607/985/ HAZY/
8/071 58014

1 P.M.
Weather: Broken cirrus, few cumulus distant WSW-NNE
Temperature: 81F; Dew Point: 61F; Relative Humidity: 50%
Wind: WSW @ 9G17 kts
Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 68F
6-hr Precip: 0.00 inches
BHO SA 1755 E250 BKN 40 086/81/61/2509G17/978/ FEW CU DSNT WSW-NNE
HAZY/ 8/204 56023 10084 20068

————————————————————–

SUMMARY FOR TUESDAY, MAY 26, 2026

TEMPERATURE (DEGREES F)
MAX…….82   NORMAL…..69
MIN…….56   NORMAL…..51
MEAN……69   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9
TOTAL DEPARTURE FOR THE MONTH………………………+59 [+2.1 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…….-33
TOTAL HEATING UNITS FOR THE SEASON………….6033  DEPARTURE…….-84
TOTAL HEATING UNITS LAST SEASON TO DATE……..5595  DEPARTURE……+431

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH (MAY)……….45  DEPARTURE…….+28
TOTAL COOLING UNITS FOR THE SEASON……………51  DEPARTURE…….+31
TOTAL COOLING UNITS LAST SEASON TO DATE……….14  DEPARTURE…….+37

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 SSW  @   06:17 P.M.
VECTOR #1 (1-Sec)……….27 SW   @   06:52 P.M.
VECTOR #2 (1-Sec)……….29 SW   @   06:54 P.M.
DAVIS #1……………….27 S    @   04:21 P.M.
DAVIS #2 ………………30 S    @   04:22 P.M.
RMY #1 (Instantaneous)…..29 SW   @   06:52 P.M.
RMY #2 (Instantaneous)…..29 SW   @   06:54 P.M.
MERLIN…………………26 SSW
RICHARDS (C5C) (Inst)……27 SW   @   06:54 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW   @   06:57 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 SW   @   06:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 SW   @   06:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SW   @   06:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S    @   04:23 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 SW   @   06:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 SW   @   06:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 S    @   04:23 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.5 WSW [228 total miles] VECTOR #1……………….9.9
VECTOR #2………………10.4
DAVIS #1………………..9.8 W
DAVIS #2……………….10.3 W
RMY #1………………….9.8 W
RMY #2…………………10.3 W
RICHARDS (C5C)…………..9.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH (MAY)……..1.95 DEPARTURE…..-1.20
TOTAL PRECIPITATION FOR THE YEAR (2026)…….15.62 DEPARTURE…..-6.31

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 The low since midnight is 62F, the daily normal low is 51F.

————————————————————–

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 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

TODAY’S REPORT PREPARED BY: Matt Douglas

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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