Saturday, May 10, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, MAY 10, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0428E
SUNSET: 1854E
DRIZZLE AND FOG LINGER AS STORM DEPARTS….
The storm system that has been impacting us since yesterday afternoon
has dropped beneficial rainfall, with a storm total so far of 1.42″.
The steady rain came to an end before midnight, with a thunderstorm
mid-morning followed by drizzle and light rain thereafter.
Temperatures are slowly climbing, beginning the day in the mid 40s and
now reaching the low 50s. Like yesterday, this is below normal for the
time of year.
The wind began out of the east-northeast early this morning. Since then,
the direction has shifted, and is now out of the west-northwest as the storm
heads offshore. Speeds have been steady, with an average thus far of 11mph.
The peak gust is not too impressive, being 25mph just after 12:30pm.
Visibility remains poor due to low clouds and fog, holding in the 2-3
mile range.
The maximum temperature for today is 53F degrees, which is 12 degrees
below the normal high of 65F. The minimum temperature since midnight
is 45F degrees, which is 2 degrees below the normal low of 47F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200ft, fog
Temperature: 45F; Dew Point: 45F; Relative Humidity: 100%
Wind: NNW @ 10G15 kts
Sea-level pressure: 1006.8 mb; 29.73 in. Hg: steady, then falling
Visibility: 3 miles, fog
6-hr Max temp: 47F
6-hr Min temp: 45F
24-hr Precip: 1.36 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 3F 068/45/45/3410G15/973/ 8//// 58008 70136 10047 20045
10 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle and fog
Temperature: 49F; Dew Point: 49F; Relative Humidity: 100%
Wind: NW @ 10G17 kts
Sea-level pressure: 1008.1 mb; 29.77 in. Hg: steady, then rising
Visibility: 2 miles, fog
3-hr Precip: 0.03 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 X W2 2L-F 081/49/49/3210G17/977/ 8//// 53013 6003/
1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus,
light drizzle and fog
Temperature: 53F Dew Point: 53F; Relative Humidity: 97%
Wind: WNW @ 11G19 kts
Sea-level pressure: 1010.0 mb; 29.83 in. Hg: rising unsteadily
Visibility: 3 miles, fog
6-hr Max temp: 53F
6-hr Min temp: 45F
6-hr Precip: 0.06 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E5 BKN 35 OVC 3L-F 010/53/53/3011G19/983/ 8/72/ 52019
6006/ 10053 20045
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SUMMARY FOR FRIDAY, MAY 9, 2025
TEMPERATURE (DEGREES F)
MAX…….51 NORMAL…..65
MIN…….46 NORMAL…..46
MEAN……49 NORMAL…..56
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-7
TOTAL DEPARTURE FOR THE MONTH………………………+39 [+4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….16 DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………….59 DEPARTURE…….-39
TOTAL HEATING UNITS FOR THE SEASON………….5457 DEPARTURE……-528
TOTAL HEATING UNITS LAST SEASON TO DATE……..5253 DEPARTURE……+204
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………0
TOTAL COOLING UNITS FOR THE SEASON…………….7 DEPARTURE………0
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 E @ 05:26 P.M.
VECTOR #1 (1-Sec)……….34 ENE @ 05:46 P.M.
VECTOR #2 (1-Sec)……….34 ENE @ 05:45 P.M.
DAVIS #1……………….33 E @ 05:25 P.M.
DAVIS #2 ………………33 E @ 05:46 P.M.
RMY #1 (Instantaneous)…..35 ENE @ 05:33 P.M.
RMY #2 (Instantaneous)…..35 ENE @ 02:17 P.M.
MERLIN…………………32 ENE
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 ENE @ 05:30 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 11:23 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26 @ 05:47 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 E @ 05:27 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 E @ 05:47 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 E @ 05:29 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 ENE @ 05:47 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.3 ENE [319 total miles]
VECTOR #1………………12.2
VECTOR #2………………13.4
DAVIS #1……………….13.7 ENE
DAVIS #2……………….13.6 E
RMY #1…………………12.5 ENE
RMY #2…………………13.1 ENE
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.36 DEPARTURE…..+1.25
TOTAL PRECIPITATION FOR THE MONTH…………..2.64 DEPARTURE…..+1.53
TOTAL PRECIPITATION FOR THE YEAR (2025)…….16.76 DEPARTURE…..-3.13
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 74/51/63/+8/0.04/0.0/…/.. 18 ESE VEC1 18 ESE RMY 18
5/9 51/46/49/-7/…./0.0/…/.. 33 E VEC1 34 ENE RMY 35
5/10 The low since midnight is 45F, the daily normal low is 47F.
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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 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRECIP 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990
RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRECIP 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945
TODAY’S REPORT PREPARED BY: Joshua Polen
