Saturday, May 25, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 25, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM DAY WITH CALM WINDS ON TOP OF THE GREAT BLUE HILL…

Winds significantly decreased compared to yesterday,
becoming light a variable at time. Clear sky’s at the
7 A.M. observation with increasing clouds during the
afternoon hours. Great visibility, with 80 miles observed
throughout the day. The high so far today is 74F, 6 degree
above the daily normal maximum of 68F. The low since midnight
is 56F, 6 degrees above the normal minimum of 50F.

Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 57F; Dew Point: 50F; Wind: WNW at 7 kts
Sea-level pressure: 30.16 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 61F
6-hr Min temp: 47F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 80 216/57/50/2907/016/ 8/000 51015 10061 20047

10 A.M.
Weather: Scattered cirrostratus
Temperature: 67F; Dew Point: 54F; Wind: WNW at 04 kts,
Wind: Wind Light
Sea-level pressure: 30.18 ins. Hg, steady then rising
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 80 221/67/54/2904/018/ FEW CU ALQDS
WND LGT 8/001 53005

1 P.M.
Weather: Broken cirrostratus
Temperature: 74F; Dew Point: 44F; Wind: WSW at 5 kts,
Sea-level pressure: 30.13 ins. Hg, falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 74F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 BKN 80 205/74/44/2505/013/ FEW CU FEW SC/
8/008 58016 10074 20061

SUMMARY FOR FRIDAY, MAY 24, 2019

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..68
MIN…..47   NORMAL…..50
MEAN….58   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH…………………..-55 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH………….273   DEPARTURE……..+45
TOTAL HEATING UNITS FOR THE SEASON………..6174   DEPARTURE……..-89
TOTAL HEATING UNITS LAST SEASON TO DATE……5825   DIFFERENCE……+349

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………4   DEPARTURE………-11
TOTAL COOLING UNITS FOR THE SEASON…………..4   DEPARTURE………39
TOTAL COOLING UNITS LAST SEASON TO DATE……..39   DEPARTURE……..-35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..47 NW AT 11:08 A.M.
AERO…………………….47 NW AT 11:21 A.M.
ASOS…………………….50 NNW AT 9:59 A.M.
DAVIS……………………50 W AT 9:58 A.M.  RMY 51
FASTEST MILE FOR YESTERDAY………………….35 NW AT 10:35 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….33 NW AT 10:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………36 NW AT 8:54 A.M.
AVERAGE WIND SPEED AND DIRECTION……………16.1 W
ASOS……………………15.7
DAVIS…………………..16.3 W [178 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.27  DEPARTURE…….+0.22
ASOS…………..3.23
TOTAL PRECIPITATION FOR THE YEAR……….24.45  DEPARTURE…….+2.85
ASOS………….24.28

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

05/01 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./…/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./…/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/…/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..     22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..     35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…/…/…/..     36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…/…/…/.. 47 NW  AERO 47 NW   RMY 51

05/25 Low temp since midnight is 48F; normal low is 50F

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

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)

TODAY’S REPORT PREPARED BY: Nicholas Rousseau