Sunday, May 4, 2025

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

SUNDAY, MAY 4, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0435E
SUNSET:  1849E

LOTS OF CLOUDS TODAY, BUT CONTINUING ON THE WARM AND HUMID SIDE….

A rather humid air mass has been over the region for the past
couple of days as noted by the dew point rising above 60F. Periods
of showers and thunderstorms have been observed there over the past
couple of days as well, with one such period occurring last evening,
another brief one between 2-3am this morning, and a very light one
just before the 1pm observation today. Only 0.16″ of rain was measured
from these showers, so the yearly departure continues to show a
fairly significant deficit of 4.68″.

Clouds have been dominate today with only some filtered sunshine for
a time during the mid to late morning hours, however with the
developing rain showers, clouds are once again blocking the sun in
time for the 1pm observation.

Temperatures reached the upper 70s today before the sun was
completely overtaken by the cloud cover. While it is a bit cooler
than the mid 80s of yesterday, it is still solidly above seasonal
normals by more than 10F degrees. As mentioned, the dew point has
been in the low to mid 60s today, thus it is feeling rather humid
out there for sure.

Winds have been steady out of the south-southwest to southwest so far
today. The average speed so far is around 14mph, with a peak gust to
30mph occuring before 10am this morning.

Visibility remains poor, mostly due to the high moisture content of
the air. The view has been no more than 30 miles today, first with
thin fog early this morning, and then general haziness and scattered
rain showers early this afternoon.

The maximum temperature for today is 77F degrees, which is 13 degrees
above the normal high of 64F. The minimum temperature since midnight
is 58F degrees, which is 13 degrees above the normal low of 45F.

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus castellanus,
thin overcast cirrus, lower stratus fractus all quadrants
Temperature: 61F; Dew Point: 59F; Relative Humidity: 93%
Wind: SSW @ 13G19 kts
Sea-level pressure: 1014.6 mb; 29.96 in. Hg: rising, then more slowly
Visibility: 20 miles, 10 miles WNW-N, thin fog
6-hr Max temp: 61F
6-hr Min temp: 58F
24-hr Precip:  0.16 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E20 BKN 65 BKN 250 -OVC 20 146/61/59/2113G19/996/
FEW LWR STFRA ALQDS THN F ALQDS SUN DMLY VSBL VSBY 10 WNW-N/
8/581 51008 6000/ 70016 10061 20058

10 A.M.
Weather: Broken cumulus, overcast cirrus
Temperature: 72F; Dew Point: 63F; Relative Humidity: 72%
Wind: SW @ 14G26 kts, peak wind SW 30mph at 9:45 A.M.
Sea-level pressure: 1016.9 mb; 30.03 in. Hg: rising, then more slowly
Visibility: 20 miles, hazy
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E24 BKN 250 OVC 20 169/72/63/2314G26/003/ SUN DMLY VSBL
HAZY PK WND 2326/45/ 8/202 51023

1 P.M.
Weather: Broken cumulus, broken stratocumulus, broken altocumulus,
moderate cumulus N-NE, few lower cumulus fractus all quadrants
Temperature: 74F Dew Point: 60F; Relative Humidity: 62%
Wind: SSW @ 9G17 kts
Sea-level pressure: 1015.4 mb; 29.98 in. Hg: rising, then falling
Visibility: 30 miles, 15 miles SW-N-ENE, hazy
6-hr Max temp: 77F
6-hr Min temp: 61F
6-hr Precip:  Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E38 BKN 48 BKN 80 BKN 30 154/74/60/2009G17/998/
MDT CU N-NE FEW LWR CUFRA ALQDS RW-B45E54 VIRGA SW-N-NE
VSBY 15 SW-N-ENE HAZY/ 8/870 58001 6000/ 10077 20061

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SUMMARY FOR SATURDAY, MAY 3, 2025

TEMPERATURE (DEGREES F)
MAX…….84   NORMAL…..63
MIN…….54   NORMAL…..44
MEAN……69   NORMAL…..54

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+15
TOTAL DEPARTURE FOR THE MONTH………………………+27 [+8.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE MONTH…………….11  DEPARTURE…….-24
TOTAL HEATING UNITS FOR THE SEASON………….5409  DEPARTURE……-513
TOTAL HEATING UNITS LAST SEASON TO DATE……..5182  DEPARTURE……+213

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH……………..4  DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE SEASON…………….7  DEPARTURE……..+3
TOTAL COOLING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+7

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)………..43 SSW  @   02:56 P.M.
VECTOR #1 (1-Sec)……….42 SSW  @   01:48 P.M.
VECTOR #2 (1-Sec)……….41 SSW  @   02:56 P.M.
DAVIS #1……………….48 S    @   02:25 P.M.
DAVIS #2 ………………45 S    @   01:48 P.M.
RMY #1 (Instantaneous)…..44 SSW  @   02:56 P.M.
RMY #2 (Instantaneous)…..44 SSW  @   02:56 P.M.
MERLIN…………………40 SW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………32 SSW  @   02:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..30      @   02:56 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..32      @   02:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………30 SSW  @   02:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S    @   01:50 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..30 SSW  @   02:56 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..32 SSW  @   02:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..12.0 SSW [287 total miles] VECTOR #1………………12.2
VECTOR #2………………12.5
DAVIS #1……………….11.8 SSW
DAVIS #2……………….12.7 SSW
RMY #1…………………12.0 SSW
RMY #2…………………12.7 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.16 DEPARTURE…..+0.04
TOTAL PRECIPITATION FOR THE MONTH…………..0.35 DEPARTURE…..-0.02
TOTAL PRECIPITATION FOR THE YEAR (2025)…….14.47 DEPARTURE…..-4.68

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/…/..        28 S   VEC1 28 SSW RMY 28
5/2   79/47/63/+9/0.19/0.0/…/..        28 SE  VEC1 29 SE  RMY 25 TSTM
5/3   84/54/69/+15/0.15/0.0/…/..       43 SSW VEC1 42 SSW RMY 44 TSTM

5/4 The low since midnight is 58F, the daily normal low is 45F.

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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 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.67 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966

RECORDS FOR MAY 5
HIGH 92F IN 1949
LOW 30F IN 1891
PRECIP 2.74 INCHES IN 1922
SNOWFALL 3.0 INCHES IN 1917
PEAK GUST 58 MPH S IN 1966 & 58e MPH SW IN 1976

TODAY’S REPORT PREPARED BY: MFD