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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY MORNING WITH SHOWERS TURNING INTO 
A BEAUTIFUL SUNNY AFTERNOON…

Showers early with 0.44 inches being 
measured at the 7 A.M observation and 
another foggy morning on top of the 
Great Blue Hill. Shower and Fog continued 
through the next observation with 
an additional 0.10 inches falling in the 
3 hour period. Clouds starting to clear 
in the early afternoon causing temperature 
to begin to increase. The high so far 
today is 81F, which is the same as the 
average daily maximum of 81F. The low 
since midnight is 68F, 5 degrees above 
the daily normal minimum of 63F.  


PRELIMINARY STATS FOR JUNE 2019

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1]
Avg. Min. 57.3 [+0.2]
Mean      66.2 [+0.1]
24-hour corrected mean: 66.0
Max. for month: 88F on the 28th
Min. for month: 45F on the 4th

COOLING DEGREE DAYS
Total cooling units:    81 [-24]
Total for the season:   89 [-40]
Total for last season: 159

HEATING DEGREE DAYS
Total cooling units:     36  [-37]
Total for the season:  6254 [-122]
Total for last season: 5916

PRECIPITATION, Inches
Total: 4.08 [-0.23]
Greatest in 24 hrs: 1.30 ins. on the 10th-11th 

WIND, mph
Avg. uncorrected wind speed: 9.9
Avg. corrected wind speed: 10.5
Prevailing wind direction: S at 17%
Peak gust and direction: 41 W on 3rd  

SUNSHINE:
Campbell-Stokes card minutes: 14118 minutes of possible 26376 or 54%
Astronomical total minutes:   14674 minutes of possible 27416 or 54%


Today's Observations:

7 A.M.
Weather: Fog
Temperature: 70F; Dew Point: 70F; Wind: SE at 3 kts
Wind: Light
Sea-level pressure: 29.72 ins. Hg, rising, falling, then rising
Visibility: 1/16 mile
6-hr Max temp: 70F
6-hr Min temp: 68F
24-hr Precip: 0.44 ins.
BHO SA 1155 W3 X 1/16F 064/70/70/1303/972/ WND LGT/ 8//// 55003 
70044 10070 20068

10 A.M.
Weather: Overcast stratocumulus
Temperature: 74F; Dew Point: 74F; Wind: NNW at 5 kts
Wind: Light
Sea-level pressure: 29.70 ins. Hg, falling, then steady
Visibility: 20 miles
3-hr Precip: 0.01 ins.
BHO SA 1455 E19 OVC 20 059/74/74/3405/970/ WND LGT/ 8/5/// 56005 
6010/

1 P.M.
Weather: Broken cumulus, few cumulonimbus WNW-NNW
Temperature: 81F; Dew Point: 74F; Wind: WNW at 6 kts
Wind: Light
Sea-level pressure: 29.69 ins. Hg, rising, then falling
Visibility: 35 miles
6-hr Max temp: 81F
6-hr Min temp: 70F
6-hr Precip: 0.10 ins. 
BHO SA 1755 E23 BKN 35 056/81/74/2906/969/ FEW CB WNW-NNW WND LGT/
8/200 58003 6010/ 10081 20070

SUMMARY FOR THURSDAY, JULY 11, 2019 

TEMPERATURE (DEGREES F)
MAX.....81   NORMAL.....81
MIN.....67   NORMAL.....63
MEAN....74   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL......................+2  
TOTAL DEPARTURE FOR THE MONTH.....................+43 [+3.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............9   DEPARTURE.........-4
TOTAL COOLING UNITS FOR THE MONTH.............111   DEPARTURE........+40
TOTAL COOLING UNITS FOR THE SEASON............200   DEPARTURE..........0
TOTAL COOLING UNITS LAST SEASON TO DATE.......276   DEPARTURE........-76

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................35 S AT 3:01 P.M. 
                   AERO.........................33 S AT 3:02 P.M.  
                   ASOS.........................36 S AT 3:04 P.M. 
                   DAVIS........................36 S AT 3:03 P.M.  RMY 36
FASTEST MILE FOR YESTERDAY......................25 S AT 4:42 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................25 S AT 4:42 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 S AT 3:29 P.M.
AVERAGE WIND SPEED AND DIRECTION...............12.1 S
                   ASOS........................11.8
                   DAVIS.......................11.8 S [183 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.44  DEPARTURE......0.31
                         ASOS..............0.44
TOTAL PRECIPITATION FOR THE MONTH..........1.27  DEPARTURE......0.01
                         ASOS..............1.27
TOTAL PRECIPITATION FOR THE YEAR..........31.14  DEPARTURE......+2.91
                         ASOS.............31.04

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 71/54/63/+1/0.00/551/61               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/0.02/417/46               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/0.02/753/83               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/717/79               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/0.03/527/58               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/0.06/428/47               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/885/97               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/840/93               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/0.29/712/78               26 SSE AERO 25 SSE RMY 33 
06/11 73/58/66/+1/1.03/247/27               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/0.00/869/95               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/0.81/000/00              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/540/59               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/879/96               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/0.13/000/00                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/0.00/348/38               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/0.10/000/00                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/0.00/101/11               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/0.26/000/00               26 S   AERO 26 S   RMY 29
06/21 68/58/63/-5/0.75/018/02               32 NW  AERO 28 NW  RMY 33
06/22 77/56/67/-1/T/779/85                  33 NW  AERO 32 NW  RMY 35
06/23 82/59/71/+3/0.00/871/95               30 NW  AERO 25 WNW RMY 29
06/24 84/61/73/+4/0.00/779/85               22 NW  AERO 21 NW  RMY 22
06/25 73/61/67/-2/0.18/083/09               35 S   AERO 37 S   RMY 37
06/26 77/64/71/+2/0.00/559/61               12 ENE AERO 18 SE  RMY N/A
06/27 81/57/69/0/0.00/614/67                21 NE  AERO 18 NE  RMY N/A
06/28 88/64/76/+6/0.00/870/95               16 SW  AERO 18 SW  RMY N/A
06/29 80/66/73/+3/0.29/165/18               25 W   AERO 25 W   RMY 26
06/30 75/59/67/-3/0.13/430/47               31 N   AERO 30 N   RMY 35

*Estimated

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/.../..               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/.../..               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/.../..               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/.../..               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/.../..               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/.../..              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/.../..                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/.../..               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/.../..               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/.../..               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/..../.../..               35 S   AERO 33 S   RMY 36

Low temp since midnight is 67F; normal low is 63F

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

RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

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

TODAY'S REPORT PREPARED BY: Nicholas Rousseau