Friday, April 24, 2026

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

FRIDAY, APRIL 24, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0449E
SUNSET: 1836E

INCREASING AFTERNOON CLOUDS AND SLIGHTLY COOLER TODAY….

Skies have been clear throughout the day with the exception of a
few cumulus layers lingering about. At sunrise there was minimal
ground fog observed. By the first observation and until the early
afternoon conditions have remained clear, dry, and a bit cooler
than the previous couple of days.

Temperatures have remained below normal today, with a morning low
of 35F this morning. Dry, sunny conditions did help temperatures
recover, but we are still around 10 degrees cooler than we were
this time yesterday. Dew points were in the lower 30’s this morning
and have continued to drop as the cold, arctic air has settled in
the area.

Winds have lightened considerably since yesterday afternoon, with
a light to steady breeze out of the north-northwest for the first
half of the day. By the early afternoon winds have started to shift
to the northeast. The average speed for the day so far is around
8mph. The peak gust so far today is 24mph, which occurred at 07:44am.

Although it feels markedly cooler today, visibility has been just
spectacular with 70-80 miles today. That is one positive to cooler
air this time of year.

The maximum temperature so far today is 54F degrees, which is 6
degrees below the normal high of 60F. The minimum temperature since
midnight is 35F degrees, which is 6 degrees below the normal low
of 41F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus distant NE-ESE-WSW
Temperature: 43F; Dew Point: 33F; Relative Humidity: 67%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1011.5 mb; 29.87 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 43F
6-hr Min temp: 35F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 80 115/43/33/3206/987/ FEW AC/ACC DSNT NE-ESE-WSW
WND LGT/ 8/080 51006 10043 20035

10 A.M.
Weather: Clear, few altocumulus all quadrants
Temperature: 50F; Dew Point: 27F; Relative Humidity: 40%
Wind: NW @ 7 kts
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: rising, then falling
Visibility: 80 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 80 114/50/40/3207/987/ FEW SC ALQDS/ 8/050 58001

1 P.M.
Weather: Scattered altocumulus
Temperature: 54F; Dew Point: 26F; Relative Humidity: 33%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1010.4 mb; 29.84 in. Hg: falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 54F
6-hr Min temp: 43F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 50 SCT 80 104/54/26/3406/984/ WND LGT/ 8/050 56010
10054 20043

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SUMMARY FOR THURSDAY, APRIL 23, 2026

TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..60
MIN…….40 NORMAL…..41
MEAN……53 NORMAL…..50

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+3
TOTAL DEPARTURE FOR THE MONTH………………………+49 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….12 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH (MAR)………401 DEPARTURE…….-46
TOTAL HEATING UNITS FOR THE SEASON………….5719 DEPARTURE…….-74
TOTAL HEATING UNITS LAST SEASON TO DATE……..5357 DEPARTURE……+362

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)………..43 NW @ 12:22 P.M.
VECTOR #1 (1-Sec)……….43 NW @ 12:22 P.M.
VECTOR #2 (1-Sec)……….42 NNW @ 02:33 P.M.
DAVIS #1……………….40 NW @ 12:23 P.M.
DAVIS #2 ………………36 WNW @ 03:59 P.M.
RMY #1 (Instantaneous)…..49 NW @ 04:19 P.M.
RMY #2 (Instantaneous)…..46 NW @ 12:38 P.M.
MERLIN…………………44 NW
RICHARDS (C5C) (Inst)……43 NW @ 04:19 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 NW @ 04:39 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27 NW @ 04:39 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..29 WNW @ 04:00 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 NW @ 04:39 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WNW @ 04:01 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 NW @ 04:38 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..28 WNW @ 04:00 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………27 NW @ 04:39 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.3 NW [272 total miles] VECTOR #1………………11.5
VECTOR #2………………12.0
DAVIS #1……………….11.8 NW
DAVIS #2………………..M
RMY #1…………………11.5 WNW
RMY #2…………………11.8 WNW
RICHARDS (C5C)………….11.9

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…..-1.97
TOTAL PRECIPITATION FOR THE YEAR (2026)…….13.46 DEPARTURE…..-4.32

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