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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 11, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

NEW MAXIMUM TEMPERATURE DAILY RECORD FOR TODAY

The maximum temperature measured at the 1:00PM EST
observation today was 83F, breaking the previous
record of 78F set in 1945.  This morning's overnight
low of 50F could also be a high minimum temperature
record if the evening temperatures do not fall below
50F before midnight.

The high of 83F today is the warmest temperature at
the Observatory in nearly seven months, since 87F was
recorded on September 14th, 2016. 

Winds were calmer today but still out of the southwest.
Conditions were much hazier and limited visibility to 
40 miles during the morning observations but improved
to 70 miles by 1:00PM.  


Today's Observations:

7 A.M.
Weather: Few cirrus in all directions
Temperature: 55F; Dew Point: 43F; Wind: SSW at 11 kts
Sea-level pressure: 30.12 ins. Hg, steady then rising
Visibility: 40 miles, hazy
6-hr Max temp: 55F
6-hr Min temp: 50F
24-hr precip: 0.00
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 40 199/55/43/2011/012/ FEW CI ALQDS HAZY/
8/001 53013 10055 20050

10 A.M.
Weather:Broken cirrostratus  
Temperature: 72F; Dew Point: 46F; Wind: SW at 8 kts
Sea-level pressure: 30.12 ins. Hg, Rising unsteadily
Visibility: 40 miles, Hazy
BHO SA 1455 E250 BKN 40 201/72/46/2208/012/ HAZY/ 8/008 50002

1 P.M.
Weather: Broken cirrostratus
Temperature: 82F; Dew Point: 46F; Wind: SSW at 7 kts
Sea-level pressure: 30.08 ins. Hg, falling, then more quickly
Visibility: 70 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 55F
BHO SA 1755 E250 BKN 70 187/82/46/2007/008/ HAZY/ 8/008 58014 
10083 20055

SUMMARY FOR MONDAY, APRIL 10, 2017
 
TEMPERATURE (DEGREES F)
MAX.....77   NORMAL.....53
MIN.....45   NORMAL.....36
MEAN....61   NORMAL.....45

DEPARTURE FROM 30-YEAR NORMAL........................+16
TOTAL DEPARTURE FOR THE MONTH........................+16 [+1.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............4   DEPARTURE.........-16
TOTAL HEATING UNITS FOR THE MONTH.............206   DEPARTURE.........-16
TOTAL HEATING UNITS FOR THE SEASON...........5108   DEPARTURE........-598
TOTAL HEATING UNITS LAST SEASON TO DATE......4680   DIFFERENCE.......+428

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................37 S   AT 2:07 P.M.
                   AERO........................37 S   AT 2:07 P.M.
                   ASOS........................40 S   AT 2:07 P.M.
                   DAVIS.......................40 SW  AT 2:07 P.M. RMY 39
FASTEST MILE FOR YESTERDAY.....................28 S   AT 2:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................28 SSW AT 2:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................28 SW  AT 2:17 9.M.
AVERAGE WIND SPEED AND DIRECTION.............16.8 S
                   ASOS......................17.5
                   DAVIS.....................15.6 SW [220 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.18
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........4.26  DEPARTURE......+2.56
                         ASOS..............4.27
TOTAL PRECIPITATION FOR THE YEAR..........18.38  DEPARTURE......+2.68
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1
TOTAL SNOWFALL FOR THE MONTH................2.7  DEPARTURE.......+1.1
TOTAL SNOWFALL FOR THE SEASON..............66.4  DEPARTURE.......+5.1


PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41
4/2  53/30/42/+1/0.00/0.0/.../..           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/.../..           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/.../..           41 ESE AERO 43 ESE RMY 42
4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A
4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM
4/7  53/38/46/+3/0.00/0.0/.../..           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/.../..           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/.../..           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/.../..          37 S   AERO 37 S   RMY 39

4/11 Low temp since midnight is 50F; normal low is now 36F

DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF xxF,
         BREAKS PREVIOUS RECORD OF 78F SET IN 1945

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

RECORDS FOR APRIL 11
HIGH 78 IN 1945
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963

RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 12.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle