Saturday, April 19, 2025

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

SATURDAY, APRIL 19, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0456E
SUNSET:  1831E

VERY WARM DESPITE FILTERED SUNSHINE….

Today is quite the opposite of last Saturday, with very warm
temperatures and a summer-like feel. Skies have remained mostly
cloudy for much of the day, but as these are primarily thin
mid and upper-level clouds, some sunshine has been able to make it
through. Conditions are perfect for those climbing the hill today
for our ‘Climb for Climate’ event to celebrate the upcoming Earth Day!

Despite the cloudiness, temperatures are well above normal, primarily
due to warm air advection on steady southwest flow. This morning the
low temperature was in the low 50s, quickly rising to the low 80s
by the early afternoon. The dew point has climbed a touch as well,
rising from the upper 40s to the mid 50s.

Winds are steady, currently out of the west-southwest, with an average
speed of 16mph. The peak gust to this point is around 30mph, occurring
just after noon.

Visibility remains modest due to haziness, holding at 20 miles.

The maximum temperature for today is 80F degrees, which is 22
degrees above the normal high of 58F. The minimum temperature
since midnight is 52F degrees, which is 13 degrees above the
normal low of 39F.

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Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus,
overcast cirrus, few breaks in overcast NE-SE, sun dimly visible
Temperature: 57F; Dew Point: 49F; Relative Humidity: 75%
Wind: SSW @ 14G20 kts
Sea-level pressure: 1014.1 mb; 29.95 in. Hg: rising, then falling
Visibility: 20 miles, hazy
6-hr Max temp: 57F
6-hr Min temp: 52F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 75 SCT E180 BKN 250 OVC 20 141/57/49/2114G20/995/
FEW BINOVC DSNT NE-SE SUN DMLY VSBL HAZY/ 8/056 50005 10057 20052

10 A.M.
Weather: Scattered altocumulus, broken altostratus, broken cirrus
Temperature: 70F; Dew Point: 54F; Relative Humidity: 57%
Wind: SSW @ 10 kts
Sea-level pressure: 1031.1 mb; 29.92 in. Hg: rising, then falling
Visibility: 20 miles, hazy
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 85 SCT E150 BKN 250 BKN 20 131/70/54/2110/992/ HAZY/
8/071 58010

1 P.M.
Weather: Broken cirrostratus, overcast cirrus,
few breaks in overcast all quadrants, few altocumulus all quadrants
Temperature: 79F Dew Point: 54F; Relative Humidity: 42%
Wind: WSW @ 14G23 kts
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: falling, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 57F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E200 BKN 250 OVC 20 114/79/54/2514G23/987/ FEW BINOVC ALQDS
FEW AC ALQDS HAZY/ 8/057 58017 10080 20057

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SUMMARY FOR FRIDAY, APRIL 18, 2025

TEMPERATURE (DEGREES F)
MAX…….66   NORMAL…..58
MIN…….38   NORMAL…..39
MEAN……52   NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+4
TOTAL DEPARTURE FOR THE MONTH……………………..-25 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….13  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH……………392  DEPARTURE…….+23
TOTAL HEATING UNITS FOR THE SEASON………….5321  DEPARTURE……-394
TOTAL HEATING UNITS LAST SEASON TO DATE……..4969  DEPARTURE……+352

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)………..41 SSW  @   05:33 P.M.
VECTOR #1 (1-Sec)……….42 SSW  @   05:32 P.M.
VECTOR #2 (1-Sec)……….41 SSW  @   05:29 P.M.
DAVIS #1……………….40 S    @   05:04 P.M.
DAVIS #2 ………………46 S    @   05:29 P.M.
RMY #1 (Instantaneous)…..43 SSW  @   06:12 P.M.
RMY #2 (Instantaneous)…..44 SSW  @   06:12 P.M.
MERLIN…………………41 SSW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 SSW  @   06:10 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28      @   05:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30      @   05:34 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………29 S    @   05:05 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 SSW  @   05:34 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..28 SW   @   05:34 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 SSW  @   05:34 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.3 SSW [343 total miles] VECTOR #1………………14.3
VECTOR #2………………14.8
DAVIS #1……………….14.0 SW
DAVIS #2……………….14.6 SW
RMY #1…………………14.0 SW
RMY #2…………………14.8 SW
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…..-0.41
TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.33 DEPARTURE…..-3.72

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……-0.8
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 The low since midnight is 52F, 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 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

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

TODAY’S REPORT PREPARED BY: Joshua Polen