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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 26, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY AND DRIZZLY WITH 1.04 INS. OF PRECIP BY AFTERNOON

1.04 ins. of rain was the storm total measured by the 1:00 P.M. EST 
observation. This puts us 1.14 ins. above normal for precipitation in 
the month of May. Stratus clouds covered the sky throughout the day, with 
broken stratocumulus forming in the afternoon. Visibility in the morning 
was very poor, getting no better than 2 miles, because of fog. Most of the 
fog in the immediate area lifted, giving Blue Hill 30 miles of visibility 
with some fog in the distance. It drizzled off and on until around noontime. 
More rain is expected to fall later in the day.

Temperatures stayed below normal again, with an overnight low of 46F and a 
high of 56F measured before 1:00 P.M. The average temperature yesterday was 
9F below normal. The maximum temperature reached yesterday was just 52F, 
which is 17F below the normal maximum of 69F. Blue Hill is now 20F below 
normal, despite having the very hot days last week.

Winds have been shifting from NE last night to W shortly after 1:00 P.M. 
Wind speeds have been increasing, and pressure has as well.


Today's Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 47F; Dew Point: 47F; Wind: N at 9 kts
Sea-level pressure: 29.48 ins. Hg, falling, then more quickly
Visibility: 1/2 mile, fog
6-hr Max temp: 49F
6-hr Min temp: 46F
24-hr precip: 1.00 in.
BHO SA 1155 E3 OVC 1/8F 983/47/47/0009/948/ 8/6// 58006 MANUAL 70100/ ASOS 
70104 10049 20046

10 A.M.
Weather: Drizzle, overcast stratus
Temperature: 49F; Dew Point: 49F; Wind: NW at 11G16 kts
Sea-level pressure: 29.52 ins. Hg, rising, then more quickly
Visibility: 1 1/2 mile, fog
3-hr precip: 0.04 in.
BHO SA 1455 E4 OVC 1 1/2LF 995/49/49/3211G16/952/ 8/6// 53012 MANUAL 60004/ 
ASOS 60004

1 P.M. 
Weather: Broken stratocumulus, overcast stratus
Temperature: 56F; Dew Point: 51F; Wind: WNW at 10G18 kts
Sea-level pressure: 29.56 ins. Hg, rising, then more quickly
Visibility: 30 miles, distant fog
6-hr Max temp: 56F
6-hr Min temp: 47F
6-hr precip: 0.04 in.
BHO SA 1755 E15 BKN 24 OVC 30 009/56/51/3010G18/956/ DSNT FG ALQDS/ 8/6// 
53014 MANUAL 60004/ ASOS 60004 10056 20047


SUMMARY FOR THURSDAY, MAY 25, 2017
 
TEMPERATURE (DEGREES F)
MAX.....52   NORMAL.....69
MIN.....49   NORMAL.....51
MEAN....51   NORMAL.....60

DEPARTURE FROM 30-YEAR NORMAL.........................-9
TOTAL DEPARTURE FOR THE MONTH........................-20 [-1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............14   DEPARTURE..........+8
TOTAL HEATING UNITS FOR THE MONTH.............274   DEPARTURE.........+40
TOTAL HEATING UNITS FOR THE SEASON...........5607   DEPARTURE........-662
TOTAL HEATING UNITS LAST SEASON TO DATE......5242   DIFFERENCE.......+365

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................36 E   AT 9:58 A.M.
                   AERO........................38 E   AT 9:57 A.M.
                   ASOS........................37 E   AT 9:58 A.M.
                   DAVIS.......................32 E   AT 9:58 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................26 E   AT 9:56 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................25 E   AT 9:55 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................23 ENE AT 9:55 A.M.
AVERAGE WIND SPEED AND DIRECTION.............15.8 NE
                   ASOS......................15.4
                   DAVIS.....................13.9 ENE [060 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.00  DEPARTURE......+0.84
                         ASOS..............1.04
TOTAL PRECIPITATION FOR THE MONTH..........4.35  DEPARTURE......+1.14
                         ASOS..............4.48
TOTAL PRECIPITATION FOR THE YEAR..........25.16  DEPARTURE......+3.40
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR MAY 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
M:    Missing data

5/1  50/43/47/-6/T/034/04                  21 N   AERO 18 N   RMY 22
5/2  65/42/54/+1/0.26/136/16               41 W   AERO 44 W   RMY 43               
5/3  52/42/53/0/0.00/595/70                37 WNW*AERO 39 WNW RMY 40
5/4  65/40/53/-1/0.00/724/85               23 S   AERO 23 S   RMY 24
5/5  51/44/48/-6/0.73/000/00               28 E   AERO 28 E   RMY N/A
5/6  65/50/58/+4/0.23/094/11               46 SSE AERO 48 SSE RMY 49
5/7  63/47/55/0/T/670/78                   35 S   AERO 38 S   RMY 39
5/8  54/38/46/-9/T/224/26                  29 WSW AERO 29 WSW RMY 32
5/9  53/36/45/-10/T/251/29                 20 ESE AERO 17 ESE RMY 19
5/10 57/42/50/-5/0.00/225/26               17 NNE AERO 16 NW  RMY N/A
5/11 58/45/52/-4/0.00/443/51               23 NE* AERO 23 NE  RMY 23 
5/12 57/41/49/-7/0.01/453/52               21 NE  AERO 20 NE  RMY 19
5/13 57/41/49/-7/0.19/009/01               24 ENE AERO 24 E   RMY N/A
5/14 47/43/45/-12/1.49/000/00              33 NNE AERO 36 N   RMY 36
5/15 58/43/51/-6/0.24/018/02               36 NNW AERO 40 NNW RMY 41
5/16 79/51/65/+8/0.00/870/99               26 WNW AREO 26 WNW RMY 29
5/17 90/60/75/+18/T/775/88                 32 SSE AERO 33 SW* RMY 34
5/18 96/69/83/+25/0.01/830/94              39 WNW AERO 41 WNW RMY 42 TSTM
5/19 89/56/73/+15/T/832/94                 35 W   AERO 33 W   RMY 37
5/20 67/49/58/0/0.00/.../..                23 NE  AERO 22 NE  RMY 21
5/21 66/45/56/-3/0.00/.../..               21 E   AERO 20 S   RMY 21
5/22 53/48/51/-8/..../.../..               22 S   AERO 22 S   RMY 23
5/23 70/51/61/+2/..../.../..               21 NNW AERO 18 NNW RMY 19
5/24 65/53/59/0/0.00/.../..                17 E   AERO 16 E   RMY N/A
5/25 52/49/51/-9/..../.../..               36 E   AERO 38 E   RMY N/A TSTM

5/26 Low temp since midnight is 46F; normal low is now 51F


DAILY RECORDS FOR MAY

5/17/17: DAILY RECORD MAXIMUM TEMPERATURE OF 90F,
         BREAKS PREVIOUS RECORD OF 88F SET IN 1974
         AND TIED IN 1977

5/17/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F,
         TIES PREVIOUS RECORD SET IN 1932

5/18/17: DAILY RECORD MAXIMUM TEMPERATURE OF 96F,
         BREAKS PREVIOUS RECORD OF 88F SET IN 1906
         AND TIED IN 1936 AND 1986;
         BREAKS PREVIOUS MONTHLY RECORD OF 94F SET ON
         MAY 26, 2010

5/18/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
         BREAKS PREVIOUS RECORD OF 61F SET IN 1943


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

RECORDS FOR MAY 26
HIGH 94F IN 2010
LOW 37F IN 1972,2013
PRECIP 1.73 INS IN 2003
SNOWFALL TRACE IN 1967 (Fell as ice pellets in nor'easter)
PEAK GUST 62 MPH NE IN 1967

RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

TODAY'S REPORT PREPARED BY: Lizzy Suzedell