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

FRIDAY, AUGUST 13, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0450E
SUNSET:  1848E

HEAT AND HUMIDITY ROLL ON...

Not a whole lot has changed since yesterday. We are finding
ourselves yet again very hot and very humid with dew points
hanging in the low to mid 70's. A Heat Advisory remains in
effect for the majority of central and southern New England.
Today will likely mark a heat wave for many of those locations.
A heat wave by definition is 3 days of a 90F or greater reading.
Here atop the summit, we will likely fall short of achieving
that criteria...will come down to how tomorrow pans out.

Visibility has been poor due to considerable water vapor in the
air. A measly 30 miles is the average for the day. There also
continues to be an air quality alert for the area!

The wind has been mostly on the gentle side, even going calm
for a short period mid-morning. Flow is generally from the
SSW helping to maintain a steady supply of tropical air!

The high so far today is 91F, 10 degrees above the daily normal
maximum of 81F. The low so far today is 73F, which is 10 degrees
above the daily normal minimum of 63F.

-----------------------------------------------

PRELIMINARY STATS FOR JULY 2021

TEMPERATURE, Deg. F
Avg. Max. 76.3 [-5.4]
Avg. Min. 60.4 [-2.5]
Mean      68.8 [-3.9]
24-hour corrected mean: 67.9
Max. for month: 90F on the 16th
Min. for month: 52F on the 31st

HEATING DEGREE DAYS
Total heating units:     28 [+21]
Total for the season:    28 [+21]
Total for last season:    1

COOLING DEGREE DAYS
Total cooling units:     153 [-95]
Total for the season:    379 [-8]
Total for last season:   487

PRECIPITATION, Inches
Total: 11.59 [+8.12]
Greatest in 24 hrs: 3.09 on the 9-10th

WIND, mph
Avg. uncorrected wind speed:  9.0 mph
Avg. corrected wind speed:    9.7 mph
Prevailing wind direction:   NE [14%]
Peak gust and direction:     63 NW on the 7th

SUNSHINE:
Campbell-Stokes card minutes: 11574 minutes of a possible 26682 or 43%
Astronomical total minutes: 12005 minutes of a possible 27732 or 43%


-----------------------------------------------

Today's Observations:

7 A.M.
Weather: Clear (few altocumulus E, WSW and NW)
Temperature: 78F; Dew Point: 72F; Relative Humidity: 82%
Wind: NW @ 7 kts
Sea-level pressure: 30.03 in. Hg; Rising, then rising more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 73F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 20 170/78/72/3107/003/ FEW AC DSNT E
AND DSNT WSW AND DSNT NW HAZY/ 8/050 53010 10078 20073

10 A.M.
Weather: Scattered altocumulus (few cirrus)
Temperature: 86F; Dew Point: 73F; Relative Humidity: 67%
Wind: NNW @ 2 kts (wind light & variable)
Sea-level pressure: 30.06 in Hg; rising unsteadily
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 150 SCT 20 178/86/73/3402/006/ FEW CI ALQDS HAZY
WND L/V/ 8/050 52008

1 P.M.
Weather: Scattered Cumulus, Scattered Altocumulus, (thin) Broken
Cirrus
Temperature: 90F, Dew point: 73F; Relative Humidity: 58%
Wind: SSW @ 8G14
Sea-level pressure: 30.03 in Hg; falling unsteadily
Visibility: 30 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 78F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 200 SCT 250 -BKN 30 168/90/73/2008G14/003/
HAZY/ 8/151 57010 10091 20078


SUMMARY FOR THURSDAY, AUGUST 12, 2021

TEMPERATURE (DEGREES F)
MAX.......91     NORMAL.....81
MIN.......71     NORMAL.....63
MEAN......81     NORMAL.....72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL...........+9
TOTAL DEPARTURE FOR THE MONTH.......................-5 [-0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY................0  DEPARTURE.........0
TOTAL HEATING UNITS FOR THE MONTH................0  DEPARTURE........-2
TOTAL HEATING UNITS FOR THE SEASON..............28  DEPARTURE.......+19
TOTAL HEATING UNITS LAST SEASON TO DATE..........1  DEPARTURE.......+27

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY...............16  DEPARTURE........+9
TOTAL COOLING UNITS FOR THE MONTH...............86  DEPARTURE........-6
TOTAL COOLING UNITS FOR THE SEASON.............465  DEPARTURE.......-14
TOTAL COOLING UNITS LAST SEASON TO DATE........647  DEPARTURE......-182

PEAK WIND GUST (MPH):
                     Official...................36 WSW @  6:40 P.M.
                     AEROVANE (south tower).....37 WSW @  6:49 P.M.
                     VECTOR #2 (south tower)....40     @  6:40 P.M.
                     DAVIS #2 (south tower).....35 WSW @  6:40 P.M.
                     ASOS...........OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1......OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS
                     RMY............OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN.........OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................24 WSW @  6:49 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............26     @  6:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............26 WSW @  6:49 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE........OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL......10.6 WSW [255 total miles]
                     VECTOR #2................11.3
                     DAVIS #2.................11.1 WSW
                     RMY.................OUT OF SERVICE D/T RENOVATIONS
                     ASOS................OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1............OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00  DEPARTURE....-0.12
TOTAL PRECIPITATION FOR THE MONTH.............2.76  DEPARTURE....+1.18
TOTAL PRECIPITATION FOR THE YEAR.............37.73  DEPARTURE....+5.71


PRELIMINARY CLIMATE SUMMARY FOR JULY 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


07/01   80/65/73/+2/0.74/155/17           22 W   AERO 20 WSW  RMY 21
07/02   65/55/60/-11/1.49/000/00          37 NE  AERO 36 NE   RMY 39
07/03   56/54/55/-17/1.98/000/00          41 NE  AERO 44 NE   RMY 45 TSTM
07/04   66/54/60/-12/0.16/191/21          26 ENE AERO 23 ENE  RMY 26
07/05   74/53/64/-8/0.01/546/60           26 SSW AERO 28 SSW  RMY 27
07/06   87/66/77/+5/0.26/255/28           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/699/77           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/109/12           46 W   AERO 46 W    RMY 51 TSTM
07/09   73/62/68/-5/3.02/163/18           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/109/12           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/325/36              21 SW  AERO 19 S    RMY N/A
07/12   67/61/64/-9/1.01/000/00           31 ENE AERO 31 ENE  RMY N/A
07/13   66/60/63/-10/0.02/000/00          19 E   AERO 18 E    RMY N/A
07/14   80/62/71/-2/0.01/216/24           19 S   AERO 18 S    RMY N/A
07/15   88/67/78/+5/0.00/844/94           19 WSW AERO 18 SSW  RMY N/A
07/16   90/70/80/+7/0.04/609/68           36 NNW AERO 39 NNW  RMY N/A TSTM
07/17   78/64/71/-2/0.34/394/44           26 ENE AERO 25 ENE  RMY N/A TSTM
07/18   74/63/69/-4/0.15/000/00           22 NE  AERO 22 NE   RMY N/A TSTM
07/19   71/63/67/-6/0.07/027/03           17 ENE AERO 17 ENE  RMY N/A
07/20   83/64/74/+1/0.00/730/82           23 NW  AERO 23 NW   RMY N/A
07/21   79/62/71/-2/0.16/577/65           26 NNW AERO 23 NNW  RMY N/A TSTM
07/22   79/58/69/-4/T/656/74              20 WNW AERO 20 WNW  RMY N/A
07/23   79/62/71/-2/0.00/708/80           22 S   AERO 21 S    RMY N/A TSTM
07/24   78/59/69/-4/0.00/830/94           19 S   AERO 18 S    RMY N/A
07/25   71/64/68/-5/0.08/009/01           40 SSW AERO 41 SSW  RMY N/A
07/26   87/67/77/+4/0.01/765/87           27 WSW AERO 25 WNW  RMY N/A
07/27   87/65/76/+3/0.56/754/86           55 NW  AERO 58 NW   RMY N/A TSTM
07/28   72/61/67/-6/0.06/446/51           18 NNE AERO 18 NNE  RMY N/A
07/29   77/61/69/-4/0.19/323/37           39 S   AERO 40 S    RMY N/A
07/30   78/58/68/-5/0.01/714/82           31 NW  AERO 31 NW   RMY N/A
07/31   74/52/63/-10/0.00/851/98          24 WNW AERO 25 WNW  RMY N/A

RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49",
        Surpasses previous record of 1.42" set in 1986

JULY 3: Record daily precipitation of 1.98",
        Surpasses previous record of 1.36" set in 1985

JULY 7: Record peak gust of 63 MPH,
        Surpasses previous record of 55 MPH set in 1989

JULY 2021: New record for number of days with measurable precipitation
           with 24 days. Beating the previous record of 20 in 1906
           This is also the record for ANY month, beating the previous
           record of 22 in December 1972


PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

08/01   77/58/68/-5/T/.../..             23 SSW AERO 24 SSW RMY N/A
08/02   78/61/70/-3/T/.../..             28 WNW AERO 28 WNW RMY N/A
08/03   76/60/68/-5/0.00/.../..          15 N   AERO 16 N   RMY N/A
08/04   75/61/68/-5/0.71/.../..          21 ESE AERO 21 ESE RMY N/A
08/05   68/61/65/-8/1.68/.../..          28 NE  AERO 28 NE  RMY N/A
08/06   85/62/74/+1/0.00/.../..          19 S   AERO 20 WSW RMY N/A
08/07   88/66/77/+4/0.00/.../..          23 SW  AERO 23 SW  RMY N/A
08/08   80/67/74/+2/T/.../..             16 SW  AERO 16 WNW RMY N/A
08/09   75/64/70/-2/0.25/.../..          22 ENE AERO 21 NE  RMY N/A
08/10   78/63/71/-1/..../.../..          19 S   AERO 20 S   RMY N/A
08/11   89/70/80/+8/..../.../..          29 SSW AERO 28 SSW RMY N/A
08/12   91/71/81/+9/..../.../..          36 WSW AERO 37 WSW RMY N/A

08/13   The low since midnight is 73F, the daily normal low is 63F


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

RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963

RECORDS FOR AUGUST 14
HIGH 99F IN 2002
LOW 46F IN 1964
PRECIP 3.06 INCHES IN 1919
PEAK GUST 61 MPH WNW IN 1963

TODAY'S REPORT PREPARED BY: Andrew Swanson