Sunday, June 1, 2025

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

SATURDAY, JUNE 1, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0410E
SUNSET:  1915E

BREEZY AND OVERALL COOL CONDITIONS TO START METEOROLOGICAL
SUMMER….

The last day of May proved to be a wet one as we got 0.27 inches
total for the day. This brings our monthly total to 7.62 inches,
making it the 8th wettest May on record. Below are the years with
the highest May precipitation, as compiled by our chief scientist,
Mike Iacono.

BHO Highest May Precipitation, inches (1885-2025):

1) 10.10 in 2006
2) 9.16 in 1954
3) 9.14 in 1984
4) 8.65 in 2005
5) 8.18 in 1998
6) 7.91 in 1967
7) 7.81 in 1990
8) 7.62 in 2025
9) 7.55 in 1920
10) 6.80 in 2002

Temperatures have remained below normal as the weak disturbance
moved offshore this morning. Increasing clouds and gusty winds
have suppressed the temperatures, but the dry, cooler air has
helped with the humidity and dew point, making for a comfortable
start to June.

We have had a predominantly westerly flow this morning and it has
been quite breezy for much of the day. Winds have averaged about
16mph, with frequent gusts in the 20-25 mph range. Our peak gust
of 40mph occurred just before 8am this morning.

Visibility has been between 40-50 miles for much of the day, with
a slight improvement in the early afternoon hours.

The maximum temperature for today is 61F degrees, which is 10 degrees
below the normal high of 71F. The minimum temperature since midnight
is 47F degrees, which is 6 degrees above the normal low of 53F.

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PRELIMINARY STATS FOR MAY 2025

TEMPERATURE, Deg. F
Avg. Max. 67.0 [+0.2] Avg. Min. 49.3 [+1.1] Mean      58.2 [+0.7] 24-hour corrected mean: 57.4
Max. for month: 84F on the  3rd
Min. for month: 41F on the 23rd

HEATING DEGREE DAYS
Total heating units:    217 [-041] Total for the season:  5615 [-530] Total for last season: 5379

COOLING DEGREE DAYS
Total cooling units:     14 [-011] Total for the season:    17 [-011] Total for last season:   37

PRECIPITATION, Inches
Total: 7.62 [+3.80] Greatest in 24 hrs: 3.73 on the 22nd-23rd

SNOWFALL, Inches
Total: 0.0 [ 0.0] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 11.2 mph
Avg. corrected wind speed:   11.6 mph
Prevailing wind direction:   South-Southwest [16%] Peak gust and direction:  46 NE on the 22nd, W on the 31st

SUNSHINE:
Campbell-Stokes card minutes: 10506 of a possible 26226, or 40%
Astronomical total minutes: 10897 of a possible 27191 or 40%

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Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few stratocumulus all quadrants
Temperature: 53F; Dew Point: 47F; Relative Humidity: 81%
Wind: W @ 16G22 kts
Sea-level pressure: 1000.0 mb; 29.53 in. Hg: rising, then more
slowly
Visibility: 40 miles
6-hr Max temp: 53F
6-hr Min temp: 47F
24-hr Precip:  0.09 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 250 SCT 40 000/53/47/2616G22/953/ FEW SC ALQDS/
8/501 51022 6001/ 70009 10053 20047

10 A.M.
Weather: Broken stratocumulus
Temperature: 57F; Dew Point: 42F; Relative Humidity: 57%
Wind: SSW @ 10G27 kts, peak wind W 40mph at 9:13 A.M.
Sea-level pressure: 1002.0 mb; 29.59 in. Hg: falling unsteadily
Visibility: 40 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E40 BKN 40 020/57/42/2710G27/959/ PK WND 2735/13/
8/500 52200

1 P.M.
Weather: Overcast stratocumulus, few breaks in overcast all quadrants
Temperature: 58F Dew Point: 43F; Relative Humidity: 54%
Wind: S @ 14G24 kts, peak wind W 35mph at 11:58 A.M.
Sea-level pressure: 1004.0 mb; 29.65 in. Hg: falling unsteadily
Visibility: 50 miles
6-hr Max temp: 61F
6-hr Min temp: 53F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E45 OVC 50 040/58/43/2814G25/965/ FEW BINOVC ALQDS
PK WND 2730/58 8/5// 52200 10061 20053
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SUMMARY FOR SATURDAY, MAY 31, 2025

TEMPERATURE (DEGREES F)
MAX…….66   NORMAL…..71
MIN…….47   NORMAL…..53
MEAN……57   NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5
TOTAL DEPARTURE FOR THE MONTH………………………+28 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..8  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………217  DEPARTURE…….-41
TOTAL HEATING UNITS FOR THE SEASON………….5615  DEPARTURE……-530
TOTAL HEATING UNITS LAST SEASON TO DATE……..5379  DEPARTURE……+236

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………….14  DEPARTURE…….-11
TOTAL COOLING UNITS FOR THE SEASON……………17  DEPARTURE…….-11
TOTAL COOLING UNITS LAST SEASON TO DATE……….37  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)………..46 W    @   04:26 P.M.
VECTOR #1 (1-Sec)……….46 W    @   04:26 P.M.
VECTOR #2 (1-Sec)……….46 W    @   07:03 P.M.
DAVIS #1……………….48 S    @   10:59 A.M.
DAVIS #2 ………………49 S    @   10:40 A.M.
RMY #1 (Instantaneous)…..49 W    @   03:42 P.M.
RMY #2 (Instantaneous)…..48 W    @   07:03 P.M.
MERLIN…………………47 W
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 W    @   04:00 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..33      @   03:58 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..31      @   03:58 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………35 W    @   03:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S    @   11:12 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..31 W    @   03:59 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 S    @   10:57 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.6 W [351 total miles] VECTOR #1………………14.7
VECTOR #2………………15.3
DAVIS #1……………….15.0 SW
DAVIS #2……………….15.4 SW
RMY #1…………………14.1 SSW
RMY #2…………………15.2 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.09 DEPARTURE…..-0.05
TOTAL PRECIPITATION FOR THE MONTH…………..7.62 DEPARTURE…..+3.80
TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.75 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/-1/0.04/0.0/027/03        21 S   VEC1 21 S   RMY 20
5/30  74/57/66/+5/T/0.0/433/48           30 S   VEC1 32 S   RMY 30
5/31  66/47/57/-5/0.27/0.0/154/17        46 W   VEC1 46 W   RMY 49

6/1 The low since midnight is 47F, the daily normal low is 53F.

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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 JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month] PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952

RECORDS FOR JUNE 2
HIGH 91F IN 1895
LOW 41F IN 1907, 1929
PRECIP 2.36 INS IN 1982
SNOWFALL TRACE IN 1907 (ICE PELLETS)
PEAK GUST 63 MPH NW IN 2000

TODAY’S REPORT PREPARED BY: Amanda Joly