Tuesday, June 22, 2021

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

TUESDAY, JUNE 22, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0408E
SUNSET:  1925E

ANOTHER WARM AND HUMID DAY; SHOWERS AND THUNDERSTORMS
DEVELOPING IN THE AFTERNOON…

Today featured early morning clouds and fog, giving way
to some sunshine by mid morning. A mix of sun and clouds
was the theme until early to mid afternoon when clouds
grew into towering cumulus and then cumulonimbus. A light
rain shower passed over the summit between 12-1pm, with
heavier thunderstorms seen to the east through south.

By the 1 P.M. observation lightning could be observed to
the distant south. Thunder was finally heard after the
official observation with heavier rain showers arriving
by around 2 P.M.

Humidity levels were sticky into the early afternoon with
the dew point hovering near 70F, however it began to drop
off into the mid 60s early this afternoon with a wind
shift to the northwest.

The wind had been generally on the light side through the
morning hours, finally picking up early this afternoon
with the shift in direction.

The high so far today is 84F, which is 7 degrees above
the normal high of 77F. The low since midnight is 67F,
which is 8 degrees above the daily normal low of 59F.

Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, broken altocumulus,
thin broken cirrus
Temperature: 71F; Dew Point: 68F; Relative Humidity: 91%
Wind: SW @ 8 kts
Sea-level pressure: 29.67 in. Hg; rising, then more slowly
Visibility: 15 miles, thin fog
6-hr Max temp: 71F
6-hr Min temp: 67F
24-hr Precip: 0.00 ins.
BHO SA 1155 3 SCT E130 BKN 250 -BKN 15 048/71/68/2208/967/
THN F ALQDS/ 8/631 51017 10071 20067

10 A.M.
Weather: Broken stratocumulus, broken cumulus,
broken altocumulus, overcast cirrus, few breaks in overcast
all quadrants
Temperature: 80F; Dew Point: 68F; Relative Humidity: 68%
Wind: W @ 5 kts, wind light
Sea-level pressure: 29.68 in Hg; rising then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E30 BKN 40 BKN 140 BKN 250 OVC 30 050/80/68/2805/968/
FEW BINOVC ALQDS HAZY WND LGT/ 8/834 50002

1 P.M.
Weather: Broken stratocumulus, broken cumulus, overcast altocumulus,
cumulonimbus distant E-S moving NE
Temperature: 76F, Dew point: 65F; Relative Humidity: 69%
Wind: NW @ 12G20 kts
Sea-level pressure: 29.66 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 71F
6-hr Precip: Trace
BHO SA 1755 E30 BKN 40 BKN 90 OVC 30 043/76/65/3212G20/966/
CB DSNT E-S MVG E LTGICCG DSNT S RW-B25E40 HAZY/ 8/97/ 58007
6000/ 10084 20071

SUMMARY FOR MONDAY, JUNE 21, 2021

TEMPERATURE (DEGREES F)
MAX…….83     NORMAL…..77
MIN…….65     NORMAL…..59
MEAN……74     NORMAL…..68

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..+6
TOTAL DEPARTURE FOR THE MONTH………………+104 [+4.8 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…..-774
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852  DEPARTURE…..-258

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 9  DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE MONTH…………..117  DEPARTURE……+58
TOTAL COOLING UNITS FOR THE SEASON………….146  DEPARTURE……+63
TOTAL COOLING UNITS LAST SEASON TO DATE……..122  DEPARTURE……+24

PEAK WIND GUST (MPH):
                     420C/Official…………..37 SSW @  6:16 P.M.
                     AEROVANE (south tower)…..39 SSW @ 12:09 P.M.
                     ASOS…………………..37 SSW @  6:16 P.M.
                     VECTOR #1………………41     @  6:17 P.M.
                     VECTOR #2 (south tower)….39     @ 12:09 P.M.
                     DAVIS #1……………….36 SW  @  6:51 P.M.
                     DAVIS #2 (south tower)…..36 SSW @ 12:09 P.M.
                     RMY……………………39     @  6:14 P.M.
                     MERLIN…………………36

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 SSW @  6:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 SSW @  6:17 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27     @  6:17 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 SSW @  6:17 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 SSW @  2:25 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..27 SSW @  6:16 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…..15.3 SSW [366 total miles]                     ASOS………………..15.0
                     VECTOR #1……………14.8
                     DAVIS #1…………….13.9 SSW
                     DAVIS #2…………….15.3 SSW
                     RMY…………………14.4 SSW

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.13
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.39  DEPARTURE….-1.88
                             ASOS………….1.32
TOTAL PRECIPITATION FOR THE YEAR………….22.05  DEPARTURE….-3.88
                              ASOS………..22.18

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 The low since midnight is 67F, 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 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988

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)

TODAY’S REPORT PREPARED BY: Matt Douglas