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Wednesday, June 23, 2021

June 23, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, JUNE 23, 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

WEDNESDAY, JUNE 23, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0409E
SUNSET:  1925E

COOL AND DRY DAY WITH EXCELLENT VISIBILITY AFTER YESTERDAY’S RAIN….

It was a pleasant day at the top of Great Blue Hill with sunshine and much cooler and drier air. Last night, the temperatures dipped to a low of 52F, which is 7F below the normal low temperature of 59F for this time of the year. So far today, the maximum temperature has reached 71F. Yesterday, 84F was the maximum temperature, which is 7F above the normal maximum of 77F. Overall, yesterday’s average temperature was 3F warmer than normal, but today is expected to continue to be cooler than normal.

Yesterday, 0.68 ins. fell as showers and thunderstorms passed through New England in the afternoon and evening. A peak gust of 30 MPH out of the northwest was observed at 1:39 P.M. EST, just before the rain began. Despite the substantial rainfall, we still have received 1.32 ins. less rain than normal so far for the month of June at the Observatory.

The air has dried out today and the visibility has increased to 80 miles. Dew points have dropped down into the mid 40Fs, and by the 1:00 P.M. observation, the relative humidity was at only 42%. A layer of broken cumulus moved in by the afternoon, but the sun has still been shining for most of this beautiful day.

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus E-SSE, few altostratus and cirrus NE-S
Temperature: 57F; Dew Point: 48F; Relative Humidity: 72%
Wind: NW @ 9 kts, gusting to 20 kts
Sea-level pressure: 30.07 in. Hg; rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 57F
6-hr Min temp: 52F
24-hr Precip: 0.68 ins.
BHO SA 1155 CLR 80 183/57/48/32G20/070/ FEW CU DSNT E-SSE FEW AS/CI NE-S/ 8/121 51035 70068 10057 20052

10 A.M.
Weather: Scattered cumulus, few altostratus and cirrus NE-SSW
Temperature: 65F; Dew Point: 47F; Relative Humidity: 64%
Wind: NNW @ 8 kts, gusting to 21 kts
Sea-level pressure: 30.12 in Hg; rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 40 SCT 201/65/45/3308G21/012/ FEW AS/CI NE-SSW/ 8/121 51018

1 P.M.
Weather: Broken cumulus, few cirrus NE-SSW
Temperature: 69F, Dew point: 45F; Relative Humidity: 42%
Wind: NW @ 7 kts, gusting to 16 kts
Sea-level pressure: 30.15 in Hg; rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 71F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 55 BKN 210/69/45/3107G16/015/ FEW CI NE-SSW/ 8/101 51010 10071 20057

SUMMARY FOR TUESDAY, JUNE 22, 2021

TEMPERATURE (DEGREES F)
MAX…….84     NORMAL…..77
MIN…….58     NORMAL…..59
MEAN……71     NORMAL…..68

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..+3
TOTAL DEPARTURE FOR THE MONTH………………+107 [+4.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE…….-1
TOTAL HEATING UNITS FOR THE MONTH……………16  DEPARTURE……-49
TOTAL HEATING UNITS FOR THE SEASON…………5594  DEPARTURE…..-775
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852  DEPARTURE…..-258

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 6  DEPARTURE…….+2
TOTAL COOLING UNITS FOR THE MONTH…………..123  DEPARTURE……+59
TOTAL COOLING UNITS FOR THE SEASON………….152  DEPARTURE……+64
TOTAL COOLING UNITS LAST SEASON TO DATE……..128  DEPARTURE……+24

PEAK WIND GUST (MPH):
                     420C/Official…………..30 NW  @ 1:39 P.M.
                     AEROVANE (south tower)…..31 NW  @ 1:37 P.M.
                     ASOS…………………..29 NW  @ 1:40 P.M.
                     VECTOR #1………………33     @ 1:38 P.M.
                     VECTOR #2 (south tower)….35     @ 1:36 P.M.
                     DAVIS #1……………….28 NW  @ 1:27 P.M.
                     DAVIS #2 (south tower)…..30 WNW @ 1:37 P.M.
                     RMY……………………31     @ 1:36 P.M.
                     MERLIN…………………30

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 NW  @  1:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NW  @  1:40 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22     @  1:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 NW  @  1:40 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NW  @  1:28 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 NNW @  1:37 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……9.0 NW [217 total miles]                     ASOS…………………9.7
                     VECTOR #1…………….9.5
                     DAVIS #1……………..9.2 W
                     DAVIS #2……………..9.4 W
                     RMY………………….9.0 W

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.68  DEPARTURE….+0.57
                             ASOS………….0.64
TOTAL PRECIPITATION FOR THE MONTH………….2.07  DEPARTURE….-1.32
                             ASOS………….1.96
TOTAL PRECIPITATION FOR THE YEAR………….22.73  DEPARTURE….-3.32
                              ASOS………..22.82

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/…/..              18 NE   AERO 20 NE   RMY 18 TSTM
06/16   73/56/65/-1/0.00/…/..           27 NNW  AERO 31 NNW  RMY 27
06/17   77/52/65/-2/0.00/…/..           21 WNW  AERO 21 NW   RMY 23
06/18   82/56/69/+2/T/…/..              26 WSW  AERO 28 WSW  RMY 30
06/19   86/63/75/+8/0.09/…/..           30 SW   AERO 32 SW   RMY 32
06/20   85/63/74/+6/0.00/…/..           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

06/23 The low since midnight is 52F, the daily normal low is 59F

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 23
HIGH 93F IN 1888
LOW 45F IN 1885
PRECIP 0.76 INS IN 1893
PEAK GUST 63 MPH SE IN 1972 (AGNES)

RECORDS FOR JUNE 24
HIGH 91F IN 1914, 1976, 2013
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010

TODAY’S REPORT PREPARED BY: Elizabeth Suzedell

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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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§ 02

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§ 03

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§ 04

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§ 05

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§ 06

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§ 08

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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