Sunday, April 27, 2025

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

SUNDAY, APRIL 27, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0445E
SUNSET: 1840E

BRIEF SUN GAVE WAY TO CLOUDS AND A FEW LIGHT RAIN SHOWERS….

The sky was clear briefly this morning allowing for a very nice
sunrise, however clouds quickly moved in followed by mainly very
light rain showers. A mid level system pinwheeled around a larger
system well off to the northeast is responsible for the clouds and
showers. Clouds are trying to break early this afternoon, but with
a cold pool of air aloft, any sun will just help to re-develop
more cloud cover. The rainfall this morning has only amounted to a
trace.

Temperatures are much cooler than they have been with readings all
morning holding in the mid to upper 40s. The mercury has finally
pushed into the mid 50s early this afternoon, but this is still a
far cry from the 70s and 80s we experienced on Friday. It is also
a few degrees below normal levels for the date. Dew point values
have generally been in the 30s all day.

Winds continue to be on the busy side with a west-northwest flow
averaging at around 17mph for the day so far. Gusts over 30mph
have been fairly common today, with a peak gust so far of 43mph
occurring just before 12:45pm.

Visibility has been variable, starting the day around 50 miles,
then lowering with the rain showers to as low as 15-20 miles, then
recovering early this afternoon to around 60-70 miles.

The maximum temperature for today is 56F degrees, which is 5 degrees
below the normal high of 61F. The minimum temperature since midnight
is 41F degrees, which is 1 degree below the normal low of 42F.

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Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered cirrus, virga distant NW-N
Temperature: 46F; Dew Point: 33F; Relative Humidity: 59%
Wind: W @ 18G31 kts, peak wind W 36mph at 6:53 A.M.
Sea-level pressure: 1007.0 mb; 29.74 in. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 47F
6-hr Min temp: 41F
24-hr Precip: 0.47 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 44 SCT 250 SCT 50 070/46/33/2818G31/974/ VIRGA DSNT NW-N
PK WND 2731/53/ 8/501 50000 70047 10047 20041

10 A.M.
Weather: Broken stratocumulus, overcast nimbostratus, very light rain
showers
Temperature: 45F; Dew Point: 39F; Relative Humidity: 79%
Wind: WNW @ 15G26 kts, peak wind WNW 31mph at 9:27 A.M.
Sea-level pressure: 1008.2 mb; 29.77 in. Hg: rising, then more rapidly
Visibility: 40 miles, 20 miles NW, thin fog
3-hr Precip: Trace
3-hr Snowfall: 0.0 inches
BHO SA 1455 E30 BKN 50 OVC 40RW- 082/45/39/3015G26/977/ THN F ALQDS
RW-E12B32 PCPN VRY LGT VSBY 20 NW PK WND 2927/27/ 8/52/ 53012 6000/

1 P.M.
Weather: Broken stratocumulus, broken stratocumulus lenticularis,
broken altocumulus
Temperature: 55F Dew Point: 37F; Relative Humidity: 50%
Wind: WNW @ 18G33 kts, peak wind NW 43mph at 12:41 P.M.
Sea-level pressure: 1007.9 mb; 29.76 in. Hg: falling, then rising
Visibility: 70 miles
6-hr Max temp: 56F
6-hr Min temp: 44F
6-hr Precip: 0.01 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E40 BKN 50 BKN 65 BKN 70 079/55/37/3018G33/976/ VIRGA ALQDS
PK WND 3137/41/ 8/560 55003 6001/ 10056 20044

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SUMMARY FOR SATURDAY, APRIL 26, 2025

TEMPERATURE (DEGREES F)
MAX…….59 NORMAL…..61
MIN…….49 NORMAL…..42
MEAN……54 NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH………………………+43 [+1.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….11 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………444 DEPARTURE…….-45
TOTAL HEATING UNITS FOR THE SEASON………….5373 DEPARTURE……-462
TOTAL HEATING UNITS LAST SEASON TO DATE……..5117 DEPARTURE……+256

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)………..42 SSW @ 10:06 A.M.
VECTOR #1 (1-Sec)……….42 SSW @ 09:43 A.M.
VECTOR #2 (1-Sec)……….41 S @ 09:49 A.M.
DAVIS #1……………….47 S @ 11:55 A.M.
DAVIS #2 ………………50 S @ 10:44 A.M.
RMY #1 (Instantaneous)…..43 SSW @ 11:54 A.M.
RMY #2 (Instantaneous)…..45 S @ 09:50 A.M.
MERLIN…………………38 S
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 SSW @ 11:48 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..31 @ 09:42 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30 @ 09:49 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………31 S @ 09:42 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………34 S @ 10:46 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..30 SSW @ 09:42 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..31 S @ 09:49 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..17.7 SSW [425 total miles] VECTOR #1………………17.6
VECTOR #2………………18.2
DAVIS #1……………….17.4 SSW
DAVIS #2……………….19.0 SSW
RMY #1…………………17.1 SSW
RMY #2…………………18.3 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.47 DEPARTURE…..+0.32
TOTAL PRECIPITATION FOR THE MONTH…………..3.40 DEPARTURE…..-0.79
TOTAL PRECIPITATION FOR THE YEAR (2025)…….14.11 DEPARTURE…..-4.10

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……-1.0
TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.8

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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