Thursday, May 8, 2025

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

THURSDAY, MAY 8, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0430E
SUNSET:  1852E

A MIX OF SUN AND CLOUDS; WARM WITH A LIGHT VARIABLE WIND….

It’s a rather nice day out there today with sunshine mixing with
various cloud types. All 3 levels (low, middle, and high) are
being represented today with cumulus, altocumulus, and cirrus
creating a very nice contrast against a deep blue sky above them.

Temperatures have once again reached the low to mid 70s early this
afternoon. This combined with dew points in the mid 50s and a
light wind, it’s making for a very comfortable afternoon to be out-
doors. However the flow, albeit light, has become onshore just
before the 1pm observation, so the temperature may slip back
some from this point.

As mentioned, winds are quite light, and were variable up until
just after 12:30pm, when it shifted to east and east-northeast. The
average speed so far today is only around 7mph. The peak gust for
the day so far occurred back just after midnight with a value of
16mph.

Visibility has been quite decent today at around 70 miles all day
despite an increase in pollen, seen as haziness.

The maximum temperature for today is 74F degrees, which is 9 degrees
above the normal high of 65F. The minimum temperature since midnight
is 54F degrees, which is 8 degrees above the normal low of 46F.

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Today’s Observations:

7 A.M.
Weather: Overcast cirrus, few breaks in overcast all quadrants,
few stratocumulus distant WNW-NNW, few cirrostratus distant ESE-S-SW
Temperature: 60F; Dew Point: 55F; Relative Humidity: 82%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 60F
6-hr Min temp: 54F
24-hr Precip:  0.01 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 OVC 70 170/60/55/3206/003/ FEW BINOVC ALQDS
FEW SC DSNT WNW-NNW FEW CS DSNT ESE-S-SW WND LGT/ 8/505 51010
70001 10060 20054

10 A.M.
Weather: Broken cumulus, broken altocumulus/castellanus, broken cirrus
Temperature: 68F; Dew Point: 55F; Relative Humidity: 63%
Wind: SW @ 3 kts, wind light and variable
Sea-level pressure: 1017.9 mb; 30.06 in. Hg: rising, then more slowly
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E30 BKN 100 BKN 250 BKN 70 179/68/55/2303/006/
WND L/V/ 8/284 51009

1 P.M.
Weather: Broken cumulus, broken stratocumulus, broken altocumulus,
broken cirrus, few lower cumulus fractus all quadrants
Temperature: 71F Dew Point: 57F; Relative Humidity: 61%
Wind: E @ 3 kts, wind shift at 12:38 P.M., wind light
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 74F
6-hr Min temp: 60F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E40 BKN 55 BKN 100 BKN 250 BKN 70 167/71/57/0803/002/
FEW LWR CUFRA ALQDS WSHFT 38 WND LGT/ 8/461 58012 10074 20060

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SUMMARY FOR WEDNESDAY, MAY 7, 2025

TEMPERATURE (DEGREES F)
MAX…….72   NORMAL…..65
MIN…….54   NORMAL…..46
MEAN……63   NORMAL…..55

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+8
TOTAL DEPARTURE FOR THE MONTH………………………+38 [+5.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..2  DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH…………….41  DEPARTURE…….-37
TOTAL HEATING UNITS FOR THE SEASON………….5439  DEPARTURE……-526
TOTAL HEATING UNITS LAST SEASON TO DATE……..5233  DEPARTURE……+206

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………..4  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………….7  DEPARTURE……..+1
TOTAL COOLING UNITS LAST SEASON TO DATE………..2  DEPARTURE……..+5

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)………..33 SSW  @   12:40 P.M.
VECTOR #1 (1-Sec)……….33 SW   @   03:04 P.M.
VECTOR #2 (1-Sec)……….35 SSW  @   12:39 P.M.
DAVIS #1……………….35 S    @   12:42 P.M.
DAVIS #2 ………………35 S    @   12:42 P.M.
RMY #1 (Instantaneous)…..35 SSW  @   12:39 P.M.
RMY #2 (Instantaneous)…..37 SSW  @   12:39 P.M.
MERLIN…………………33 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 SSW  @   02:40 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23      @   12:41 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24      @   12:41 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S    @   12:41 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 SSW  @   02:48 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 SSW  @   12:41 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 SW   @   02:48 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.7 SSW [280 total miles] VECTOR #1………………11.9
VECTOR #2………………12.3
DAVIS #1……………….11.5 SSW
DAVIS #2……………….12.5 SSW
RMY #1…………………11.6 SSW
RMY #2…………………12.4 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..1.24 DEPARTURE…..+0.36
TOTAL PRECIPITATION FOR THE YEAR (2025)…….15.36 DEPARTURE…..-4.30

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.9

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PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1   69/43/56/+3/0.00/0.0/744/88        28 S   VEC1 28 SSW RMY 28
5/2   79/47/63/+9/0.19/0.0/339/40        28 SE  VEC1 29 SE  RMY 25 TSTM
5/3   84/54/69/+15/0.15/0.0/561/66       43 SSW VEC1 42 SSW RMY 44 TSTM
5/4   77/50/64/+10/0.06/0.0/256/30       33 SW  VEC1 34 SW  RMY 32
5/5   50/46/48/-7/0.26/0.0/000/00        35 ENE VEC1 35 ENE RMY 36
5/6   61/48/55/0/0.57/0.0/000/00         26 S   VEC1 27 ENE RMY 27
5/7   72/54/63/+8/0.01/0.0/310/36        33 SSW VEC1 33 SW  RMY 35

5/8 The low since midnight is 54F, the daily normal low is 46F.

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MAY 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 MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943

RECORDS FOR MAY 9
HIGH 93F IN 2000
LOW 31F IN 1947
PRECIP 2.72 INCHES IN 1954
SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)
PEAK GUST 70e MPH NE IN 1977

TODAY’S REPORT PREPARED BY: MFD