Tuesday, April 29, 2025

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

TUESDAY, APRIL 29, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0442E
SUNSET: 1842E

PLENTY OF SUNSHINE WITH WARM TEMPERATURES AND A GUSTY BREEZE….

Despite the high thin cirrus clouds, abundant sunshine has been the
theme once again today with well above normal temperatures. The only
“negative” one can find today is the amount of pollen in the air,
which has actually reduced visibility quite a bit late this morning
into early this afternoon.

Temperatures have warmed well into the 70s today, and are getting
close to 80F. While it is quite warm for this time of year, it isn’t
quite at record levels. For reference, the record high for today is
85F set in 1974. Dew point values have slowly increased from the mid
30s early this morning to the low to mid 40s early this afternoon.

Winds have become quite gusty as the day has progressed. A southwest
to west-southwest wind has been gradually increasing with an average
for the day so far of around 16mph. Frequent gusts over 30mph have
been occurring since the mid morning hours. A gust of 37mph occurred
during the 10am observation period, which has been the peak for the
day so far.

Visibility decreased from around 60 miles early this morning to only
around 30-40 miles by late this morning and into this afternoon. The
reduction is due to increased haziness from the very high pollen
count.

The maximum temperature for today is 78F degrees, which is 16 degrees
above the normal high of 62F. The minimum temperature since midnight
is 53F degrees, which is 10 degrees above the normal low of 43F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus
Temperature: 59F; Dew Point: 36F; Relative Humidity: 42%
Wind: SW @ 12 kts
Sea-level pressure: 1022.6 mb; 30.20 in. Hg: rising, then falling
Visibility: 60 miles
6-hr Max temp: 59F
6-hr Min temp: 53F
24-hr Precip: 0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 -BKN 60 226/59/36/2212/020/ 8/001 58002 10059 20053

10 A.M.
Weather: Thin broken cirrus
Temperature: 72F; Dew Point: 40F; Relative Humidity: 30%
Wind: WSW @ 20G32 kts, peak wind SW 37mph at 9:47 A.M.
Sea-level pressure: 1019.9 mb; 30.12 in. Hg: falling, then more slowly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 -BKN 30 199/72/40/2420G32/012/ HAZY PK WND 2332/47/
8/001 56027

1 P.M.
Weather: Thin scattered cirrus
Temperature: 78F Dew Point: 43F; Relative Humidity: 29%
Wind: SW @ 21G31 kts, peak wind SSW 36mph at 12:50 P.M.
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 59F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 250 -SCT 40 168/78/43/2221G31/003/ HAZY PK WND 2131/50/
8/001 58031 10078 20059

————————————————————–

SUMMARY FOR MONDAY, APRIL 28, 2025

TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..62
MIN…….43 NORMAL…..43
MEAN……59 NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+7
TOTAL DEPARTURE FOR THE MONTH………………………+47 [+1.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..6 DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH……………466 DEPARTURE…….-49
TOTAL HEATING UNITS FOR THE SEASON………….5395 DEPARTURE……-467
TOTAL HEATING UNITS LAST SEASON TO DATE……..5141 DEPARTURE……+254

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………..2 DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………….2 DEPARTURE………0
TOTAL COOLING UNITS LAST SEASON TO DATE………..0 DEPARTURE……..+2

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 NW @ 11:38 A.M.
VECTOR #1 (1-Sec)……….27 NW @ 05:33 A.M.
VECTOR #2 (1-Sec)……….28 NW @ 07:42 A.M.
DAVIS #1……………….26 WNW @ 11:38 A.M.
DAVIS #2 ………………29 S @ 06:45 P.M.
RMY #1 (Instantaneous)…..27 NW @ 05:33 A.M.
RMY #2 (Instantaneous)…..28 NW @ 07:42 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 NNW @ 04:03 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18 @ 07:05 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 07:04 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 NW @ 04:05 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 NNW @ 07:04 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 NNW @ 07:05 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 NW @ 07:04 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.5 NNW [252 total miles] VECTOR #1………………10.8
VECTOR #2………………10.9
DAVIS #1……………….10.7 NW
DAVIS #2……………….10.6 NNW
RMY #1…………………10.5 WNW
RMY #2…………………10.9 WNW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..3.41 DEPARTURE…..-1.07
TOTAL PRECIPITATION FOR THE YEAR (2025)…….14.12 DEPARTURE…..-4.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-1.1
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

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/…/.. 31 S VEC1 31 S RMY 30
4/25 78/52/65/+14/T/0.0/…/.. 30 SSW VEC1 30 SSW RMY 30
4/26 59/49/54/+2/0.52/0.0/…/.. 42 SSW VEC1 42 SSW RMY 43
4/27 56/41/49/-3/0.01/0.0/…/.. 48 NW VEC1 48 NW RMY 56
4/28 74/43/59/+7/0.00/0.0/…/.. 28 NW VEC1 27 NW RMY 27