Friday, April 18, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, APRIL 18, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0458E
SUNSET: 1830E
BOUNTIFUL SUNSHINE, BREEZY CONDITIONS TO START OFF THE WEEKEND….
Today has been absolutely stunning, featuring mostly clear skies
with the exception of just a few cirrus clouds lingering about.
Conditions have remained dry over the past couple of days, and
the dry air has given us clear views as well. The wind has started
to increase in the past few hours, but overall it still feels like
a warm, spring day.
Temperatures overnight dropped to 38F and rebounded quite quickly
with the all day sunshine we had today. We are well above normal,
with our high so far today 8F higher than average at 66F. Because
the wind has been out of the SW for much of the day, we have much
milder air coming through, which hasn’t impacted our temperatures
much at all.
Winds were on the lighter side this morning out of the WNW until
around 8am when we saw a shift to the SW and an increase in
overall speed. We were averaging around 8mph this morning but since
the direction shift we have averaged around 12mph with gusts in the
18-20mph range. Our daily average so far is 9mph. The peak gust for
the day so far is 31mph, which occurred just after our final daily
observation, at 1:05pm.
Thanks to the continued dry air mass in our region, we have enjoyed
70-80 miles of visibility throughout the day. As the temperature
started to warm during the early afternoon when the visibility
began to see a slight decrease.
The maximum temperature for today is 66F degrees, which is 8
degrees above the normal high of 58F. The minimum temperature
since midnight is 38F degrees, which is 1 degree below the
normal low of 39F.
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Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant east and SSW-W-NNW
Temperature: 46F; Dew Point: 24F; Relative Humidity: 42%
Wind: WNW @ 4 kts, wind light
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: rising, then
more slowly
Visibility: 80 miles
6-hr Max temp: 46F
6-hr Min temp: 38F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 80 255/46/24/3004/028/ FEW CI DSNT E AND SSW-W-NNW
WND LGT/ 8/001 51018 10046 20038
10 A.M.
Weather: Clear, few cirrus SW-W-NNW
Temperature: 58F; Dew Point: 23F; Relative Humidity: 26%
Wind: SSW @ 8 kts
Sea-level pressure: 1024.2 mb; 30.24 in. Hg: falling, then
more rapidly
Visibility: 80 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 CLR 80 242/58/23/1908/024/ FEW CI SW-W-NNW/ 8/001 58013
1 P.M.
Weather: Clear, few altocumulus all quadrants, few cirrus all quadrants
Temperature: 65F Dew Point: 28F; Relative Humidity: 24%
Wind: SSW @ 12G20 kts
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: falling, then
more slowly
Visibility: 70 miles
6-hr Max temp: 65F
6-hr Min temp: 46F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 CLR 70 220/65/28/2112G20/018/ FEW AC ALQDS FEW CI ALQDS/
8/051 56022 10066 20046
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SUMMARY FOR THURSDAY, APRIL 17, 2025
TEMPERATURE (DEGREES F)
MAX…….59 NORMAL…..57
MIN…….35 NORMAL…..39
MEAN……47 NORMAL…..48
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-1
TOTAL DEPARTURE FOR THE MONTH……………………..-29 [-1.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….18 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………379 DEPARTURE…….+27
TOTAL HEATING UNITS FOR THE SEASON………….5308 DEPARTURE……-391
TOTAL HEATING UNITS LAST SEASON TO DATE……..4948 DEPARTURE……+360
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
F420C (Official)………..35 WNW @ 02:18 P.M.
VECTOR #1 (1-Sec)……….34 WNW @ 02:18 P.M.
VECTOR #2 (1-Sec)……….36 W @ 02:18 P.M.
DAVIS #1……………….35 W @ 02:18 P.M.
DAVIS #2 ………………35 WNW @ 02:18 P.M.
RMY #1 (Instantaneous)…..34 WNW @ 03:47 P.M.
RMY #2 (Instantaneous)…..37 W @ 02:18 P.M.
MERLIN…………………33 NW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 WNW @ 02:37 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 @ 02:36 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26 @ 10:34 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 W @ 02:38 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 WNW @ 10:35 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 WNW @ 02:37 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 WNW @ 10:34 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.3 WNW [343 total miles]
VECTOR #1………………13.9
VECTOR #2………………15.0
DAVIS #1……………….14.6 WNW
DAVIS #2……………….14.8 WNW
RMY #1…………………13.1 WNW
RMY #2…………………14.7 W
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..2.62 DEPARTURE…..-0.26
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.33 DEPARTURE…..-3.57
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-0.7
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.5
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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 55/32/44/+3/0.17/0.0/512/67 38 NW VEC1 38 NW RMY 40
4/2 42/27/35/-6/0.11/T/584/76 29 NNW VEC1 28 NNW RMY 29
4/3 62/32/47/+5/0.31/0.0/000/00 38 SW VEC1 38 SW RMY 39
4/4 69/47/58/+16/0.00/0.0/456/59 31 NW VEC1 31 NW RMY 30
4/5 47/36/42/-1/0.49/0.0/000/00 25 ESE VEC1 29 SE RMY 25
4/6 51/37/44/+1/0.20/0.0/016/02 22 NNW VEC1 21 NNW RMY 21
4/7 45/34/40/-4/0.18/T/000/00 24 E VEC1 23 NNE RMY 23
4/8 40/26/33/-11/0.10/0.1/196/25 51 W VEC1 48 W RMY 51
4/9 46/24/35/-9/0.00/0.0/755/96 36 WNW VEC1 33 NW RMY 36
4/10 49/29/39/-6/0.01/0.0/569/72 23 SSW VEC1 23 SSW RMY 25
4/11 45/31/38/-7/0.39/1.2/024/03 25 ENE VEC1 27 ENE RMY 26
4/12 36/33/35/-11/0.46/0.4/000/00 39 ENE VEC1 40 E RMY 42
4/13 42/35/39/-7/0.16/0.0/000/00 38 NE VEC1 38 NE RMY 40
4/14 67/35/51/+4/0.00/0.0/745/93 29 WNW VEC1 29 NNW RMY 28
4/15 66/44/55/+8/0.04/0.0/209/26 53 NW VEC1 51 NW RMY 54 TSTM
4/16 51/37/44/-3/T/0.0/484/60 44 WNW VEC1 43 WNW RMY 47
4/17 59/35/47/-1/0.00/0.0/…/.. 35 WNW VEC1 34 WNW RMY 34
4/18 The low since midnight is 38F, the daily normal low is 39F.
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APRIL DAILY RECORDS TO DATE
NONE.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 4.3 IN. IN 2020
PEAK GUST 59 MPH S IN 1982
RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH]
LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 1.3 IN. IN 1967
PEAK GUST 66 MPH E IN 1984
TODAY’S REPORT PREPARED BY: Amanda Joly
