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Wednesday, August 12, 2020

August 12, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, AUGUST 12, 2020 ALL TIMES ARE…

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

WEDNESDAY, AUGUST 12, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

DAY FOUR OF HEAT WAVE ON TOP OF GREAT BLUE HILL….

Today was another abnormally hot day on top of Great Blue,
making day four of our heat wave. The high temperature so far
was 92F right around the 1 o’clock EST observation, matching
yesterday’s high temperature. Visibility today was better than
it has been with Monadnock visible after the 10 o’clock EST
observation. Humidity has been dropping through the day which
corresponded with a decrease in haze in all directions. After
1 o’clock, cumulus clouds have been gaining height, improving
chances for a shower or storm later on today. Cloud cover has
also increased as the day progressed.

PRELIMINARY STATS FOR JULY 2020

TEMPERATURE, Deg. F
Avg. Max. 83.5 [+2.7] Avg. Min. 66.0 [+3.1] Mean      74.8 [+2.9] 24-hour corrected mean: 73.6
Max. for month: 95F on the 28th
Min. for month: 57F on the 16th

COOLING DEGREE DAYS
Total cooling units:    303  [+81] Total for the season:   487  [+136] Total for last season:  411

PRECIPITATION, Inches
Total: 1.72 [-2.30] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction:   S [12%] Peak gust and direction:     39 S on the 11th

SUNSHINE:
Campbell-Stokes card minutes: 15300 minutes of a possible 26682 or 57%
Astronomical total minutes: 15879 minutes of a possible 27720 or 57%

Today’s Observations:

7 A.M.
Weather: Few cumulus S-SE, scattered altocumulus, scattered
cirrostratus
Temperature: 76F; Dew Point: 70F; Relative Humidity: 82%
Wind: SW at 7 kts
Sea-level pressure: 30.01 ins. Hg: Falling then steady
Visibility: 30 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 74F
24-hr Precip: 0.00 ins.
BHO SA 1155 140 SCT 300 SCT 30 164/76/70/2607/001/ FEW CU S-SE
HAZY/ 8/136 53015 10076 20074

10 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 86F; Dew Point: 65F; Relative Humidity: 73%
Wind: W at 6 kts
Sea-level pressure: 30.01 ins. Hg: Rising then falling
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 150 SCT 250 SCT 70 164/86/65/2606/001/ FEW
CU ALQDS/ 8/136 50000

1 P.M.
Weather: Broken stratocumulus, broken altocumulus, broken
cirrostratus
Temperature: 92F; Dew Point: 71F; Relative Humidity: 51%
Wind: WNW at 8 kts
Sea-level pressure: 30.01 ins. Hg: Falling, then steady
Visibility: 70 miles
6-hr Max temp: 92F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 90 BKN 150 BKN 250 BKN 70 162/92/71/2908/001/ 8/435
56002 10092 20076

SUMMARY FOR TUESDAY, AUGUST 11, 2020

TEMPERATURE (DEGREES F)
MAX…..92   NORMAL…..80
MIN…..72   NORMAL…..63
MEAN….82   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………..+11
TOTAL DEPARTURE FOR THE MONTH……………..+66 [+5.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..17  DEPARTURE……+10
TOTAL COOLING UNITS FOR THE MONTH…………….141  DEPARTURE……+63
TOTAL COOLING UNITS FOR THE SEASON……………628  DEPARTURE…..+199
TOTAL COOLING UNITS LAST SEASON TO DATE……….493  DEPARTURE…..+135

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..31 SSW AT  4:29 P.M.
AERO…………………….35 SSW AT  4:29 P.M.
ASOS…………………….33 S   AT  4:30 P.M.
DAVIS……………………33 S   AT  3:56 P.M
RMY 31  MERLIN 32
FASTEST MILE FOR YESTERDAY………………….24 SSW AT  4:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S   AT  3:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 S   AT  3:57 P.M.
AVERAGE WIND SPEED AND DIRECTION…………… 12.3 SSW
ASOS…………………… 12.1
DAVIS………………….. 11.2 SSW [204 deg.]

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……….0.23  DEPARTURE……-1.36
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….29.30  DEPARTURE……-3.28
ASOS………….30.04

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  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM
07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW  RMY 33
07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30
07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16
07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM
07/06  73/60/67/-4/0.00/482/53             20 ENE  AERO 16 NNE  RMY 18
07/07  78/60/69/-2/0.00/454/50             25 S    AERO 25 S    RMY 26
07/08  83/64/74/+2/0.00/227/25             32 SSW  AERO 32 SSW  RMY 32
07/09  89/70/80/+8/0.00/834/92             24 S    AERO 23 S    RMY 22
07/10  83/70/77/+5/0.05/109/12             30 SSE  AERO 32 SSE  RMY N/A
07/11  85/70/78/+6/0.00/614/68             39 S    AERO 39 S    RMY 38
07/12  86/70/78/+6/0.00/830/92             28 WSW  AERO 28 WSW  RMY 29
07/13  82/69/76/+4/0.23/306/34             30 SSE  AERO 31 SSE  RMY 30  TSTM
07/14  78/63/71/-1/0.00/369/41             26 ENE  AERO 25 ENE  RMY 26
07/15  72/59/66/-6/0.00/539/60             21 NE   AERO 21 NE   RMY N/A
07/16  73/57/65/-7/0.00/815/91             21 E    AERO 21 E    RMY 19
07/17  71/57/64/-8/0.19/027/03             24 SSW  AERO 24 SSW  RMY 25
07/18  89/66/78/+6/0.00/822/92             18 W    AERO 17 W    RMY 19
07/19  92/69/81/+9/0.00/722/81             28 S    AERO 28 S    RMY 26
07/20  91/72/82/+10/T/481/54               25 SSW  AERO 25 SSW  RMY N/A
07/21  88/68/78/+6/0.00/799/90             25 W    AERO 25 W    RMY 24
07/22  80/67/74/+2/…./275/31             16 ENE  AERO M  M    RMY 16
07/23  88/68/78/+6/0.48/203/23             31 N    AERO 32 N    RMY 31  TSTM
07/24  81/68/75/+3/0.00/476/54             15 ENE  AERO 15 ENE  RMY 16
07/25  88/67/78/+6/0.00/845/96             18 W    AERO 18 WNW  RMY N/A
07/26  89/70/80/+8/0.00/632/72             27 W    AERO 28 W    RMY 27
07/27  94/72/83/+11/0.00/823/94            23 SW   AERO 25 SW   RMY N/A
07/28  95/74/85/+13/0.01/621/71            28 WSW  AERO 25 WSW  RMY 25
07/29  90/68/79/+7/0.00/698/80             23 SSW  AERO 25 SSW  RMY 24
07/30  88/71/80/+8/0.00/252/29             29 W    AERO 28 W    RMY 29
07/31  84/69/77/+5/0.00/564/65             14 ENE  AERO 14 ENE  RMY 15

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  87/66/77/+5/0.00/…/..             18 S    AERO 21 S    RMY 19
08/02  85/69/77/+5/0.02/…/..             36 S    AERO 37 S    RMY 38
08/03  91/75/83/+11/0.00/…/..            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/…/..              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/…/..             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/…/..              20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/…/..                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/…/..             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/…/..             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/…/..            22 W    AERO 20 W    RMY 20
08/11  92/72/82/+11/0.00/…/..            31 SSW  AERO 35 SSW  RMY 31  TSTM

08/12  The low since midnight is 74F, the daily normal low is 62F

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

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

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

TODAY’S REPORT PREPARED BY: Samantha Richard

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Blue Hill Observatory & Science Center · Legal

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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