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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 25, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

SPRING SHOWERS ARRIVE AT GREAT BLUE HILL BRINGING
GUSTY NORTHEAST WINDS

Light rain began this morning around 4:00AM EST and
stopped before the 10:00AM observation.  Heavier rain
began again near noon and is expected to continue into
the evening.  Precipitation totaled 0.15 inches for
the day so far at 1:00PM, with 0.01 inches measured
at 7:00AM.

Fog limited visibility to 2 1/2 miles this morning and
cleared to 20 miles by late morning.  Fog returned with
rain in the afternoon and brought visibility down to 1
mile.

Winds have been out of the northeast all day.  Gusts
over 20 MPH began at 7:00AM and reached up to 35 MPH
this afternoon.  The gusty winds and temperatures in the
low 40s make for a wind chill of 36F. 


Today's Observations:

7 A.M.
Weather: Light rain, sky obscurement due to fog
Temperature: 45F; Dew Point: 45F; Wind: NE at 13G21 kts
Sea-level pressure: 30.27 ins. Hg, rising, then more quickly
Visibility: 2 1/2 miles
6-hr Max temp: 49F
6-hr Min temp: 44F
24-hr precip: 0.01 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 W3 X 2 1/2R-F 249/45/45/0513G21/027/ 8//// 53019
MANUAL 6001/ 70001 ASOS 60001 70001 10049 20044

10 A.M.
Weather: Scattered stratus fractus, overcast stratus
Temperature: 45F; Dew Point: 43F; Wind: NE at 16G24 kts
Sea-level pressure: 30.27 ins. Hg, rising unsteadily
Visibility: 20 miles, distant fog in all directions
3-hr precip: Trace
3-hr snowfall: 0.0 in.
BHO SA 1455 6 SCT E13 OVC 20 250/45/43/0516G24/027/ DSNT FG ALQDS/
8/6// 50001 MANUAL 600// ASOS 60001 

1 P.M.
Weather: Rain, sky obscurement due to fog
Temperature: 43F; Dew Point: 42F; Wind: NE at 19G30 kts,
Peak Wind: 30 kts (35 MPH) NE at 12:55PM EST
Sea-level pressure: 30.23 ins. Hg, falling, then steady
Visibility: 1 mile
6-hr Max temp: 46F
6-hr Min temp: 43F
6-hr precip: 0.14 in.
6-hr snowfall: 0.0 in.
BHO SA 1455 W3 X 1RF 240/43/42/0519G30/023/ PK WND 0530/55/
8//// 58010 MANUAL 6014/ ASOS 60011 10046 20043
  

SUMMARY FOR MONDAY, APRIL 24, 2017
 
TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....59
MIN.....42   NORMAL.....41
MEAN....56   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL.........................+6
TOTAL DEPARTURE FOR THE MONTH........................+94 [+3.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............9   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH.............381   DEPARTURE.........-87
TOTAL HEATING UNITS FOR THE SEASON...........5283   DEPARTURE........-669
TOTAL HEATING UNITS LAST SEASON TO DATE......4892   DIFFERENCE.......+391

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................23 SSW AT 12:18 A.M.*
                   AERO........................22 SSW AT 12:18 A.M.*
                   ASOS........................24 SSW AT 12:18 A.M.
                   DAVIS.......................25 SW  AT 12:17 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................17 SSW AT 12:07 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE..................17 SSW AT  3:12 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................18 SW  AT 12:03 A.M.
AVERAGE WIND SPEED AND DIRECTION..............9.1 SSW
                   ASOS.......................9.4
                   DAVIS......................7.9 SSW [210 deg.]
*LAST OF MULTIPLE OCCURRENCES

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE......-0.12
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........5.04  DEPARTURE......+1.29
                         ASOS..............5.09
TOTAL PRECIPITATION FOR THE YEAR..........19.16  DEPARTURE......+1.41
                         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.......-0.2
TOTAL SNOWFALL FOR THE SEASON..............66.4  DEPARTURE.......+3.8


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/+1/0.00/0.0/552/72           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/685/89           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/000/00           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/+3/0.00/0.0/226/29           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/666/85           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/716/91           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/560/71          37 S   AERO 37 S   RMY 39
4/11 85/50/68/+23/0.00/0.0/642/81          28 S   AERO 28 S   RMY 30
4/12 68/47/58/+13/0.01/0.0/382/48          26 WNW AERO 28 WNW RMY N/A
4/13 58/39/49/+3/0.00/0.0/567/71           28 WNW AERO 31 NW  RMY 30 
4/14 62/40/51/+5/0.00/0.0/801/100          22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/675/84           40 SSW AERO 45 SSW RMY 45
4/16 86/55/71/+24/T/0.0/758/94             38 W*  AERO 39 SW  RMY 42
4/17 75/48/62/+15/0.00/0.0/405/50          37 W   AERO 37 W   RMY 43
4/18 52/35/44/-4/0.00/0.0/779/96           25 ENE AERO 23 ENE RMY 25
4/19 54/34/44/-4/0.06/0.0/431/53           31 S   AERO 33 S   RMY 34
4/20 58/42/50/+1/0.05/0.0/270/33           25 SSW AERO 24 SSW RMY 23
4/21 45/42/44/-5/0.50/0.0/000/00           26 ESE AERO 29 ESE RMY 28
4/22 44/40/42/-7/0.14/0.0/.../..           22 NE  AERO 22 NNE RMY 20
4/23 65/37/51/+1/0.00/0.0/.../..           28 S   AERO 26 S   RMY 28
4/24 69/42/56/+6/0.00/0.0/.../..           23 SSW*AERO 22 SSW*RMY N/A

4/25 Low temp since midnight is 44F; normal low is now 41F


DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
         BREAKS PREVIOUS RECORD OF 78F SET IN 1945

4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
         TIES WITH PREVIOUS RECORD SET IN 1955


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

RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002
PEAK GUST 66 MPH SE IN 1968

RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle