Saturday, May 31, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, MAY 31, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0410E
SUNSET: 1914E
SHOWERS THIS MORNING, A BRIEF INTERMISSION, THEN MORE RAIN….
The morning here began with rain, which moved through rather quickly,
only accumulating 0.20″. Some drizzle and fog persisted for a bit
before the overcast broke for some sunshine by late morning! By noon,
clouds filled back in, accompanied by occasional drizzle and light rain
as the low center continues to spin to our west.
Temperatures are a touch below normal, with a low this morning in the
upper 50s and a high in the mid 60s, which occurred while the sun was out.
Now that the clouds have returned, temperatures have dropped back to the
upper 50s. The dew point has dropped a touch as well, from the low
60s this morning to the upper 50s.
Winds began on the lighter side before picking up by mid morning with flow
out of the south. The average speed thus far is 13mph, with a peak gust to
around 39mph just after 10am.
As should be anticipated, visibility has been variable today. Dense fog
this morning limited views to 1/8 of a mile. After the low overcast broke,
views improved to 40 miles, before retreating back to 10 miles due to
light rain and thin fog in the afternoon.
The maximum temperature for today is 66F degrees, which is 5 degrees
below the normal high of 71F. The minimum temperature since midnight
is 58F degrees, which is 5 degrees above the normal low of 53F.
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Today’s Observations:
7 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle and fog
Temperature: 60F; Dew Point: 60F; Relative Humidity: 100%
Wind: SE @ 10 kts
Sea-level pressure: 988.9 mb; 29.20 in. Hg: falling unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 60F
6-hr Min temp: 58F
24-hr Precip: 0.20 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 X W2 1/8L-F 889/60/60/1410/920/ 8//// 57042 6020/ 70020
10060 20058
10 A.M.
Weather: Broken cumulus
Temperature: 64F; Dew Point: 56F; Relative Humidity: 76%
Wind: SSW @ 21G32 kts, peak wind SSW 37mph @ 9:51am
Sea-level pressure: 986.1 mb; 29.12 in. Hg: falling, then more slowly
Visibility: 40 miles
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 E25 BKN 40 861/64/56/2021G32/912/ PK WND 2032/51/ 8/200
56028 6000/
1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus, light rain
Temperature: 59F Dew Point: 57F; Relative Humidity: 93%
Wind: S @ 12G17 kts
Sea-level pressure: 984.3 mb; 29.07 in. Hg: falling, then more slowly
Visibility: 10 miles, 20 miles WSW-WNW, thin fog all quadrants
6-hr Max temp: 66F
6-hr Min temp: 59F
6-hr Precip: Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E15 BKN 30 OVC 10R- 843/59/57/1912G17/907/ THN F ALQDS
VSBY 20 WSW-WNW/ 8/72/ 56018 6000/ 10066 20059
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SUMMARY FOR FRIDAY, MAY 30, 2025
TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..70
MIN…….57 NORMAL…..52
MEAN……66 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+5
TOTAL DEPARTURE FOR THE MONTH………………………+33 [+0.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………209 DEPARTURE…….-43
TOTAL HEATING UNITS FOR THE SEASON………….5607 DEPARTURE……-532
TOTAL HEATING UNITS LAST SEASON TO DATE……..5376 DEPARTURE……+231
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..1 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….14 DEPARTURE……..-9
TOTAL COOLING UNITS FOR THE SEASON……………17 DEPARTURE……..-9
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)………..30 S @ 07:00 P.M.
VECTOR #1 (1-Sec)……….32 S @ 07:00 P.M.
VECTOR #2 (1-Sec)……….30 SSW @ 05:50 P.M.
DAVIS #1……………….31 S @ 02:46 P.M.
DAVIS #2 ………………37 S @ 07:00 P.M.
RMY #1 (Instantaneous)…..30 SSW @ 02:20 P.M.
RMY #2 (Instantaneous)…..32 SSW @ 05:53 P.M.
MERLIN…………………27 S
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 SSW @ 02:22 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 02:22 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 02:22 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 S @ 02:22 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S @ 06:52 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 SSW @ 02:22 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 SSW @ 05:52 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.6 SSW [278 total miles]
VECTOR #1………………11.8
VECTOR #2………………12.6
DAVIS #1……………….11.5 SSW
DAVIS #2……………….12.8 SSW
RMY #1…………………11.6 SSW
RMY #2…………………12.6 SSW
RICHARDS (C5C)…………..OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.20 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE MONTH…………..7.55 DEPARTURE…..+3.87
TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.67 DEPARTURE…..-0.79
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 74/57/66/+5/T/0.0/…/.. 30 S VEC1 32 S RMY 30
5/31 The low since midnight is 58F, 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 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
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
TODAY’S REPORT PREPARED BY: Joshua Polen
