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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 22, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER WITH INCREASING CLOUDS AND SOME QUICK
AFTERNOON SHOWERS....

Partly cloudy skies this morning became overcast
as the day went on. Showers after noontime left
0.05 inches in the gauge by the 1 P.M. observation.
Visibility was limited by either fog or haze, with 
a maximum visibility of 40 miles being seen at 7 A.M.
Temperatures have dropped from 80F at 10 A.M. to 
69F at noon. The high so far today is 81F, which 
is the same as the average daily maximum. The low 
since midnight is 69F, 6 degrees above the daily 
normal minimum of 63F.    

The minimum temperature on the 20th of 75F broke the
previous record high minimum temperature for the date
of 73F set in 1977 and 2015. The minimum temperature 
on the 21st of 76F broke the previous record high 
minimum temperature for the date of 75F set in 1991.
The high temperatures on 20th and 21st of 93F and 92F
were well below the record highs for those dates of
99F and 100F. 

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrocumulus
Temperature: 77F; Dew Point: 65F; Wind: N at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.88 ins. Hg, rising steadily
Visibility: 40 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 71F
24-hr Precip: 0.00 ins.
BHO SA 1155 110 SCT 250 SCT 40 119/77/65/0103/988/ HAZY 
WND L/V/ 8/079 53015 10077 20071 

10 A.M.
Weather: Scattered altocumulus, broken cirrocumulus
Temperature: 80F; Dew Point: 65F; Wind: ENE at 7 kts
Sea-level pressure: 29.88 ins. Hg, steady
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 110 SCT E250 BKN 30 119/80/65/0607/988/ HAZY/ 
8/079 50000  

1 P.M.
Weather: Overcast nimbostratus, few stratus fractus,
rain showers from 12:20-12:20, 12:25-12:35 P.M.
Temperature: 70F; Dew Point: 69F; Wind: ENE at 11G20 kts
Sea-level pressure: 29.87 ins. Hg, falling steadily
Visibility: 20 miles, distant fog
6-hr Max temp: 81F
6-hr Min temp: 69F
6-hr Precip: 0.05 ins. 
BHO SA 1755 E75 BKN 20R 116/70/69/0611G20/987/ FEW STFA 
DSNT FG ALQDS RWB15E20B25E35/ 8/72/ 6005/ 58003 10081 
20069  

SUMMARY FOR SUNDAY, JULY 21, 2019 

TEMPERATURE (DEGREES F)
MAX.....92   NORMAL.....81
MIN.....76   NORMAL.....63
MEAN....84   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.....................+12
TOTAL DEPARTURE FOR THE MONTH.....................+91 [+4.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............19   DEPARTURE........+11
TOTAL COOLING UNITS FOR THE MONTH.............229   DEPARTURE........+84
TOTAL COOLING UNITS FOR THE SEASON............318   DEPARTURE........+44
TOTAL COOLING UNITS LAST SEASON TO DATE.......346   DEPARTURE........-28

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................31 W   AT  4:15 P.M. 
                   AERO.........................35 W   AT  1:46 P.M.  
                   ASOS.........................32 W   AT  4:17 P.M.
                   DAVIS........................34 W   AT  4:16 P.M.  RMY 31
FASTEST MILE FOR YESTERDAY......................24 W   AT  4:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................23 W   AT  4:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 W   AT  1:50 P.M.
AVERAGE WIND SPEED AND DIRECTION................13.3 W
                   ASOS.........................13.4
                   DAVIS........................13.8 W [270 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..........2.81  DEPARTURE......+0.21
                         ASOS..............2.82
TOTAL PRECIPITATION FOR THE YEAR..........32.68  DEPARTURE......+3.11
                         ASOS.............32.50

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 83/58/71/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/.../..               44 W   AERO M  M   RMY 47 
07/18 72/61/67/-5/0.04/.../..               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/.../..               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/.../..              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/.../..              31 W   AERO 35 W   RMY 31

07/22 Low temp since midnight is 71F; normal low is 63F

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
         BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
         BREAKS PREVIOUS RECORD OF 75F SET IN 1991

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

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INS IN 1900 
PEAK GUST 55 MPH IN 1983

RECORDS FOR JULY 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

TODAY'S REPORT PREPARED BY: Benjamin Turner