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

THURSDAY, JULY 30, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HEAT WAVE ATOP OF THE GREAT BLUE HILL…

Yesterday the high reached 90 degrees 
making it the 3rd consecutive day of 
a high temperature above 90 degrees. 
Today’s high so far is 88 degrees 
which is 2 degrees short of continuing 
the heat wave. Dew point temperatures 
stayed in the high 60s throughout the day. 
In the afternoon scattered cumulus 
clouds began to show signs of convection. 
The high so far today is 88 degrees. This 
is 7 degrees above the daily normal high 
of 81F. The low since midnight is 71F, 
which is 8 degrees above the daily normal 
low of 63F


Today's Observations:

7 A.M.
Weather: Broken Altocumulus
Temperature: 74F; Dew Point: 68F; Relative Humidity: 83%
Wind: WSW at 5 kts
Sea-level pressure: 29.89 ins. Hg: rising, then steady
Visibility: 65 miles
6-hr Max temp: 74F
6-hr Min temp: 71F
24-hr Precip: 0.01 ins.
BHO SA 1155 140 BKN 65 122/74/68/2405/989/ 8/050 51005 
10074 20071

10 A.M.
Weather: Few cumulus, Scattered Cirrus
Temperature: 84F; Dew Point: 65F; Relative Humidity: 53%
Wind: SW at 9 kts
Sea-level pressure: 29.87 ins. Hg: falling, then more slowly
Visibility: 60 miles, HAZY
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 60 117/84/65/2209/987/ FEW CU ALQDS HAZY/ 
8/102 56005

1 P.M.
Weather: Scattered Cumulus, Scattered Altocumulus, 
Broken Cirrostratus
Temperature: 88F; Dew Point: 65F; Relative Humidity: 53%
Wind: SW at 11G23 kts
Sea-level pressure: 29.83 ins. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 88F
6-hr Min temp: 74F
6-hr Precip: 0.00 ins.
BHO SA 1755 55 SCT 110 SCT 250 BKN 60 103/88/65/2311G23/983/ HAZY/ 
8/256 58014 10088 20074


SUMMARY FOR WEDNESDAY, JULY 29, 2020 

TEMPERATURE (DEGREES F)
MAX.....90   NORMAL.....81
MIN.....68   NORMAL.....63
MEAN....79   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL..................+7
TOTAL DEPARTURE FOR THE MONTH.................+91 [+2.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY.................14  DEPARTURE.......-6
TOTAL COOLING UNITS FOR THE MONTH................276  DEPARTURE.......+68
TOTAL COOLING UNITS FOR THE SEASON...............460  DEPARTURE......+123
TOTAL COOLING UNITS LAST SEASON TO DATE..........380  DEPARTURE.......+80

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................23  SSW AT 3:33 P.M.  
                   AERO.........................25  SSW AT 3:35 P.M. 
                   ASOS.........................24  S   AT 3:40 P.M.
                   DAVIS........................23  SW  AT 1:33 P.M
                   RMY 24  MERLIN 22
FASTEST MILE FOR YESTERDAY......................17  SSW AT 3:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................17  S   AT 3:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................16  S   AT 3:39 P.M.
AVERAGE WIND SPEED AND DIRECTION...............9.2 WSW            
                   ASOS........................10.1
                   DAVIS.......................9.2 WSW [240 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.72  DEPARTURE......-1.99
                         ASOS..............1.80
TOTAL PRECIPITATION FOR THE YEAR..........29.07  DEPARTURE......-1.61
                         ASOS.............29.81

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/.../..             28 S    AERO 28 S    RMY 26
07/20  91/72/82/+10/T/.../..               25 SSW  AERO 25 SSW  RMY N/A
07/21  88/68/78/+6/0.00/.../..             25 W    AERO 25 W    RMY 24
07/22  80/67/74/+2/..../.../..             16 ENE  AERO M  M    RMY 16
07/23  88/68/78/+6/0.48/.../..             31 N    AERO 32 N    RMY 31  TSTM
07/24  81/68/75/+3/0.00/.../..             15 ENE  AERO 15 ENE  RMY 16
07/25  88/67/78/+6/0.00/.../..             18 W    AERO 18 WNW  RMY N/A
07/26  89/70/80/+8/0.00/.../..             27 W    AERO 28 W    RMY 27
07/27  94/72/83/+11/0.00/.../..            23 SW   AERO 25 SW   RMY N/A
07/28  95/74/85/+13/0.01/.../..            28 WSW  AERO 25 WSW  RMY 25
07/29  90/68/79/7/0/0.00/.../..            23 SSW  AERO 25 SSW  RMY 24

07/30  The low since midnight is 71F, 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 JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971

TODAY'S REPORT PREPARED BY: Nicholas Rousseau