Sunday, February 23, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, FEBRUARY 23, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

SPRINGLIKE WITH LIMITED VISIBILITY AND A WARM
WESTERLY WIND….

Today we continue to experience milder weather, with
almost clear skies. However, visibility is limited to
only 35 miles due to a distant haze. Humidity is low
like yesterday’s, reaching 30% by the 1 P.M. observation.
Wind has increased from the west, reaching 24 mph after
noontime. Many hikers are out on the hill today due to
the exceptional weather, and the observatory is open
until 4 P.M. if anyone wants to pay us a visit.

The high so far today is 51F degrees, this is 12 degrees
above the normal of 39F. The low since midnight is 30F,
9 degrees above the normal daily minimum of 21F.

Today’s Observations:

7 A.M.
Weather: Few cirrostratus
Temperature: 31F; Dew Point: 15F; Relative Humidity: 49%
Wind: WSW at 10 kts
Sea-level pressure: 30.17 ins. Hg: falling then rising
Visibility: 35 miles, distant haze
6-hr Max temp: 32F
6-hr Min temp: 30F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 35 217/31/15/2410/017/ FEW CS DSNT HZ ALQDS/
8/008 51006 10032 20030

10 A.M.
Weather: Few cirrostratus
Temperature: 43F; Dew Point: 22F; Relative Humidity: 43%
Wind: W at 7 kts
Sea-level pressure: 30.17 ins. Hg: steady
Visibility: 35 miles, distant haze
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 35 217/43/22/2607/017/ FEW CS DSNT HZ ALQDS/
8/008 54000

1 P.M.
Weather: Few cirrostratus
Temperature: 51F; Dew Point: 20F; Relative Humidity: 30%
Wind: W at 12G20 kts
Sea-level pressure: 30.10 ins. Hg: falling, then more quickly
Visibility: 35 miles, distant haze
6-hr Max temp: 51F
6-hr Min temp: 31F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 35 195/51/20/2712G20/010/ FEW CS DSNT HZ ALQDS/
8/008 58022 10051 20031

SUMMARY FOR SATURDAY, FEBRUARY 22, 2020

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..38
MIN…..23   NORMAL…..20
MEAN….34   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL………………..+5
TOTAL DEPARTURE FOR THE MONTH……………….+98 [+4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………..729  DEPARTURE…….-99
TOTAL HEATING UNITS FOR THE SEASON…………3958  DEPARTURE……-401
TOTAL HEATING UNITS LAST SEASON TO DATE…….4255  DEPARTURE……-297

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 W   AT 12:00 P.M.
AERO…………………….24 W   AT 12:01 P.M.
ASOS…………………….27 W   AT 12:01 P.M.
DAVIS……………………28 W   AT 12:00 P.M. RMY 27
FASTEST MILE FOR YESTERDAY………………….21 W   AT  2:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 W   AT  2:39 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 W   AT 12:01 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.5 W
ASOS…………………..13.7
DAVIS………………….13.8 WSW [257 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.20  DEPARTURE……-0.90
ASOS…………..2.30
TOTAL PRECIPITATION FOR THE YEAR………..3.66  DEPARTURE……-3.79
ASOS…………..3.84

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.6  DEPARTURE……-10.4
TOTAL SNOWFALL FOR THE SEASON…………..24.8  DEPARTURE……-19.3

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01  38/30/34/+8/0.01/T/…./..          14 WSW AERO 14 WSW RMY N/A
02/02  40/30/35/+9/0.00/0.0/…./..        18 W   AERO 18 WNW RMY 18
02/03  44/27/36/+10/0.00/0.0/…./..       28 W   AERO 28 W   RMY 28
02/04  44/33/39/+13/0.00/0.0/…./..       19 E   AERO 16 E   RMY 18
02/05  41/30/36/+10/0.00/0.0/…./..       20 NNW AERO 19 NNW RMY N/A
02/06  31/30/34/+8/0.00/0.0/…./..        29 E   AERO 28 E   RMY 27
02/07  53/25/39/+12/…./0.1/…./..       71 WSW AERO 71 SSW RMY 73
02/08  33/20/27/0/T/T/…./..              46 W   AERO 44 W   RMY 44
02/09  33/15/24/-3/T/T/…./..             30 SSE AERO 29 SSE RMY N/A
02/10  42/33/38/+11/…./0.0/…./..       39 SSW AERO 39 SSW RMY 39
02/11  40/36/38/+11/…./0.0/…./..       24 W   AERO 23 W   RMY N/A
02/12  41/30/36/+9/0.00/0.0/…./..        37 W   AERO 36 W   RMY N/A
02/13  35/31/34/+6/.00/0.0/…./..         29 SSW AERO 29 SSW RMY N/A
02/14  33/8/21/-7/0.00/0.0/…./..         32 WNW AERO 32 NW  RMY 34
02/15  27/4/16/-12/0.00/0.0/…./..        31 SSW AERO 31 SSW RMY N/A
02/16  40/23/32/+4/0.00/0.0/…./..        38 SW  AERO 38 SW  RMY N/A
02/17  44/28/36/+8/0.00/0.0/…./..        25 WNW AERO 24 WNW RMY 24
02/18  37/27/32/+3/0.31/T/…./..          26 SE  AERO 26 SE  RMY N/A
02/19  42/25/34/+5/0.00/0.0/…/..         45 W   AERO 46 W   RMY 44
02/20  31/18/25/-4/0.00/0.0/…/..         32 W   AERO 32 W   RMY N/A
02/21  30/11/21/-8/0.00/0.0/…/..         24 NNW AERO 21 N   RMY N/A
02/22  44/23/34/+5/0.00/0.0/…/..         26 W   AERO 24 W   RMY 27

02/23 The low since midnight is 23F, daily normal minimum is 21F

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

RECORDS FOR FEBRUARY 23
HIGH 67F IN 2017
LOW -8F IN 1907
PRECIP 1.48 INCHES IN 1967
SNOWFALL 10.6 INCHES IN 1967
PEAK GUST 73 MPH WNW IN 1974

RECORDS FOR FEBRUARY 24
HIGH 71F IN 2017
LOW -11F IN 1894
PRECIP 3.10 INCHES IN 1969
SNOWFALL 27.4 INCHES IN 1969 [HIGHEST CALENDAR DAY AMOUNT ON RECORD] PEAK GUST 63 MPH NE IN 1998

TODAY’S REPORT PREPARED BY: Benjamin Turner