Friday, May 30, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, MAY 30, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1913E
MUGGY CONDITIONS, SPOTTY SHOWERS TODAY….
Today has been mild with mostly cloudy skies today. We have seen
periods of brief sunshine, which have only resulted in increasing
clouds and the risk of spotty showers. We did receive a trace of
rain early this afternoon so far. The air has been very muggy today.
Temperatures have been mild today, which is part of the reason for
the spotty showers in the area. The overnight low was 57F and after
the sun came out, we quickly made it up to 74F before increasing
clouds moved in and cooled things down slightly. The dew points have
been in the low 60s all day which has made it feel very muggy. Only
the late morning breeze has given us any relief, even though it’s
out of the SW so the air is quite warm.
Winds were on the light side for most of the morning but started to
increase as unsettled weather made its way into the area by late
morning. Winds have been mostly out of the SW and SSW. The average
speed for the day so far is around 10mph. The peak gust of 27mph
occurred at 12:43pm this afternoon.
Visibility has been impacted by the high dew point, giving us hazy
conditions all throughout the day. This morning there was a thin
smoke layer, but dissipated by mid morning. We have varied between
10-25 miles of visibility today.
The maximum temperature for today is 74F degrees, which is 4 degrees
above the normal high of 70F. The minimum temperature since midnight
is 57F degrees, which is 5 degrees above the normal low of 52F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratocumulus, few breaks in overcast SSE-WSW,
sun dimly visible
Temperature: 60F; Dew Point: 60F; Relative Humidity: 98%
Wind: WSW @ 7 kts
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: falling, then more
slowly
Visibility: 10 miles, thin smoke layer along horizon, hazy
6-hr Max temp: 60F
6-hr Min temp: 57F
24-hr Precip: Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E8 OVC 10 081/60/60/2407/977/ FEW BINOVC SSE-WSW
THN K LYR ALNG HZN ALQDS SUN DMLY VSBL HAZY/ 8/5// 56008 70000
10060 20057
10 A.M.
Weather: Broken altocumulus, broken cirrostratus, few cumulus all
quadrants
Temperature: 71F; Dew Point: 60F; Relative Humidity: 68%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1006.3 mb; 29.72 in. Hg: falling unsteadily
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E85 BKN 220 BKN 25 063/71/60/2106/972/ FEW CU ALQDS HAZY
WND LGT/ 8/235 57018
1 P.M.
Weather: Broken stratocumulus, overcast altostratus, few breaks in
overcast distant NNE, virga distant NE-SE-SSW
Temperature: 71F Dew Point: 62F; Relative Humidity: 72%
Wind: SSW @ 7 kts
Sea-level pressure: 1003.6 mb; 29.64 in. Hg: falling, then more
slowly
Visibility: 20 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 60F
6-hr Precip: Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E85 OVC 20 036/71/62/2107/964/ FEW BINOVC ALQDS
FEW CU ALQDS VIRGA NNW-NNE HAZY/ 8/21/ 56027 6000/ 10074 20060
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SUMMARY FOR THURSDAY, MAY 29, 2025
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..70
MIN…….54 NORMAL…..52
MEAN……60 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-1
TOTAL DEPARTURE FOR THE MONTH………………………+28 [+0.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..5 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………209 DEPARTURE…….-38
TOTAL HEATING UNITS FOR THE SEASON………….5607 DEPARTURE……-527
TOTAL HEATING UNITS LAST SEASON TO DATE……..5365 DEPARTURE……+242
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………….13 DEPARTURE……..-9
TOTAL COOLING UNITS FOR THE SEASON……………16 DEPARTURE……..-9
TOTAL COOLING UNITS LAST SEASON TO DATE……….37 DEPARTURE…….-21
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)………..21 S @ 08:34 A.M.
VECTOR #1 (1-Sec)……….21 S @ 08:34 A.M.
VECTOR #2 (1-Sec)……….22 SSE @ 09:27 A.M.
DAVIS #1……………….23 S @ 08:34 A.M.
DAVIS #2 ………………26 S @ 08:33 A.M.
RMY #1 (Instantaneous)…..20 S @ 08:34 A.M.
RMY #2 (Instantaneous)…..23 SSE @ 09:27 A.M.
MERLIN…………………18 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SSE @ 09:26 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 09:26 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 09:29 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S @ 04:39 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 S @ 08:35 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 SSE @ 09:29 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 SSE @ 09:29 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.0 S [168 total miles]
VECTOR #1……………….7.5
VECTOR #2……………….7.9
DAVIS #1………………..7.0 S
DAVIS #2………………..7.7 S
RMY #1………………….7.4 S
RMY #2………………….8.0 S
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..7.35 DEPARTURE…..+3.80
TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.47 DEPARTURE…..-0.86
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/+8/0.04/0.0/474/55 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/-10/0.61/0.0/027/03 41 N VEC1 41 N RMY 42
5/24 60/46/53/-7/0.10/0.0/321/36 30 WNW VEC1 30 WNW RMY 31
5/25 59/47/53/-7/T/0.0/206/23 29 NW VEC1 29 NW RMY 31
5/26 70/45/58/-2/0.00/0.0/861/96 23 NNE VEC1 23 NNE RMY 23
5/27 79/50/65/+5/0.00/0.0/709/79 25 SSW VEC1 26 SSW RMY 26
5/28 78/55/67/+6/0.01/0.0/666/74 25 SSW VEC1 24 SSW RMY 26
5/29 65/54/60/-1/0.04/0.0/…/.. 21 S VEC1 21 S RMY 20
5/30 The low since midnight is 57F, 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 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.41 INS 2024
PEAK GUST 61e MPH NW IN 1945
RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945
TODAY’S REPORT PREPARED BY: Amanda Joly
