Thursday, May 29, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, MAY 29, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1912E
OVERCAST WITH PERIODS OF LIGHT DRIZZLE….
As a very weak low pressure system passes to the south of the region,
clouds have been stuck over the area all day. There were enough thin
spots in the clouds at times this morning to allow for a few peeks
of sunshine here and there. Some light rain crossed the area over-
night in association with the developing low pressure which brought
0.05″ of rain by the 7am observation this morning. Since then, only
some periods of mainly light drizzle have occurred leaving only a
trace through 1pm.
Temperatures are of course cooler today than the past couple of days
thanks to the cloud cover. Readings have reached the mid 60s by
early this afternoon, which is below normal for late May. The dew
point has been holding generally in the mid to upper 50s through the
day.
Winds have been gradually diminishing from the steady values of the
early to mid morning hours. Speeds were generally around 10mph during
those hours, but have slowed to around 5-7mph on average over the
past couple of hours. The overall average speed for the day so far is
around 9mph. The peak gust of course was this morning, occurring just
after 8:30am with a value of 21mph.
Visibility has been somewhat variable today due to the areas of
drizzle. On the whole it’s been averaging around 40 miles most of
the day with lower values in various sectors at times.
The maximum temperature for today is 65F degrees, which is 5 degrees
below the normal high of 70F. The minimum temperature since midnight
is 54F degrees, which is 2 degrees above the normal low of 52F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Overcast altocumulus/altostratus, few thin spots in overcast,
few lower stratus fractus distant all quadrants, few stratocumulus distant
ESE-S-W, few altocumulus castellanus distant NE-E, virga distant NW-N-E
Temperature: 59F; Dew Point: 57F; Relative Humidity: 94%
Wind: S @ 7G13 kts
Sea-level pressure: 1020.7 mb; 30.14 in. Hg: falling, then steady
Visibility: 40 miles, thin fog
6-hr Max temp: 59F
6-hr Min temp: 54F
24-hr Precip: 0.05 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E95 OVC 40 207/59/57/1807G13/014/ FEW THN SPTS IOVC
FEW LWR STFRA DSNT ALQDS FEW SC DSNT ESE-S-W FEW ACC DSNT NE-E
THN F ALQDS VIRGA DSNT NW-N-E/ 8/57/ 56007 6003/ 70005 10059 20054
10 A.M.
Weather: Overcast stratocumulus, very light drizzle, few breaks in
overcast distant NNE-E, higher clouds visible distant NNE-E
Temperature: 62F; Dew Point: 56F; Relative Humidity: 81%
Wind: SSW @ 8G15 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling, then more rapidly
Visibility: 40 miles, 10 miles SSW-W
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 E25 OVC 40L- 195/62/56/1608G15/011/ FEW BINOVC DSNT NNE-E
HIER CLDS VSBL DSNT NNE-E L-B52 PCPN VRY LGT VSBY 10 SSW-W/ 8/5//
58012 6000/
1 P.M.
Weather: Broken stratocumulus, overcast altostratus, few breaks in
overcast distant NNE, virga distant NE-SE-SSW
Temperature: 64F Dew Point: 57F; Relative Humidity: 78%
Wind: SE @ 5 kts, wind light
Sea-level pressure: 1016.4 mb; 30.01 in. Hg: falling, then more rapidly
Visibility: 40 miles, 15 miles E-S
6-hr Max temp: 65F
6-hr Min temp: 59F
6-hr Precip: Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E25 BKN 50 OVC 40 164/64/57/1405/001/ FEW BINOVC DSNT NNE
VIRGA DSNT NE-SE-SSW SUN DMLY VSBL VSBY 15 E-S WND LGT/ 8/52/ 58031
6000/ 10065 20059
————————————————————–
SUMMARY FOR WEDNESDAY, MAY 28, 2025
TEMPERATURE (DEGREES F)
MAX…….78 NORMAL…..70
MIN…….55 NORMAL…..52
MEAN……67 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+6
TOTAL DEPARTURE FOR THE MONTH………………………+29 [+0.8 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…….-38
TOTAL HEATING UNITS FOR THE SEASON………….5602 DEPARTURE……-527
TOTAL HEATING UNITS LAST SEASON TO DATE……..5365 DEPARTURE……+237
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..2 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH…………….13 DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE SEASON……………16 DEPARTURE……..-7
TOTAL COOLING UNITS LAST SEASON TO DATE……….36 DEPARTURE…….-20
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 @ 07:37 P.M.
VECTOR #1 (1-Sec)……….24 SSW @ 07:37 P.M.
VECTOR #2 (1-Sec)……….25 SSW @ 07:36 P.M.
DAVIS #1……………….28 S @ 07:53 P.M.
DAVIS #2 ………………30 S @ 02:25 P.M.
RMY #1 (Instantaneous)…..26 SSW @ 07:37 P.M.
RMY #2 (Instantaneous)…..26 SSW @ 07:36 P.M.
MERLIN…………………23 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SW @ 09:28 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 04:45 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 04:55 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 S @ 04:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S @ 04:26 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 SSW @ 08:16 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SSW @ 04:55 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.0 SW [263 total miles]
VECTOR #1………………11.2
VECTOR #2………………11.7
DAVIS #1……………….10.9 SSW
DAVIS #2……………….11.7 SW
RMY #1…………………11.0 SW
RMY #2…………………11.8 SSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.05 DEPARTURE…..-0.08
TOTAL PRECIPITATION FOR THE MONTH…………..7.35 DEPARTURE…..+3.94
TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.47 DEPARTURE…..-0.72
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/-10/0.61/0.0/027/03 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 The low since midnight is 54F, the daily normal low is 52F.
————————————————————–
MAY DAILY RECORDS TO DATE
5/16 RECORD HIGH MINIMUM TEMPERATURE OF 61F;
PREVIOUS RECORD WAS 60F SET IN 2014
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
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
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
TODAY’S REPORT PREPARED BY: MFD
