Sunday, April 20, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, APRIL 20, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0455E
SUNSET: 1832E
AFTER A TASTE OF SUMMER YESTERDAY, BACK TO MORE SEASONABLE WEATHER
ON THIS EASTER SUNDAY….
Quite the taste of summer yesterday with temperatures reaching the
low 80s under a milky sky and hazy conditions. Even the dew point
reached the mid 50s yesterday to add a slight humid feel to the air.
Even overnight, temperatures were slow to decrease with a reading
of 67F still at midnight (which is the high for today). A cold
front pushed through early this morning with a pretty sharp increase
in wind and a modest drop in temperature into the low to mid 50s.
The strong cold air advection is continuing into early this
afternoon with strong gusty winds, and temperatures that are having
a hard time gaining much upward momentum as readings have only
recovered to the low 60s. Dew point values have been on the decline
as the cold air advection continues, with readings dropping from the
mid 50s during the wee hours of this morning, to the upper 20s by
early this afternoon. The good news is that there is plenty of
sunshine today, so all in all it’s not a bad day for any Easter
plans despite the gusty wind.
As mentioned, winds are quite busy today. A mostly northwest flow
has been averaging at around 21mph for the day so far. Frequent
gusts over 30mph have been occurring here on the summit since early
this morning. The peak gust for the day so far is 53mph, which
occurred just after 8:30am this morning.
Visibility is excellent today with the drier, clearer air mass
pushing into the region. The view has been 70-80 miles all day!
The maximum temperature for today is 67F degrees, which is 8
degrees above the normal high of 59F. The minimum temperature
since midnight is 53F degrees, which is 13 degrees above the
normal low of 40F.
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Today’s Observations:
7 A.M.
Weather: Scattered cirrus, few stratocumulus distant W-NW-NE
Temperature: 54F; Dew Point: 38F; Relative Humidity: 53%
Wind: NW @ 21G38 kts, peak wind NW 44mph at 6:47 A.M.
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 53F
24-hr Precip: Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 250 SCT 70 180/54/38/3121G38/006/ FEW SC DSNT W-NW-NE
PK WND 3138/47/ 8/501 51047 70000 10066 20053
10 A.M.
Weather: Thin scattered cirrus, few stratocumulus distant WSW-NW-NNE
Temperature: 57F; Dew Point: 30F; Relative Humidity: 35%
Wind: NW @ 26G40 kts, peak wind NW 48mph at 9:23 A.M.
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 250 -SCT 80 200/57/30/3126G40/012/ FEW SC DSNT WSW-NW-NNE
PK WND 3142/23/ 8/501 51020
1 P.M.
Weather: Thin broken cirrus
Temperature: 61F Dew Point: 27F; Relative Humidity: 28%
Wind: NNW @ 20G33 kts, peak wind NNW 43mph at 12:43 P.M.
Sea-level pressure: 1021.5 mb; 30.16 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 54F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 250 -BKN 80 215/61/27/3320G33/016/ PK WND 3337/43/
8/501 51015 10062 20054
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SUMMARY FOR SATURDAY, APRIL 19, 2025
TEMPERATURE (DEGREES F)
MAX…….82 NORMAL…..58
MIN…….52 NORMAL…..39
MEAN……67 NORMAL…..49
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+18
TOTAL DEPARTURE FOR THE MONTH………………………-7 [-0.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE MONTH……………392 DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE SEASON………….5321 DEPARTURE……-411
TOTAL HEATING UNITS LAST SEASON TO DATE……..4983 DEPARTURE……+338
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..2 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………..2 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………….2 DEPARTURE……..+1
TOTAL COOLING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+2
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)………..40 WNW @ 10:41 P.M.
VECTOR #1 (1-Sec)……….40 W @ 10:23 P.M.
VECTOR #2 (1-Sec)……….37 W @ 09:59 P.M.
DAVIS #1……………….39 W @ 10:23 P.M.
DAVIS #2 ………………37 W @ 09:59 P.M.
RMY #1 (Instantaneous)…..40 W @ 10:12 P.M.
RMY #2 (Instantaneous)…..42 W @ 09:59 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 WNW @ 11:45 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25 @ 10:24 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 10:46 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 W @ 10:24 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 W @ 10:00 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 W @ 10:24 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 W @ 11:28 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..15.9 SW [381 total miles]
VECTOR #1………………15.7
VECTOR #2………………16.0
DAVIS #1……………….15.6 SW
DAVIS #2……………….16.1 SW
RMY #1…………………15.3 SW
RMY #2…………………16.0 SW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..2.62 DEPARTURE…..-0.55
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.33 DEPARTURE…..-3.86
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-0.8
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.6
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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 66/38/54/+4/0.00/0.0/…/.. 41 SSW VEC1 42 SSW RMY 43
4/19 82/52/67/+18/T/0.0/…/.. 40 WNW VEC1 40 W RMY 40
4/20 The low since midnight is 53F, the daily normal low is 40F.
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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 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963
RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940
TODAY’S REPORT PREPARED BY: MFD
