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

FRIDAY, MAY 2, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0438E
SUNSET: 1845E

EARLY MORNING STORM BRINGS MORE HUMID AIR, AFTERNOON SUNSHINE….

During the overnight, we experienced a thunderstorm which amounted to
0.19 inches of rain. This is a good start to the month but we are still
-4.72 inches for the season. The humid air mass that moved through left
us with patchy fog for much of the morning followed by sticky dew point
values once the skies cleared.

Temperatures were nearly similar to yesterday, but feel much more mild
since the air is much more humid today. We had an overnight low of 47F
and so far have reached 70F. With more daytime heating expected for this
afternoon it will probably get at least a couple degrees warmer. Our normal
high is 63F so we are already well above that.

Winds were a bit steady earlier on this morning but have since decreased
when the winds shifted from the coast to out of the SW. We have averaged
around 11mph for the day so far. The peak gust of 29mph took place just
before 5am and was out of the SE.

Visibility has been limited throughout the day due to the earlier
mentioned fog and then later by the pollen and higher dew points. We
have only averaged about 20 miles for much of today.

The maximum temperature for today is 70F degrees, which is 7 degrees
above the normal high of 63F. The minimum temperature since midnight
is 47F degrees, which is 3 degrees above the normal low of 44F.

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PRELIMINARY STATS FOR APRIL 2025

TEMPERATURE, Deg. F
Avg. Max. 59.6 [+3.3] Avg. Min. 38.9 [+1.0] Mean 49.3 [+2.2] 24-hour corrected mean: 49.3
Max. for month: 82F on the 19th
Min. for month: 24F on the 9th

HEATING DEGREE DAYS
Total heating units: 469 [-071] Total for the season: 5398 [-489] Total for last season: 5157

COOLING DEGREE DAYS
Total cooling units: 3 [ 000] Total for the season: 3 [ 000] Total for last season: 0

PRECIPITATION, Inches
Total: 3.41 [-1.35] Greatest in 24 hrs: 0.54 on the 11th-12th

SNOWFALL, Inches
Total: 1.7 [-1.1] Greatest in 24 hrs: 1.5 on the 11th-12th

WIND, mph
Avg. uncorrected wind speed: 12.9 mph
Avg. corrected wind speed: 13.2 mph
Prevailing wind direction: West-Northwest [16%] Peak gust and direction: 53 NW on the 15th and 20th

SUNSHINE:
Campbell-Stokes card minutes: 12072 of a possible 23250, or 52%
Astronomical total minutes: 12531 of a possible 24131 or 52%

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratus, few stratus fractus NNE-E
Temperature: 52F; Dew Point: 51F; Relative Humidity: 96%
Wind: S @ 11 kts
Sea-level pressure: 1012.9 mb; 29.91 in. Hg: falling, then
more slowly
Visibility: 20 miles, 30 miles NE-ESE, thin fog all quadrants
6-hr Max temp: 52F
6-hr Min temp: 47F
24-hr Precip: 0.19 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E11 OVC 20 129/52/51/1811/991/ FEW STFRA NNE-E THN F ALQDS
VSBY 30 NE-ESE/ 8/7// 56017 6019/ 70019 10052 20047

10 A.M.
Weather: Overcast stratus
Temperature: 58F; Dew Point: 56F; Relative Humidity: 92%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1012.1 mb; 29.89 in. Hg: falling, then
more slowly
Visibility: 20 miles, 30 miles NE-ESE, thin fog all quadrants
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E10 OVC 20 121/58/56/2206/989/ THN F ALQDS VSBY 30 E-SSE
WND LGT/ 8/6// 56008

1 P.M.
Weather: Few cumulus/stratocumulus, broken altocumulus, thinly broken cirrus
Temperature: 70F Dew Point: 61F; Relative Humidity: 72%
Wind: WSW @ 5 kts, wind light
Sea-level pressure: 1011.1 mb; 29.86 in. Hg: falling, then more rapidly
Visibility: 20 miles
6-hr Max temp: 70F
6-hr Min temp: 42F
6-hr Precip: Trace
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E180 BKN 220 BKN 250 -BKN 20 111/70/61/2405/986/ FEW CU/SC ALQDS
HAZY WND LGT/ 8/461 58010 6000/ 10070 20052

————————————————————–

SUMMARY FOR THURSDAY, MAY 1, 2025

TEMPERATURE (DEGREES F)
MAX…….69 NORMAL…..63
MIN…….43 NORMAL…..44
MEAN……56 NORMAL…..53

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+3
TOTAL DEPARTURE FOR THE MONTH……………………….+3 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..9 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………..9 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON………….5407 DEPARTURE……-492
TOTAL HEATING UNITS LAST SEASON TO DATE……..5174 DEPARTURE……+233

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………..0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………….3 DEPARTURE………0
TOTAL COOLING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+3

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)………..28 S @ 07:23 P.M.
VECTOR #1 (1-Sec)……….28 SSW @ 07:56 P.M.
VECTOR #2 (1-Sec)……….28 S @ 07:23 P.M.
DAVIS #1……………….31 S @ 07:24 P.M.
DAVIS #2 ………………34 S @ 07:04 P.M.
RMY #1 (Instantaneous)…..28 S @ 07:16 P.M.
RMY #2 (Instantaneous)…..30 S @ 07:23 P.M.
MERLIN…………………26 S
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 S @ 07:24 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 07:24 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 07:24 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 S @ 07:24 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 S @ 06:42 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 S @ 07:24 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 S @ 07:24 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.9 S [213 total miles] VECTOR #1……………….9.4
VECTOR #2……………….9.6
DAVIS #1………………..9.0 SSE
DAVIS #2………………..9.7 S
RMY #1………………….8.8 SSE
RMY #2………………….9.6 SSE
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.19 DEPARTURE…..+0.06
TOTAL PRECIPITATION FOR THE MONTH…………..0.19 DEPARTURE…..-0.06
TOTAL PRECIPITATION FOR THE YEAR (2025)…….14.31 DEPARTURE…..-4.72

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 APRIL 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/+3/0.19/0.0/…/.. 28 S VEC1 28 SSW RMY 28 TSTM

5/2 The low since midnight is 47F, the daily normal low is 44F.
————————————————————–

MAY DAILY RECORDS TO DATE

NONE.

4/1 55/32/44/+3/0.17/0.0/512/67 38 NW VEC1 38 NW RMY 40
4/2 42/27/35/-6/0.11/T/584/76 29 NNW VEC1 28 NNW RMY 29
4/3 62/32/47/+5/0.31/0.0/000/00 38 SW VEC1 38 SW RMY 39
4/4 69/47/58/+16/0.00/0.0/456/59 31 NW VEC1 31 NW RMY 30
4/5 47/36/42/-1/0.49/0.0/000/00 25 ESE VEC1 29 SE RMY 25
4/6 51/37/44/+1/0.20/0.0/016/02 22 NNW VEC1 21 NNW RMY 21
4/7 45/34/40/-4/0.18/T/000/00 24 E VEC1 23 NNE RMY 23
4/8 40/26/33/-11/0.10/0.1/196/25 51 W VEC1 48 W RMY 51
4/9 46/24/35/-9/0.00/0.0/755/96 36 WNW VEC1 33 NW RMY 36
4/10 49/29/39/-6/0.01/0.0/569/72 23 SSW VEC1 23 SSW RMY 25
4/11 45/31/38/-7/0.39/1.2/024/03 25 ENE VEC1 27 ENE RMY 26
4/12 36/33/35/-11/0.46/0.4/000/00 39 ENE VEC1 40 E RMY 42
4/13 42/35/39/-7/0.16/0.0/000/00 38 NE VEC1 38 NE RMY 40
4/14 67/35/51/+4/0.00/0.0/745/93 29 WNW VEC1 29 NNW RMY 28
4/15 66/44/55/+8/0.04/0.0/209/26 53 NW VEC1 51 NW RMY 54 TSTM
4/16 51/37/44/-3/T/0.0/484/60 44 WNW VEC1 43 WNW RMY 47
4/17 59/35/47/-1/0.00/0.0/800/99 35 WNW VEC1 34 WNW RMY 34
4/18 66/38/54/+4/0.00/0.0/617/76 41 SSW VEC1 42 SSW RMY 43
4/19 82/52/67/+18/T/0.0/383/47 40 WNW VEC1 40 W RMY 40
4/20 67/45/56/+7/0.00/0.0/768/94 53 NW VEC1 54 NW RMY 56
4/21 63/37/50/0/0.00/0.0/566/69 30 SSW VEC1 28 SSW RMY 31
4/22 75/44/60/+10/0.26/0.0/452/55 30 SSW VEC1 30 SSW RMY 30
4/23 72/43/58/+8/0.00/0.0/792/96 24 NW VEC1 23 NW RMY 26
4/24 74/45/60/+9/0.00/0.0/786/95 31 S VEC1 31 S RMY 30
4/25 78/52/65/+14/T/0.0/299/36 30 SSW VEC1 30 SSW RMY 30
4/26 59/49/54/+2/0.52/0.0/000/00 42 SSW VEC1 42 SSW RMY 43
4/27 56/41/49/-3/0.01/0.0/334/40 48 NW VEC1 48 NW RMY 56
4/28 74/43/59/+7/0.00/0.0/821/98 28 NW VEC1 27 NW RMY 27
4/29 78/53/66/+13/0.00/0.0/722/86 43 SSW VEC1 43 SSW RMY 46
4/30 73/50/62/+9/0.00/0.0/641/76 36 NW VEC1 35 NW RMY 38