Wednesday, May 28, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, MAY 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0412E
SUNSET: 1912E
INCREASING AND THICKENING CLOUD COVER TODAY, BUT STILL WARM….
We started the day with a good deal of sunshine, however the high
thin cirrus clouds have increased and thickened as the day moved
into the early afternoon hours. Sunshine at this point is filtered
at best. All of this is in advance of our next system slated to
bring some rain to the region tomorrow.
Temperatures are on the warm side again today with readings reaching
the mid 70s. The dew point has been increasing a bit as well, from
the low 50s early this morning to the mid 50s by early this afternoon.
Regardless, it’s still rather comfortable out there and has been a
nice day overall weather-wise.
The wind is not as light as yesterday, but still nothing to write
home about. The average speed for the day so far is around 10mph,
mainly out of a southwesterly direction. The gusts are starting to
push upwards as we approached the noon hour, with a peak so far of
20mph occurring just after 11am.
Visibility has been decreasing as the day progresses, thanks to both
an increase in moisture and pollen. The view has dropped from around
60 miles early this morning to only 40 miles by early this afternoon.
The maximum temperature for today is 77F degrees, which is 7 degrees
above the normal high of 70F. The minimum temperature since midnight
is 55F degrees, which is 3 degrees above the normal low of 52F.
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Today’s Observations:
7 A.M.
Weather: Thin broken cirrus
Temperature: 62F; Dew Point: 52F; Relative Humidity: 69%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1026.9 mb; 30.32 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 62F
6-hr Min temp: 55F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 -BKN 60 269/62/52/2406/032/ WND LGT/ 8/001 51007
10062 20055
10 A.M.
Weather: Thin broken cirrus, few cumulus distant NW
Temperature: 74F; Dew Point: 55F; Relative Humidity: 51%
Wind: SW @ 7 kts
Sea-level pressure: 1026.8 mb; 30.32 in. Hg: rising, then falling
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 -BKN 40 268/74/55/2207/032/ FEW CU DSNT NW HAZY/
8/201 58001
1 P.M.
Weather: Thin broken cirrus, few cumulus distant WSW-NW-NNE
Temperature: 77F Dew Point: 54F; Relative Humidity: 45%
Wind: SSW @ 9 kts
Sea-level pressure: 1025.8 mb; 30.29 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E250 -BKN 40 258/77/54/2109/029/ FEW CU DSNT WSW-NW-NNE
HAZY/ 8/201 58010 10077 20062
————————————————————–
SUMMARY FOR TUESDAY, MAY 27, 2025
TEMPERATURE (DEGREES F)
MAX…….79 NORMAL…..70
MIN…….50 NORMAL…..51
MEAN……65 NORMAL…..60
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+5
TOTAL DEPARTURE FOR THE MONTH………………………+23 [+0.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH……………204 DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON………….5602 DEPARTURE……-521
TOTAL HEATING UNITS LAST SEASON TO DATE……..5365 DEPARTURE……+237
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….11 DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE SEASON……………14 DEPARTURE……..-8
TOTAL COOLING UNITS LAST SEASON TO DATE……….30 DEPARTURE…….-13
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)………..25 SSW @ 04:48 P.M.
VECTOR #1 (1-Sec)……….26 SSW @ 04:11 P.M.
VECTOR #2 (1-Sec)……….25 SSW @ 04:19 P.M.
DAVIS #1……………….28 S @ 04:43 P.M.
DAVIS #2 ………………29 S @ 04:19 P.M.
RMY #1 (Instantaneous)…..26 SSW @ 04:48 P.M.
RMY #2 (Instantaneous)…..26 SSW @ 04:19 P.M.
MERLIN…………………23 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SSW @ 05:13 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 04:44 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 @ 04:44 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 S @ 04:45 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S @ 04:45 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SSW @ 04:21 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SSW @ 04:44 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.5 SSW [181 total miles]
VECTOR #1……………….8.1
VECTOR #2……………….8.3
DAVIS #1………………..7.7 SW
DAVIS #2………………..8.0 SW
RMY #1………………….7.9 WSW
RMY #2………………….8.4 WSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..7.30 DEPARTURE…..+4.02
TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.42 DEPARTURE…..-0.64
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
————————————————————–
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/+8/0.04/0.0/474/55 18 ESE VEC1 18 ESE RMY 18
5/9 51/46/49/-7/1.15/0.0/000/00 33 E VEC1 34 ENE RMY 35
5/10 62/45/54/-2/0.29/0.0/121/14 36 NW VEC1 37 NW RMY 41 TSTM
5/11 70/49/60/+4/0.00/0.0/851/98 33 NW VEC1 32 NW RMY 34
5/12 73/46/60/+3/0.00/0.0/853/98 36 SW VEC1 34 SW RMY 36
5/13 70/51/61/+4/0.00/0.0/759/87 26 ESE VEC1 27 ESE RMY 26
5/14 73/48/61/+4/0.00/0.0/586/67 18 SSE VEC1 19 SSE RMY 17
5/15 72/58/65/+8/0.62/0.0/079/09 20 SSE VEC1 20 SSE RMY 19 TSTM
5/16 78/61/70/+12/0.00/0.0/404/46 23 SW VEC1 23 SSW RMY 23
5/17 76/58/67/+9/T/0.0/264/30 30 S VEC1 29 S RMY 30
5/18 68/54/61/+3/T/0.0/512/58 39 W VEC1 39 W RMY 38
5/19 63/46/55/-3/0.00/0.0/371/42 41 NW VEC1 42 NW RMY 44
5/20 55/45/50/-9/T/0.0/000/00 29 NNW VEC1 29 NNW RMY 30
5/21 48/43/46/-13/0.01/0.0/009/01 28 E VEC1 28 E RMY 27
5/22 45/42/44/-15/3.24/0.0/000/00 46 NE VEC1 46 NE RMY 48 TSTM
5/23 56/41/49/-10/0.61/0.0/…/.. 41 N VEC1 41 N RMY 42
5/24 60/46/53/-7/0.10/0.0/…/.. 30 WNW VEC1 30 WNW RMY 31
5/25 59/47/53/-7/T/0.0/…/.. 29 NW VEC1 29 NW RMY 31
5/26 70/45/58/-2/0.00/0.0/…/.. 23 NNE VEC1 23 NNE RMY 23
5/27 79/50/65/+5/0.00/0.0/…/.. 25 SSW VEC1 26 SSW RMY 26
5/28 The low since midnight is 55F, the daily normal low is 52F.
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MAY DAILY RECORDS TO DATE
5/16 RECORD HIGH MINIMUM TEMPERATURE OF 61F;
PREVIOUS RECORD WAS 60F SET IN 2014
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946
RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945
TODAY’S REPORT PREPARED BY: MFD
