Wednesday, June 23, 2021
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
