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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 10, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST AND COOL WITH VERY LIGHT PRECIPITATION STARTING
IN THE AFTERNOON....

Today started cool and remained cool with a high temperature
so far of 62F. This is 12 degrees below the daily normal of
74F. Skies remained overcast, with a very light rain beginning
around noontime. Visibility this morning was 70 miles, but 
decreased to 40 miles by the 1 P.M. observation. Wind 
was moderate most of the day, frequently gusting above 20 mph. 

Today's Observations:

7 A.M.
Weather: Broken stratocumulus, overcast cirrostratus  
Temperature: 59F; Dew Point: 47F; Wind: E at 10G22 kts
Sea-level pressure: 30.33 ins. Hg, rising, then steady     
Visibility: 70 miles
6-hr Max temp: 59F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.  
BHO SA 1155 E50 BKN 200 OVC 70 270/59/47/0910G22/033/ FEW CU ALQDS/
8/806 51007 10059 20056

10 A.M.
Weather: Broken stratocumulus, overcast altostratus  
Temperature: 62F; Dew Point: 52F; Wind: E at 12G22 kts
Sea-level pressure: 30.34 ins. Hg, falling then rising 
Visibility: 70 miles
3-hr Precip: 0.00 ins. 
BHO SA 1455 E50 BKN 150 OVC 70 274/62/52/0912G22/034/ FEW CU ALQDS/ 
8/81/ 50004

1 P.M.
Weather: Overcast nimbostratus, very light rain
Temperature: 62F; Dew Point: 55F; Wind: E at 13G22 kts
Sea-level pressure: 30.33 ins. Hg, falling steadily   
Visibility: 40 miles 
6-hr Max temp: 62F
6-hr Min temp: 59F
6-hr Precip: Trace
BHO SA 1755 E150 OVC 40R- 270/62/55/1013G22/033/ PCPN VRY LGT/
8/02/ 58004 6000/ 10062 20059  

SUMMARY FOR SUNDAY, SEPTEMBER 9, 2018 

TEMPERATURE (DEGREES F)
MAX.....61   NORMAL.....74
MIN.....53   NORMAL.....57
MEAN....57   NORMAL.....66

DEPARTURE FROM 30-YEAR NORMAL.......................-9
TOTAL DEPARTURE FOR THE MONTH......................+40 [+4.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0  DEPARTURE..........-3
TOTAL COOLING UNITS FOR THE MONTH..............69  DEPARTURE.........+39
TOTAL COOLING UNITS FOR THE SEASON............822  DEPARTURE........+255
TOTAL COOLING UNITS LAST SEASON TO DATE.......621  DEPARTURE........+201

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY.....................23 NE  AT 11:15 A.M.
                   AERO..........................21 NE  AT 10:23 A.M.
                   ASOS..........................24 ENE AT 10:27 A.M.
                   DAVIS.........................24 M   AT  9:16 A.M.** RMY 25
FASTEST MILE FOR YESTERDAY.......................17 NE  AT 10:30 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................18 ENE AT 10:28 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...................18 M   AT 10:28 A.M.**
AVERAGE WIND SPEED AND DIRECTION................11.0 NE
                   ASOS.........................11.1
                   DAVIS........................11.3 M**   
**Davis direction missing 

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..........0.57  DEPARTURE......-0.52
                         ASOS..............0.53 
TOTAL PRECIPITATION FOR THE YEAR..........38.52  DEPARTURE......+2.59
                         ASOS.............40.05

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

9/1 75/58/67/-1/0.00/.../..        17 NE  AERO 15 NE  RMY 16         
9/2 83/61/72/+4/0.00/.../..        20 SSW AERO 18 SSW RMY N/A 
9/3 92/68/80/+13/0.00/.../..       24 WSW AERO 22 WSW RMY 25
9/4 88/70/79/+12/0.00/.../..       17 W   AERO 16 W   RMY 17 
9/5 89/67/78/+11/0.00/.../..       23 SSW AERO 23 SSW RMY 25 
9/6 92/70/81/+14/..../.../..       29 NNW AERO 29 NNW RMY N/A
9/7 70/63/67/+1/..../.../..        24 NE  AERO 22 NE  RMY N/A 
9/8 68/54/61/-5/0.00/.../..        22 NE  AERO 18 NE  RMY 21
9/9 61/53/57/-9/0.00/.../..        23 NE  AERO 21 NE  RMY N/A

9/10 Low temp since midnight is 56F; normal low is now 57F

DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
          BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
          TIES PREVIOUS RECORD OF 92F SET IN 1900 

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

RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972

RECORDS FOR SEPTEMBER 11
HIGH 93F IN 1983, 2013
LOW 37F IN 1917
PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA)
PEAK GUST 101 MPH NW IN 1954 (HURRICANE EDNA)

TODAY'S REPORT PREPARED BY: Benjamin Turner