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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 18, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

ABOVE NORMAL TEMPERATURES AND PARTLY CLOUDY SKIES

Skies were partly cloudy today with cirrus clouds
increasing in sky cover throughout the day.  A 
minimum temperature of 45F was recorded this morning, 
six degrees above the average minimum temperature of 
39F.  Temperatures reached a maximum of 67F this 
afternoon, 10F above the average maximum temperature.
By the 1:00PM EST observation, temperatures had fallen
to 60F.  Humidity remained low throughout the day 
staying near 20%-30%.

Today's Observations:

7 A.M.
Weather: Scattered cirrus, few stratocumulus WNW-NE
Temperature: 57F; Dew Point: 29F; Wind: N at 10 kts,
Sea-level pressure: 30.23 ins. Hg, rising, then more quickly
Visibility: 50 miles
6-hr Max temp: 57F 
6-hr Min temp: 45F
24-hr precip: 0.00 ins.
BHO SA 1155 250 SCT 50 237/57/29/0110/023/ FEW SC DSNT 
WNW-NE LGT DSNT HZ/ 8/502 53007 10057 20045

10 A.M.
Weather: Scattered cirrus
Temperature: 67F; Dew Point: 30F; Wind: NE at 10G14 kts,
Sea-level pressure: 30.24 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 250 SCT 70 242/67/30/0510G14/024/ LGT DSNT HZ/ 
8/002 51005

1 P.M.
Weather: Broken cirrus, few cumulus W-N
Temperature: 60F; Dew Point: 34F; Wind: E at 9 kts,
Wind: Direction variable NNE-ESE
Sea-level Pressure: 30.22 ins. HG, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 67F
6-hr Min temp: 56F
BHO SA 1755 250 SCT 70 235/60/34/0809/022/ FEW CU W-N 
LGT DSNT HZ WND 03V110/ 8/502 58007 10067 20056

SUMMARY FOR SUNDAY, APRIL 17, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....62   NORMAL.....56
MIN.....36   NORMAL.....38 
MEAN....49   NORMAL.....47

DEPARTURE FROM 30-YEAR NORMAL.........................+2
TOTAL DEPARTURE FOR THE MONTH........................-41 [-2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............16   DEPARTURE..........-2
TOTAL HEATING UNITS FOR THE MONTH.............395   DEPARTURE.........+41
TOTAL HEATING UNITS FOR THE SEASON...........4814   DEPARTURE.......-1024
TOTAL HEATING UNITS LAST SEASON TO DATE......6065   DIFFERENCE......-1251

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................20 NNE AT  8:47 A.M. 
                   ASOS........................20 NNE AT  8:46 A.M.    
                   DAVIS.......................17 NNE AT  8:48 A.M. RMY 19
FASTEST MILE FOR YESTERDAY.....................14  SW AT 10:53 P.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE..................15  SW AT 10:53 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 SSW AT 10:53 P.M.   
AVERAGE WIND SPEED AND DIRECTION...............8.8 NE 
                   ASOS........................9.1  
                   DAVIS.......................8.1 NE [40 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..........3.54  DEPARTURE......+0.75
                         ASOS..............3.83
TOTAL PRECIPITATION FOR THE YEAR..........16.12  DEPARTURE......-0.67
                         ASOS.............16.84

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)  
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.1
TOTAL SNOWFALL FOR THE MONTH...............15.0  DEPARTURE......+12.6
TOTAL SNOWFALL FOR THE SEASON..............57.5  DEPARTURE.......-5.1

PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

4/1  66/54/60/+19/..../0.0/092/12          39 SSW AERO N/A    RMY 43
4/2  54/40/47/+6/..../0.0/023/03           23 SSW AERO N/A    RMY N/A        
4/3  40/23/32/-10/..../7.7/354/46          46 W   AERO N/A    RMY 55
4/4  28/21/25/-17/0.68/7.3/000/00          29 NNE AERO N/A    RMY 25
4/5  35/19/27/-16/0.00/0.0/660/85          25 NW  AERO N/A    RMY 27
4/6  41/21/31/-12/..../0.0/483/62          44 S   AERO N/A    RMY N/A   
4/7  56/41/49/+6/..../0.0/000/00           53 SSE AERO 59 SSE RMY 55
4/8  52/32/42/-2/T/0.0/353/45              41 WSW AERO 45 WSW RMY 42
4/9  47/29/38/-6/0.00/0.0/417/53           33 NW  AERO 39 NW  RMY 32
4/10 49/26/38/-7/0.01/0.0/735/93           30 NW  AERO 32 NW  RMY 31
4/11 58/40/49/+4/0.00/T/182/23             47 S   AERO 52 S   RMY N/A
4/12 59/37/48/+3/0.30/0.0/040/05           53 S   AERO 60 S   RMY 54 
4/13 53/33/43/-3/0.00/0.0/798/100          21 NNW AERO 25 NNW RMY 21
4/14 48/33/41/-5/0.00/0.0/793/99           28 ENE AERO 28 NNE RMY 26
4/15 54/35/45/-2/0.00/0.0/804/100          26 NNE AERO 28 NNE RMY N/A
4/16 52/39/46/-1/0.00/0.0/.../...          36 NNE AERO 31 NNE RMY 34
4/17 62/36/49/+2/0.00/0.0/.../..           20 NNE AERO 20 NNE RMY 19

4/18  low temp since midnight is 45F; normal now 39F

DAILY RECORDS FOR APRIL 2016

4/1/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 54F,
BREAKS PREVIOUS RECORD OF 51F SET IN 1948

4/4/16: NEW DAILY RECORD SNOWFALL OF 7.3 INS, 
BREAKS PREVIOUS RECORD OF 3.7 INS SET IN 1975

4/4/16: NEW DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F,
BREAKS PREVIOUS RECORD OF 32F SET AND TIED IN 1896, 1908, 1975

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

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982

RECORDS FOR APRIL 19
HIGH 94 IN 1976 [RECORD FOR MONTH]
LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 6.0 IN. IN 1887
PEAK GUST 66 MPH E IN 1984

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle