Friday, May 31, 2019

| May 31, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 31, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

INCREASING CLOUDS WITH LOW VISIBILITY AND HAZY CONDITIONS…

Rainfall overnight left 0.62 inches in the gauge by the 7 A.M.
observation. Winds were light through the early morning hours
picking up as the day progressed. Hazy conditions led to poor
visibility throughout the day along with increasing clouds. The
high so far today is 72F, 2 degrees above the daily normal maximum
of 70F. The low since midnight is 46F, 6 degrees below the normal
minimum of 52F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus
Temperature: 62F; Dew Point: 61F; Wind: WNW at 9 kts,
Sea-level pressure: 30.01 ins. Hg, rising, then more quickly
Visibility: 35 miles, distant haze
6-hr Max temp: 63F
6-hr Min temp: 53F
24-hr Precip: 0.62 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 35 162/62/61/3009/001/ FEW AC DSNT HZ ALQDS/
8/005 70062 53022 10063 20053

10 A.M.
Weather:  Scattered cumulus
Temperature: 71F; Dew Point: 64F; Wind: N at 7 kts,
Sea-level pressure: 29.94 ins. Hg, rising, then more quickly
Visibility: 35 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 35 SCT 35 139/71/64/3507/994/ FEW AC DSNT HZ ALQDS/
8/200 53023

1 P.M.
Weather: Scattered cumulus, scattered altocumulus
Temperature: 67F; Dew Point: 59F; Wind: ENE at 10 kts
Sea-level pressure: 29.94 ins. Hg, rising then falling
Visibility: 45 miles, distant haze
6-hr Max temp: 72F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 35 SCT 85 SCT 45 139/67/59/0610/994/
DSNT HZ ALQDS/ 8/260 50003 10072 20062

SUMMARY FOR THURSDAY, MAY 30, 2019

TEMPERATURE (DEGREES F)
MAX…..63   NORMAL…..70
MIN…..46   NORMAL…..52
MEAN….55   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………..-6
TOTAL DEPARTURE FOR THE MONTH…………………..-68 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..10   DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH………….316   DEPARTURE……..+33
TOTAL HEATING UNITS FOR THE SEASON………..6217   DEPARTURE……..-81
TOTAL HEATING UNITS LAST SEASON TO DATE……5847   DIFFERENCE……+370

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………8   DEPARTURE……..-13
TOTAL COOLING UNITS FOR THE SEASON…………..8   DEPARTURE……..-15
TOTAL COOLING UNITS LAST SEASON TO DATE……..59   DEPARTURE……..-51

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23  S  AT 7:39 P.M.
AERO…………………….23  S  AT 7:33 P.M.
ASOS…………………….25  S  AT 7:40 P.M.
DAVIS……………………28  S  AT 7:39 P.M.  RMY 25
FASTEST MILE FOR YESTERDAY………………….19  S  AT 7:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18  S  AT 7:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20  S  AT 7:41 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….6.4 S
ASOS…………………….6.9
DAVIS……………………6.8 S [172 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.62  DEPARTURE…….+0.46
ASOS…………..0.63
TOTAL PRECIPITATION FOR THE MONTH……….4.71  DEPARTURE…….+0.75
ASOS…………..4.52
TOTAL PRECIPITATION FOR THE YEAR……….25.89  DEPARTURE…….+3.38
ASOS………….25.73

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/T/…/..          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 57/48/53/-8/…./0.0/…/..           26 E   AERO 22 ESE  RMY 25
05/29 51/45/48/-13/…./0.0/…/..          21 NNW AERO 21 NNW  RMY N/A
05/30 63/46/55/-6/…../0.0/…/..     23 S   AERO 23 S    RMY 25

05/31 Low temp since midnight is 46F; normal low is 52F

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

RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month]
PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

Category: Daily Discussions

Leave a Reply