Tuesday, May 28, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 28, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIGHT RAIN AND DECREASING
VISIBILITY….

We observed light rain that continued following the
7 AM. observation, only amounting to 0.02 inches so
far today. Visibility decreased from 70 miles this
morning to 10 miles at 1 P.M. due to fog. Wind from
the east has strengthened slightly as the day went on,
with a max gust of 25 mph measured this afternoon. The
high so far today is 57F, 13 degrees below the daily
normal maximum of 70F. The low since midnight is 49F,
2 degrees below the normal minimum of 51F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, broken cirrostratus
Temperature: 55F; Dew Point: 36F; Wind: E at 8G14 kts
Sea-level pressure: 30.03 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 60 SCT E250 BKN 70 171/55/36/0808G14/003/
8/408 52014 10057 20053

10 A.M.
Weather: Scattered altostratus
Temperature: 55F; Dew Point: 38F; Wind: ESE at 11G20 kts
Sea-level pressure: 29.98 ins. Hg, falling steadily
Visibility: 70 miles
3-hr Precip: Trace
BHO SA 1455 E110 OVC 70 151/55/38/1111G20/998/
8/01/ 600// 58020

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus,
light rain
Temperature: 49F; Dew Point: 45F; Wind: E at 14G21 kts
Sea-level pressure: 29.93 ins. Hg, falling steadily
Visibility: 10 miles, fog
6-hr Max temp: 57F
6-hr Min temp: 49F
6-hr Precip: 0.02 ins.
BHO SA 1755 E50 BKN 65 OVC 10R-F 137/49/45/0914G21/
993/ R-CTD/ 8/72/ 6002/ 55014 10057 20049

SUMMARY FOR MONDAY, MAY 27, 2019

TEMPERATURE (DEGREES F)
MAX…..76   NORMAL…..69
MIN…..57   NORMAL…..51
MEAN….67   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL……………………+7
TOTAL DEPARTURE FOR THE MONTH…………………..-41 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH………….277   DEPARTURE……..+31
TOTAL HEATING UNITS FOR THE SEASON………..6178   DEPARTURE…….-103
TOTAL HEATING UNITS LAST SEASON TO DATE……5836   DIFFERENCE……+342

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH……………8   DEPARTURE………-9
TOTAL COOLING UNITS FOR THE SEASON…………..8   DEPARTURE……..-11
TOTAL COOLING UNITS LAST SEASON TO DATE……..52   DEPARTURE……..-44

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 NE   AT  8:18 P.M.
AERO…………………….22 NE   AT  8:16 P.M.
ASOS…………………….27 NNE  AT  8:19 P.M.
DAVIS……………………27 NE   AT  8:19 P.M.  RMY 27
FASTEST MILE FOR YESTERDAY………………….18 NE   AT  8:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NNE  AT  8:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 NE   AT  8:22 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….8.4 NNW
ASOS…………………….8.9
DAVIS……………………8.7 N [11 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.74  DEPARTURE…….+0.23
ASOS…………..3.56
TOTAL PRECIPITATION FOR THE YEAR……….24.92  DEPARTURE…….+2.86
ASOS………….24.71

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/…./0.0/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./0.0/…/..           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 75/47/61/+1/…./…/…/..    M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/…./0.0/…/..           40 W   AERO 38 W    RMY 39
05/27 76/57/67/+7/…./0.0/…/..           30 NE  AERO 22 NE   RMY 27

05/28 Low temp since midnight is 53F; normal low is 51F

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

RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner