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Friday, June 25, 2021

June 25, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JUNE 25, 2021ALL TIMES ARE IN EASTERN STANDARD…

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

FRIDAY, JUNE 25, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0409E
SUNSET:  1925E

RAIN AND FOG OVERCOME THE HILL, MINOR IMPROVEMENT
INTO THE AFTERNOON…

After back-to-back days filled with sunshine, refreshing
dew points and pleasant overnight lows, we are now entering
the beginning stages of returning to “Triple H” weather.

A warm front lifted through the region this morning –
accompanied by fog and light rain. The gauge recorded
0.11″ at 7A. Temperature and dew point equalled one another
at 58F, with afternoon readings increasing slightly to
63F and 63F respectively. This has kept the summit
shrouded in fog.

Winds have been easing throughout the day, averaging 10 MPH
in the morning slipping to 7 MPH as the afternoon arrived.
High pressure continues to slowly push to the east and as it
does so, the flood gates are now open to hazy, hot, and humid
weather.

The high temperature so far today is 63F, this is 15 degrees
below the normal maximum of 78F. The low temperature so
far today is 58F, which is 2 degrees below the normal
minimum of 60F.

Today’s Observations:

7 A.M.
Weather: Very Light Rain, Fog (Sky Obscured, Vertical Visibility 200 ft)
Temperature: 58F; Dew Point: 58F; Relative Humidity: 100%
Wind: NE @ 8 kts
Sea-level pressure: 30.34 in. Hg; rising steadily
Visibility: 1/16 mile
6-hr Max temp: 58F
6-hr Min temp: 57F
24-hr Precip: 0.11 ins.
BHO SA 1155 X W2 1/16R-F 273/58/58/0508/034/ PCPN VRY LGT/ 8////
52003 70011 10058 20057

10 A.M.
Weather: Fog (Sky Obscured, Vertical Visibility 300 ft)
Temperature: 62F; Dew Point: 62F; Relative Humidity: 100%
Wind: NE @ 10 kts
Sea-level pressure: 30.32 in Hg; rising, then falling
Visibility: 1/8 mile
3-hr Precip: Trace
BHO SA 1455 X W3 1/8F 267/62/62/0510/032/ 8//// 58006 6000/

1 P.M.
Weather: Fog (Sky Obscured, Vertical Visibility 300 ft)
Temperature: 63F, Dew point: 63F; Relative Humidity: 100%
Wind: ENE @ 3 kts (wind light)
Sea-level pressure: 30.31 in Hg; rising, then falling
Visibility: 1/4 mile
6-hr Max temp: 63F
6-hr Min temp: 58F
6-hr Precip: Trace
BHO SA 1755 X W3 1/4F 265/63/63/0603/031/ WND LGT/ 8////
58002 6000/ 10063 20058

SUMMARY FOR THURSDAY, JUNE 24, 2021

TEMPERATURE (DEGREES F)
MAX…….76     NORMAL…..78
MIN…….58     NORMAL…..60
MEAN……67     NORMAL…..69

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-2
TOTAL DEPARTURE FOR THE MONTH………………+100 [+4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE…….-1
TOTAL HEATING UNITS FOR THE MONTH……………18  DEPARTURE……-51
TOTAL HEATING UNITS FOR THE SEASON…………5596  DEPARTURE…..-775
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852  DEPARTURE…..-256

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 2  DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE MONTH…………..125  DEPARTURE……+52
TOTAL COOLING UNITS FOR THE SEASON………….154  DEPARTURE……+57
TOTAL COOLING UNITS LAST SEASON TO DATE……..148  DEPARTURE…….+6

PEAK WIND GUST (MPH):
                     420C/Official…………..25 SE  @  3:09 P.M.
                     AEROVANE (south tower)…..24 SE  @  3:09 P.M.
                     ASOS…………………..23 ESE @  3:38 P.M.
                     VECTOR #1………………25     @  2:14 P.M.
                     VECTOR #2 (south tower)….26     @  3:08 P.M.
                     DAVIS #1……………….23 SSE @  2:15 P.M.
                     DAVIS #2 (south tower)…..26 SSE @  3:21 P.M.
                     RMY……………………25     @  3:08 P.M.
                     MERLIN…………………23

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 ESE @  3:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 ESE @  3:38 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @  3:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 ESE @  3:48 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 ESE @  2:57 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..16 SSE @  3:45 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…… 8.0 SE [192 total miles]                     ASOS………………… 7.8
                     VECTOR #1……………. 8.4
                     DAVIS #1…………….. 8.3 SE
                     DAVIS #2…………….. 8.3 SE
                     RMY…………………. 8.0 SSE

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.11 DEPARTURE…..-0.01
                             ASOS………….0.10
TOTAL PRECIPITATION FOR THE MONTH………….2.18  DEPARTURE….-1.44
                             ASOS………….2.06
TOTAL PRECIPITATION FOR THE YEAR………….22.84  DEPARTURE….-3.44
                              ASOS………..22.92

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

06/01   74/50/62/0/0.00/425/47            20 WSW  AERO 24 WSW  RMY 22
06/02   80/55/68/+6/0.00/553/61           28 S    AERO 25 S    RMY 28
06/03   73/56/65/+3/0.01/073/08           29 SSW  AERO 29 SSW  RMY 29
06/04   77/61/69/+6/0.02/054/06           23 SW   AERO 25 WSW  RMY 25 TSTM
06/05   87/60/74/+11/0.00/801/88          32 SSW  AERO 37 SSW  RMY 35
06/06   91/69/80/+17/0.00/819/90          30 WSW  AERO 31 WSW  RMY 32
06/07   92/69/81/+17/0.00/838/92          31 SSW  AERO 35 SSW  RMY 34
06/08   92/69/81/+17/0.06/456/50          24 WSW  AERO 25 WSW  RMY 27 TSTM
06/09   88/70/79/+15/0.02/530/58          21 N    AERO 23 NNW  RMY 23
06/10   70/53/62/-3/0.00/795/87           28 NE   AERO 28 NE   RMY 28
06/11   70/51/61/-4/0.13/411/45           21 SSE  AERO 22 SSE  RMY 22
06/12   72/53/63/-2/0.43/430/47           20 WSW  AERO 18 WSW  RMY 20
06/13   82/56/69/+4/0.00/860/94           26 SSW  AERO 29 SSW  RMY 29
06/14   65/56/61/-5/0.63/027/03           28 S    AERO 30 SSE  RMY 29
06/15   77/61/69/+3/T/357/39              18 NE   AERO 20 NE   RMY 18 TSTM
06/16   73/56/65/-1/0.00/769/84           27 NNW  AERO 31 NNW  RMY 27
06/17   77/52/65/-2/0.00/880/96           21 WNW  AERO 21 NW   RMY 23
06/18   82/56/69/+2/T/789/86              26 WSW  AERO 28 WSW  RMY 30
06/19   86/63/75/+8/0.09/504/55           30 SW   AERO 32 SW   RMY 32
06/20   85/63/74/+6/0.00/816/89           24 S    AERO 25 SSW  RMY 25
06/21   83/65/74/+6/0.00/…/..           37 SSW  AERO 39 SSW  RMY 39
06/22   84/58/71/+3/0.68/…/..           30 NW   AERO 31 NW   RMY 31 TSTM
06/23   73/52/63/-5/0.00/…/..           25 NW   AERO 24 NW   RMY 26
06/24   76/58/67/-2/0.00/…/..           25 SE   AERO 24 SE   RMY 25

06/25 The low since midnight is 57F, the daily normal low is 60F

RECORDS FOR THE MONTH:

High minimum on the 7th of 69F, beating the old record of
66F set in 1922 and 1953.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR JUNE 25
HIGH 93F IN 1943, 1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

RECORDS FOR JUNE 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.22 INS IN 1938
PEAK GUST 48 MPH N IN 1998

TODAY’S REPORT PREPARED BY: Andrew Swanson

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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