Tuesday, April 28, 2026

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

TUESDAY, APRIL 28, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0443E
SUNSET: 1841E

ABUNDANT SUNSHINE AGAIN TODAY, BUT COOLER WITH ONSHORE FLOW….

An area of low pressure continues to crawl a couple hundred miles
east-southeast of Nantucket with high pressure slowly retreating
northeastward toward Newfoundland. Meanwhile a frontal system is
trying to approach from the west. We are enjoying the area of
clear weather sandwiched in between these features. With the low
offshore, it’s keeping our flow out of an easterly direction off
the chilly ocean, so despite the abundance of sunshine,
temperatures are running cooler today than yesterday.

Temperature readings have been struggling into the mid 50s early
this afternoon. Normal highs are in the lower 60s now, so it’s
definitely below normal today. Dew points were holding in the
low 40s all morning, but have now dipped into the upper 30s
early this afternoon as some mixing from aloft starts to occur.

Winds have been fairly steady today, generally out of a northeast
to east-northeast direction. The average speed for the day so far
is around 8mph. The peak gust so far is 22mph, which occurred just
after 10am this morning.

Visibility has been decent for the most part except over in the
eastern quadrants where coastal clouds have been lingering along
with thin fog. The view has been around 50 miles all day, except
only 15-25 miles over the coastal waters.

The maximum temperature so far today is 56F degrees, which is 6
degrees below the normal high of 62F. The minimum temperature
since midnight is 41F degrees, which is 2 degrees below the
normal low of 43F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant N-SSE, few cirrus
distant SSW-W
Temperature: 48F; Dew Point: 42F; Relative Humidity: 79%
Wind: ENE @ 7G16 kts
Sea-level pressure: 1023.7 mb; 30.23 in. Hg: rising, then falling
Visibility: 50 miles, 15 miles N-E, thin fog N-SE
6-hr Max temp: 48F
6-hr Min temp: 41F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 50 237/48/42/0707G16/023/ FEW SC DSNT N-SSE
FEW CI DSNT SSW-W THN F N-SE K LYR UNDER INVRSN SW-NNW
VSBY 15 N-E/ 8/501 50002 10048 20041

10 A.M.
Weather: Thin scattered cirrus, few stratocumulus distant NE-SE
Temperature: 54F; Dew Point: 41F; Relative Humidity: 61%
Wind: ENE @ 6 kts, wind light
Sea-level pressure: 1024.1 mb; 30.24 in. Hg: rising, then steady
Visibility: 50 miles, 25 miles NNE-E
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 300 -SCT 50 241/54/41/0606/024/ FEW SC DSNT NE-SE
VSBY 25 NNE-E WND LGT/ 8/501 51004

1 P.M.
Weather: Scattered cirrus, thin broken cirrus, few stratocumulus
distant NE-SE
Temperature: 54F; Dew Point: 36F; Relative Humidity: 50%
Wind: ENE @ 9G17 kts
Sea-level pressure: 1023.3 mb; 30.22 in. Hg: falling, then steady
Visibility: 50 miles, 25 miles NE-E
6-hr Max temp: 56F
6-hr Min temp: 48F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 250 SCT 300 -BKN 50 233/54/36/0609G17/022/
FEW SC DSNT NE-SE VSBY 25 NE-E/ 8/504 56008 10056 20048

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SUMMARY FOR MONDAY, APRIL 27, 2026

TEMPERATURE (DEGREES F)
MAX…….63 NORMAL…..61
MIN…….44 NORMAL…..42
MEAN……54 NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH………………………+36 [+1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….11 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH (MAR)………468 DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON………….5786 DEPARTURE…….-63
TOTAL HEATING UNITS LAST SEASON TO DATE……..5389 DEPARTURE……+397

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)………..23 ENE @ 09:53 A.M.
VECTOR #1 (1-Sec)……….23 ENE @ 11:05 A.M.
VECTOR #2 (1-Sec)……….24 ENE @ 09:53 A.M.
DAVIS #1……………….22 ENE @ 11:05 A.M.
DAVIS #2 ………………22 NE @ 09:52 A.M.
RMY #1 (Instantaneous)…..23 ENE @ 11:19 A.M.
RMY #2 (Instantaneous)…..24 NE @ 11:05 A.M.
MERLIN…………………21 ENE
RICHARDS (C5C) (Inst)……21 ENE @ 11:05 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 ENE @ 11:34 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 NE @ 11:10 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 ENE @ 09:54 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 ENE @ 11:10 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 ENE @ 09:54 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 NE @ 11:10 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 ENE @ 09:54 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 ENE @ 09:53 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.9 ENE [190 total miles] VECTOR #1……………….8.5
VECTOR #2……………….9.2
DAVIS #1………………..9.1 ENE
DAVIS #2………………..9.2 E
RMY #1………………….8.6 ENE
RMY #2………………….9.1 ENE
RICHARDS (C5C)…………..9.1

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…..-2.55
TOTAL PRECIPITATION FOR THE YEAR (2026)…….13.46 DEPARTURE…..-4.90

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…..-0.1
TOTAL SNOWFALL FOR THE MONTH (APR)…………TRACE DEPARTURE…..-2.8
TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+11.9

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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
4/27 63/44/54/+2/0.00/0.0/…/.. 23 ENE VEC1 23 ENE RMY 23