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

MONDAY, JULY 13, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND HUMID AIR CONTINUES; THUNDERSTORMS IN THE AREA...

We remain in a warm and humid air mass today 
with dew points rising from the mid 60s this 
morning to the low 70s this afternoon. The 
temperature did make it to the low 80s before
a thunderstorm moved through around noon time,
knocking the mercury back briefly into the upper
60s. The temperature has since recovered back
into the upper 70s early this afternoon.

The thunderstorm brought 0.23" of rainfall.

Wind has been quite light all day except during 
the thunderstorm when we had a gust to 30 mph.

The high so far today is 82 degrees, this is 
1 degree above the daily normal high of 81F. 
The low since midnight is 69F, which is 6 
degrees above the daily normal low of 63F.


PRELIMINARY STATS FOR JUNE 2020

TEMPERATURE, Deg. F
Avg. Max. 78.0 [+3.0]
Avg. Min. 59.1 [+2.0]
Mean      68.6 [+2.5]
24-hour corrected mean: 67.5
Max. for month: 90F on the 20th
Min. for month: 42F on the 1st

HEATING DEGREE DAYS
Total heating units:     40 [-33]
Total for the season:  5852 [-402]
Total for last season: 6254

COOLING DEGREE DAYS
Total cooling units:    152  [+47]
Total for the season:   184  [+55]
Total for last season:  89

PRECIPITATION, Inches
Total: 7.56 [+3.25]
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 [15%]
Peak gust and direction:     55 SW on the 6th

SUNSHINE:
Campbell-Stokes card minutes: 15996 minutes of a possible 26376 or 61%
Astronomical total minutes: 16650 minutes of a possible 27422 or 61%


Today's Observations:

7 A.M.
Weather: Broken Altocumulus/Altocumulus Castellanus,
Overcast Altocumulus
Temperature: 72F; Dew Point: 64F; Relative Humidity: 76%
Wind: WSW at 9 kts
Sea-level pressure: 29.79 ins. Hg: rising, then steady
Visibility: 60 miles
6-hr Max temp: 72F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.
BHO SA 1155 E100 BKN 130 OVC 60 088/72/64/2509/979/
VIRGA DSNT SSW-NNW/ 8/08/ 51010 10072 20070

10 A.M.
Weather: Broken Altocumulus, broken altocumulus castellanus,
broken cirrus
Temperature: 76F; Dew Point: 67F; Relative Humidity: 74%
Wind: S at 2 kts, wind light
Sea-level pressure: 29.80 ins. Hg: rising, then steady
Visibility: 35 miles, hazy
3-hr Precip: Trace
BHO SA 1455 E70 BKN 100 BKN 180 BKN 35 090/76/67/1802/980/
FEW CU DSNT S-SSW FEW MDT CU AND TCU DSNT SW-NNW HAZY
WND LGT RWE1359/ 8/282 51002 6000/

1 P.M.
Weather: Broken cumulonimbus, broken altocumulus, broken
cirrus
Temperature: 74F; Dew Point: 72F; Relative Humidity: 94%
Wind: S at 10 kts, peak wind SSE 26 kts at 12:21 P.M. 
Sea-level pressure: 29.77 ins. Hg: falling, then more rapidly
Visibility: 30 miles, 6 miles NW-N
6-hr Max temp: 82F
6-hr Min temp: 69F
6-hr Precip: 0.23 ins.
BHO SA 1755 E70 BKN 110 BKN 250 BKN 30T 082/74/72/1710/977/
TRW NW-NNE MVG NE VSBY 6 NW-N HAZY PK WND 1626/21/ TE30B45
RWE01B12E32B37E48 LTGICCC/ 8/391 58008 6023 10082 20069  


SUMMARY FOR SUNDAY, JULY 12, 2020 

TEMPERATURE (DEGREES F)
MAX.....86   NORMAL.....81
MIN.....70   NORMAL.....63
MEAN....78   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL................. +6
TOTAL DEPARTURE FOR THE MONTH................. +22 [+1.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY.................13  DEPARTURE....... +6
TOTAL COOLING UNITS FOR THE MONTH.................97  DEPARTURE.......+19
TOTAL COOLING UNITS FOR THE SEASON...............281  DEPARTURE.......+74
TOTAL COOLING UNITS LAST SEASON TO DATE..........211  DEPARTURE.......+70

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................28 WSW AT 12:08 P.M.  
                   AERO.........................28 WSW AT 12:39 P.M.  
                   ASOS.........................29 WSW AT 12:09 P.M. 
                   DAVIS........................29 WSW AT 12:08 P.M RMY 29
FASTEST MILE FOR YESTERDAY......................21 WSW AT 10:37 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................21 W   AT 11:03 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................23 W   AT 11:03 A.M.
AVERAGE WIND SPEED AND DIRECTION..............13.4 SW            
                   ASOS.......................12.8
                   DAVIS......................13.0 SW [229 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.60  DEPARTURE......-0.79
                         ASOS..............0.60
TOTAL PRECIPITATION FOR THE YEAR..........27.95  DEPARTURE......-0.41
                         ASOS.............28.61


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  64/42/53/-9/T/0.0/724/80            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/..../0.0/689/76         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/400/44            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/..../0.0/673/74        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/..../0.0/300/33        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/..../0.0/301/33         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/255/28         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/866/95          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/0.0/110/12            23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/658/72            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/165/18         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/0.0/705/77         26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/0.0/669/73         21 WNW  AERO 20 WNW RMY N/A            
06/14  67/49/58/-8/0.00/0.0/852/93         21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/0.0/696/76          21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/0.0/889/97         18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/0.0/889/97         20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/0.0/715/78         22 S    AERO 22 SSW RMY 22
06/19  86/66/76/+9/0.00/0.0/789/86         22 S    AERO 22 S   RMY 21
06/20  90/65/78/+10/0.00/0.0/834/91        22 S    AERO 21 S   RMY 21
06/21  90/66/78/+10/0.83/0.0/514/56        33 ESE  AERO 35 ESE RMY 33  TSTM
06/22  77/65/71/+3/0.00/0.0/761/83         15 E    AERO 17 S   RMY 14
06/23  85/65/75/+7/0.00/0.0/431/47         27 S    AERO 24 S   RMY 26
06/24  84/66/75/+6/0.00/0.0/348/38         25 S    AERO 24 S   RMY 25
06/25  84/63/74/+5/0.00/0.0/806/88         29 W    AERO 29 W   RMY 29
06/26  83/65/74/+5/0.02/0.0/769/84         25 S    AERO 25 S   RMY 27
06/27  82/65/74/+5/0.05/0.0/330/36         21 S    AERO 20 S   RMY 20
06/28  84/62/73/+3/3.27/0.0/421/46         35 W    AERO 33 N   RMY 37  TSTM
06/29  71/61/66/-4/..../0.0/064/07         18 NE   AERO 18 NE  RMY 18  TSTM
06/30  68/62/65/-5/..../.../027/03         14 ENE  AERO 14 ENE RMY 13 

Record rainfall on the 28th of 3.27". Old record 2.09" in 1938

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/.../.../..          16 E    AERO 14 E   RMY 14  TSTM
07/02  86/61/74/4/0.00/.../.../..          30 WSW  AERO 25 WSW RMY 33
07/03  73/60/67/-4/0.00/.../.../..         30 NE   AERO 28 NE  RMY 30
07/04  79/60/70/-1/0.00/.../..             16 S    AERO 16 S   RMY 16
07/05  83/63/73/+2/0.54/.../..             24 NW   AERO 30 NW  RMY 26  TSTM
07/06  73/60/67/-4/0.00/.../..             20 ENE  AERO 16 NNE RMY 18
07/07  78/60/69/-2/0.00/.../..             25 S    AERO 25 S   RMY 26
07/08  83/64/74/+2/0.00/.../..             32 SSW  AERO 32 SSW RMY 32
07/09  89/70/80/+8/0.00/.../.              24 S    AERO 23 S   RMY 22 
07/10  83/70/77/+5/0.05/.../..             30 SSE  AERO 32 SSE RMY N/A
07/11  85/70/78/+6/0.00/.../..             39 S    AERO 39 S   RMY 38
07/12  86/70/78/+6/0.00/.../..             28 WSW  AERO 28 WSW RMY 29

07/13 The low since midnight is 69F, 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 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [THUNDERSTORM GUST; RECORD FOR MONTH]

TODAY'S REPORT PREPARED BY: Matt Douglas