Sunday, April 19, 2026

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

SUNDAY, APRIL 19, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0457E
SUNSET: 1830E

FOGGY MORNING WITH LIGHT DRIZZLE FOLLOWED BY AFTERNOON
THUNDERSTORMS AND DAMP, RAW CONDITIONS….

For most of the morning we were in the clouds, with limited
visibility and a lingering drizzle. This made the overall feel of
the air a bit raw but tolerable. Then, around 12:30pm standard time,
the wind shifted to the northwest and the air felt much more raw, cold,
and damp. The wind also picked up, averaging from around 7mph to 17mph
during the 12pm hour! With this, came several rounds of rolling thunder
and rain that has went from light to heavy and back to light. Despite
all of this excitement, only 0.07″ of rain has been measured during the
observation period today.

Temperatures remained in the lower to mid 40’s for much of the day
today. The temperature did make it to 40F before the winds shifted
to the northwest as thunderstorms and heavier rain came through, which
dropped temperatures back to the 7am temp of 45F. Dew points remained
the same as the air temperature with the nearly continuous drizzle and
rain storms.

Winds were calm during the midnight hour and have remained light
throughout the first half of the day. Winds have been variable, but
have mostly been out of the south shifting more westerly by the
early afternoon. Once thunderstorms coved into the area, the wind
picked up in intensity and shifted to the northwest. The average speed
for the day so far is only around 7mph. The peak gust for the day so
far is 39mph, which occurred at 12:51pm this afternoon.

Visibility was poor this morning, with 1/16th of a mile and improved
to around 1/8th of a mile by mid morning. Visibility did improve even
with the rain and thunderstorms, but only to about 15 miles, with some
sectors around 30 miles by the early afternoon.

The maximum temperature so far today is 49F degrees, which is
9 degrees below the normal high of 58F. The minimum temperature
since midnight is 42F degrees, which is 3 degrees above the
normal low of 39F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 45F; Dew Point: 45F; Relative Humidity: 100%
Wind: ESE @ 6 kts, wind light
Sea-level pressure: 1009.3 mb; 29.81 in. Hg: falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 48F
6-hr Min temp: 46F
24-hr Precip: 0.03 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W1 1/16F 093/45/45/1606/981/ WND LGT/ 8//// 58019 6000/
70003 10045 20042

10 A.M.
Weather: Sky obscured, vertical visibility 200ft, very light drizzle
Temperature: 47F; Dew Point: 47F; Relative Humidity: 100%
Wind: WSW @ 7 kts
Sea-level pressure: 1008.7 mb; 29.79 in. Hg: falling, then more slowly
Visibility: 1/8 mile, fog
3-hr Precip: 0.02 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 1/8L-F 087/47/47/2507/979/ PCPN VRY LGT/ 8////
56006 6002/

1 P.M.
Weather: Thunder, light rain showers, occasional lightning, overcast
nimbostratus, lower stratocumulus distant SSE-SW-WNW
Temperature: 45F; Dew Point: 45F; Relative Humidity: 100%
Wind: NW @ 26G34 kts, peak wind NW 39mph at 12:51 P.M.
Sea-level pressure: 1007.4 mb; 29.75 in. Hg: falling, then more slowly
Visibility: 15 miles, 30 miles SSE-WSW-NW, thin fog
6-hr Max temp: 49F
6-hr Min temp: 45F
6-hr Precip: 0.07 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E26 BKN 40 OVC 15TRW- 074/45/45/3226G34/975/ LWR SC DSNT
SSE-SW-WNW THN F ALQDS RW-B16 TB47 OCNL LTGIC VSBY 30 SSE-WSW-NW PK
WND 3234/51/ 8/52/ 56013 6007/ 10049 20045

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SUMMARY FOR SATURDAY, APRIL 18, 2026

TEMPERATURE (DEGREES F)
MAX…….48 NORMAL…..58
MIN…….41 NORMAL…..39
MEAN……45 NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3
TOTAL DEPARTURE FOR THE MONTH………………………+81 [+4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY…………….20 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH (MAR)………292 DEPARTURE…….-77
TOTAL HEATING UNITS FOR THE SEASON………….5610 DEPARTURE……-105
TOTAL HEATING UNITS LAST SEASON TO DATE……..5321 DEPARTURE……+289

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 ENE @ 06:51 A.M.
VECTOR #1 (1-Sec)……….26 E @ 07:55 A.M.
VECTOR #2 (1-Sec)……….28 ENE @ 07:52 A.M.
DAVIS #1……………….27 E @ 07:55 A.M.
DAVIS #2 ……………….M
RMY #1 (Instantaneous)…..27 ENE @ 06:51 A.M.
RMY #2 (Instantaneous)…..29 NE @ 09:00 A.M.
MERLIN…………………23 ENE
RICHARDS (C5C) (Inst)……25 E @ 07:55 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 E @ 07:56 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16 ENE @ 09:08 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 ENE @ 09:07 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 E @ 07:56 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………….M
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 E @ 07:56 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 ENE @ 09:07 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 E @ 07:56 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.2 ENE [220 total miles] VECTOR #1……………….8.9
VECTOR #2……………….9.9
DAVIS #1………………..9.8 ENE
DAVIS #2………………….M
RMY #1………………….9.3 ENE
RMY #2………………….9.7 NE
RICHARDS (C5C)…………..9.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.03 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH (APR)……..1.65 DEPARTURE…..-1.38
TOTAL PRECIPITATION FOR THE YEAR (2026)…….13.32 DEPARTURE…..-3.73

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…..-2.5
TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+12.2

————————————————————–

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/…/.. 45 NW VEC1 44 NW RMY 50
4/17 62/47/55/+7/0.14/0.0/…/.. 31 NE VEC1 32 NNW RMY 31
4/18 48/41/45/-3/…/0.0/…/.. 28 ENE VEC1 26 E RMY 27