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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 14, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

WIND FROM THE NORTHEAST BRINGS COOLER AIR MAKING
FOR A BELOW SEASONABLE TEMPERATURE DAY....

Wind from the NE has allowed temperatures to return
to below seasonable with a max of 51F by 1:00 P.M. The 
daily normal is 55F. Since midnight the low was a 
slightly above seasonable 43F. This is 6 degrees above 
the daily normal of 37F. The wind shifted after midnight 
temperatures began to return to more seasonable. With wind 
from the south yesterday on average the day was 10 degrees 
above the daily average of 55F. Today began with light 
wind but it picked up starting at 7:00 A.M. with frequent 
gust over 22 kts (25 MPH) throughout the day.
Humidity was low today but visibility continued to be
limited by a distant haze. 

Today's Observations:

7 A.M.
Weather: Scattered cirrostratus, few cumulus SSW-NW, few
altocumulus NNE  
Temperature: 48F; Dew Point: 40F; Wind: NE at 9G18 kts
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly     
Visibility: 40 miles, distant haze in all directions  
6-hr Max temp: 48F
6-hr Min temp: 43F
24-hr precip: Trace 
24-hr snowfall: 0.0 ins.  
Snow depth: 0 ins.
BHO SA 1155 230 SCT 30 155/48/40/0409G18/999/ FEW CU SSW-NW 
FEW AC NNE DSNT HZ ALQDS/ 8/036 53035 10048 20043 

10 A.M.
Weather: Broken stratocumulus, broken cirrostratus 
Temperature: 50F; Dew Point: 40F; Wind: ENE at 14G22 kts
Sea-level pressure: 30.00 ins. Hg, rising unsteadily
Visibility: 60 miles, distant haze in all directions
3-hr precip: 0.00 ins. 
3-hr snowfall: 0.0 ins. 
BHO SA 1455 E25 BKN 230 BKN 60 581/50/40/0714G22/000/ 
DSNT HZ ALQDS/ 8/505 51026

1 P.M.
Weather: Broken stratocumulus, broken stratus 
Temperature: 50F; Dew Point: 37F; Wind: ENE at 10G20 kts
Sea-level pressure: 30.11 ins. Hg, rising, then more slowly
Visibility: 60 miles, except WSW-WNW 45 miles, distant haze 
in all directions
6-hr Max temp: 51F
6-hr Min temp: 48F
6-hr precip: 0.00 ins. 
6-hr snowfall: 0.0 ins. 
Snow depth: 0 ins.
BHO SA 1755 30 SCT E35 BKN 60 196/50/37/0610G20/011/ 
VSBY 45 WSW-WNW DSNT HZ ALQDS/ 8/600 53015 10051 20048 

SUMMARY FOR FRIDAY, APRIL 13, 2018

TEMPERATURE (DEGREES F)
MAX.....65   NORMAL.....55
MIN.....47   NORMAL.....37
MEAN....56   NORMAL.....46

DEPARTURE FROM 30-YEAR NORMAL..........................+10
TOTAL DEPARTURE FOR THE MONTH..........................-47 [-3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............9   DEPARTURE.........-10
TOTAL HEATING UNITS FOR THE MONTH............328   DEPARTURE.........+47
TOTAL HEATING UNITS FOR THE SEASON..........5387   DEPARTURE........-379
TOTAL HEATING UNITS LAST SEASON TO DATE.....5131   DIFFERENCE.......+255

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................37 SSW AT 12:38 A.M.  
                   AERO........................37 SSW AT 12:38 A.M.
                   ASOS........................38 SSW AT 12:39 A.M.
                   DAVIS.......................40 M   AT  1:58 A.M ** RMY N/A
FASTEST MILE FOR YESTERDAY.....................28 SSW AT 12:39 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................28 SSW AT  2:21 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................31 M   AT  2:02 A.M.**
AVERAGE WIND SPEED AND DIRECTION.............11.4 SSW
                   ASOS......................11.4
                   DAVIS.....................11.6 M**
** Davis direction malfunctioning 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.17
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.16  DEPARTURE......-1.04
                         ASOS..............1.15  
TOTAL PRECIPITATION FOR THE YEAR..........19.96  DEPARTURE......+3.94
                         ASOS.............21.39

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.1
TOTAL SNOWFALL FOR THE MONTH................2.6  DEPARTURE........+0.6
TOTAL SNOWFALL FOR THE SEASON..............92.8  DEPARTURE.......+31.0

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

4/01 58/33/46/+5/..../0.0/336/44   45 SSW AERO 43 SSW RMY N/A  
4/02 38/30/34/-7/..../1.6/077/10   20 SSW AERO 15 SSW RMY 17
4/03 48/30/39/-3/..../0.0/.../..   28 SSE AERO 25 SSE RMY 25
4/04 54/36/45/+3/..../0.0/.../..   56 WNW AERO 56 WNW RMY 54
4/05 40/27/34/-9/0.00/0.0/.../..   53 WNW AERO 53 WNW RMY 52 
4/06 41/25/33/-10/0.25/1.0/.../..  37 S   AERO 36 S   RMY 38
4/07 46/32/35/-4/0.00/0.0/.../..   32 WNW AERO 35 WNW RMY 34
4/08 41/29/35/-9/0.00/0.0/.../..   35 WNW*AERO 31 WNW RMY 34
4/09 45/24/35/-9/0.00/0.0/.../..   28 WNW*AERO 25 WNW RMY 29
4/10 39/31/35/-10/T/T/.../..       14 SSW AERO 13 SSW RMY N/A
4/11 48/29/39/-6/T/0.0/.../..      24 SSE AERO 23 SSE RMY 25 
4/12 61/33/47/+2/..../0.0/.../..   39 SSW AERO 38 SSW RMY 41 
4/13 65/47/56/+10/T/0.0/.../..     37 SSW AERO 37 SSW RMY N/A

4/14 Low temp since midnight is 43F; normal low is now 37F

*Estimated

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

RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007       

TODAY'S REPORT PREPARED BY: K.A. Geagan