Monday, April 27, 2026

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

MONDAY, APRIL 27, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0445E
SUNSET: 1839E

ABUNDANT SUNSHINE TODAY AND A TOUCH MILDER WITH AN ONSHORE BREEZE….

An area of low pressure a couple hundred miles southeast of Nantucket
combined with an area of high pressure building to the north over
Canada are combining to keep an onshore flow going across the area
once again today. With a plethora of high latitude blocking over
the North Atlantic, weather systems will be slow to move, thus keeping
these conditions going for a couple of days. On the bright side (no
pun intended), subsidence between the two systems are allowing for
clear skies and abundant sunshine today.

Temperatures are a touch milder today than yesterday and are at
seasonable levels. Readings have reached the low 60s by early this
afternoon. Dew points have hovered in the mid to upper 30s throughout
the day, helping to maintain that chilly feel to the air.

Winds are busier today than they were yesterday. A northeast to east-
northeast flow has been averaging at around 10mph for the day so far.
Gusts have been occasionally exceeding 20mph, with a peak so far of
23mph, which occurred just after 11am this morning.

It has been another great day of visibility, with views holding at
around 70 miles.

The maximum temperature so far today is 62F degrees, which is 1
degree above the normal high of 61F. The minimum temperature since
midnight is 44F degrees, which is 2 degrees above the normal low
of 42F.

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Today’s Observations:

7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 50F; Dew Point: 37F; Relative Humidity: 60%
Wind: ENE @ 7 kts
Sea-level pressure: 1025.3 mb; 30.28 in. Hg: rising unsteadily
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 44F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 253/50/37/0607/028/ FEW CI ALQDS/ 8/001 52018
10050 20044

10 A.M.
Weather: Clear, few cumulus distant N, few cirrus distant E-SSE
Temperature: 57F; Dew Point: 38F; Relative Humidity: 48%
Wind: ENE @ 8G19 kts
Sea-level pressure: 1026.4 mb; 30.31 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 80 264/57/38/0608G19/031/ FEW CU DSNT N
FEW CI DSNT E-SSE/ 8/201 51011

1 P.M.
Weather: Clear, few cumulus distant W-NNE, few altocumulus castellanus
distant ESE-SE, few cirrus distant E-SE
Temperature: 62F; Dew Point: 37F; Relative Humidity: 40%
Wind: ENE @ 8G16 kts
Sea-level pressure: 1025.9 mb; 30.29 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 62F
6-hr Min temp: 50F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 259/62/37/0708G16/029/ FEW CU DSNT W-NNE
FEW ACC DSNT ESE-SE FEW CI DSNT E-SE/ 8/281 58005 10062 20050
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SUMMARY FOR SUNDAY, APRIL 26, 2026

TEMPERATURE (DEGREES F)
MAX…….57 NORMAL…..61
MIN…….41 NORMAL…..42
MEAN……49 NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………+34 [+1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….16 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH (MAR)………457 DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON………….5775 DEPARTURE…….-60
TOTAL HEATING UNITS LAST SEASON TO DATE……..5373 DEPARTURE……+402

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)………..16 ENE @ 02:51 P.M.
VECTOR #1 (1-Sec)……….16 ENE @ 02:51 P.M.
VECTOR #2 (1-Sec)……….16 NE @ 03:38 P.M.
DAVIS #1……………….16 ENE @ 02:51 P.M.
DAVIS #2 ………………15 ENE @ 12:39 P.M.
RMY #1 (Instantaneous)…..16 ENE @ 04:04 P.M.
RMY #2 (Instantaneous)…..16 NE @ 03:38 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……14 E @ 04:03 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………10 E @ 03:17 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11 ENE @ 02:53 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 ENE @ 03:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 E @ 03:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………12 E @ 03:14 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 E @ 03:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 ENE @ 03:14 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………12 E @ 03:14 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………3.2 ENE [077 total miles] VECTOR #1……………….5.1
VECTOR #2……………….5.3
DAVIS #1………………..5.0 E
DAVIS #2………………..5.0 ESE
RMY #1………………….5.2 ESE
RMY #2………………….5.2 E
RICHARDS (C5C)…………..5.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH (APR)……..1.79 DEPARTURE…..-2.40
TOTAL PRECIPITATION FOR THE YEAR (2026)…….13.46 DEPARTURE…..-4.75

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH (APR)…………TRACE DEPARTURE…..-2.7
TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+12.0

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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

4/1 73/38/56/+15/0.16/0.0/061/08 35 NE VEC1 34 ENE RMY 35
4/2 38/34/36/-5/0.45/0.0/000/00 31 E VEC1 31 E RMY 33
4/3 67/35/51/+9/0.04/0.0/270/35 31 SW VEC1 31 SW RMY 35
4/4 58/35/47/+5/0.01/0.0/093/12 39 ENE VEC1 38 ENE RMY 42
4/5 55/36/46/+3/0.16/0.0/008/01 35 NW VEC1 36 NW RMY 38
4/6 50/32/41/-2/0.00/0.0/708/91 46 WNW VEC1 46 WNW RMY 47
4/7 50/29/40/-4/0.10/T/336/43 39 WNW VEC1 39 WNW RMY 41
4/8 43/25/34/-10/0.00/0.0/753/96 30 NNW VEC1 31 NNW RMY 32
4/9 56/30/43/-1/0.00/0.0/755/96 35 S VEC1 35 SSW RMY 35
4/10 67/33/50/+5/0.00/0.0/672/85 37 S VEC1 36 SSW RMY 37
4/11 60/41/51/+6/0.00/0.0/690/87 37 NW VEC1 37 NW RMY 37
4/12 54/35/45/-1/0.02/0.0/549/69 28 S VEC1 28 S RMY 28
4/13 69/41/55/+9/T/0.0/168/21 40 SSW VEC1 41 SSW RMY 42
4/14 83/58/71/+24/0.15/0.0/617/77 46 SSW VEC1 46 SSW RMY 47
4/15 77/44/61/+14/T/0.0/626/78 25 NE VEC1 25 NE RMY 24
4/16 69/45/57/+10/0.37/0.0/347/43 45 NW VEC1 44 NW RMY 50 TSTM
4/17 62/47/55/+7/0.14/0.0/145/18 31 NE VEC1 32 NNW RMY 31
4/18 48/41/45/-3/0.04/0.0/008/01 28 ENE VEC1 26 E RMY 27
4/19 49/34/42/-7/0.14/T/000/00 40 NW VEC1 39 NW RMY 42 TSTM
4/20 50/31/41/-8/T/T/596/73 31 W VEC1 30 W RMY 32
4/21 50/31/41/-9/0.00/0.0/812/99 28 S VEC1 29 S RMY 28
4/22 44/34/39/-11/T/0.0/000/00 31 SSW VEC1 31 SSW RMY 32
4/23 65/40/53/+3/0.00/0.0/…/.. 43 NW VEC1 43 NW RMY 49
4/24 56/35/46/-5/0.00/0.0/…/.. 23 NNW VEC1 24 NNW RMY 23
4/25 51/36/44/-7/0.00/0.0/…/.. 18 NE VEC1 18 NE RMY 19
4/26 57/41/49/-3/0.00/0.0/…/.. 16 ENE VEC1 16 ENE RMY 16