Tuesday, November 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, NOVEMBER 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

COLDEST NIGHT OF THE SEASON THUS FAR,
23F RECORDED THIS MORNING UNDER CLEAR SKIES

Skies that cleared quickly yesterday morning remained
clear overnight, allowing radiational cooling to take
place. A minimum temperature of 23F was reached between
5:00 and 6:00 AM EST this morning, before temperatures
slowly made their way above freezing by mid morning.

Yesterday’s calendar maximum of 40F and minimum of 25F
marks the coolest day for the month of November. Temperatures
for the month now average 5.2 degrees F for November.

By the 1:00 PM EST observation skies were mostly clear
with only a few cumulus and altocumulus visible in the
distance. A maximum temperature of 41F had been recorded.
Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore E-SE,
few altocumulus distant SW-W and N
Temperature: 24F; Dew Point: 14F; Wind: W at 10 kts
Sea-level pressure: 30.29 ins. Hg, rising, then more quickly
Visibility: 75 miles
6-hr Max temp: 24F
6-hr Min temp: 23F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 75 258/24/14/2810/029/ FEW SC DSNT OFFSHR E-SE
FEW AC DSNT SW-W AND N/ 8/530 53021 10024 20023

10 A.M.
Weather: Clear, few altocumulus distant S-NW
Temperature: 34F; Dew Point 19F; Wind: W at 9 kts,
Sea-level pressure: 30.35 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 277/34/19/2809/035/ FEW AC DSNT S-NW/ 8/030
51019

1 P.M.
Weather: Clear, few cumulus SE-N, few altocumulus distant S
Temperature: 41F; Dew Point: 19F; Wind: WSW at 9 kts
Sea-level pressure: 30.31 ins. Hg. steady, then falling
Visibility: 70 miles
6-hr max. temp. 41F
6-hr min. temp. 24F
BHO SA 1755 CLR 70 265/41/19/2509/031/ FEW CU SE-N FEW AC DSNT S/
8/130 58012 10041 20024
SUMMARY FOR MONDAY, NOVEMBER 23, 2015

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..47
MIN…..25   NORMAL…..31
MEAN….33   NORMAL…..39

DEPARTURE FROM 30-YEAR NORMAL………………….-6
TOTAL DEPARTURE FOR THE MONTH………………..+125  [+5.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..32   DEPARTURE……….+6
TOTAL HEATING UNITS FOR THE MONTH………….383   DEPARTURE……..-125
TOTAL HEATING UNITS FOR THE SEASON…………837   DEPARTURE……..-234
TOTAL HEATING UNITS LAST SEASON TO DATE…….975   DIFFERENCE…….-138

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24 NW  AT   2:40 P.M.*
ASOS……………………30 NW  AT   3:18 P.M.
DAVIS…………………..26 NW  AT  12:17 P.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………21 NW  AT   2:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NW  AT   2:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 NW  AT   2:40 P.M.
AVERAGE WIND SPEED AND DIRECTION……………13.7 NNW
ASOS……………………13.2
DAVIS…………………..11.5 NNW [333 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.16
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.40  DEPARTURE…..-1.23
ASOS……………2.42
TOTAL PRECIPITATION FOR THE YEAR………..39.23  DEPARTURE…..-8.17
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

11/1  59/45/52/+6/T/006/01                  30 SSW RMY 31
11/2  62/47/55/+9/0.00/476/77               24 W   RMY N/A
11/3  71/44/58/+12/0.00/616/100             25 W   RMY 25
11/4  66/49/58/+13/0.00/601/98              22 SSW RMY N/A
11/5  72/51/62/+17/0.00/281/46              31 SW  RMY 36
11/6  71/60/66/+21/0.00/109/18              35 SSW RMY 38
11/7  64/46/55/+10/0.00/029/04              33 WNW RMY 35
11/8  54/39/47/+3/0.00/591/98               26 NW  RMY 30
11/9  59/38/49/+5/0.00/577/96               20 W   RMY 21
11/10 53/45/49/+5/…./000/00               28 NE  RMY N/A
11/11 48/43/46/+3/…./000/00               41 NE  RMY N/A
11/12 55/42/49/+6/…./000/00               28 S   RMY 30
11/13 57/41/49/+6/…./385/65               40 WSW RMY 47
11/14 45/31/38/-4/0.00/425/72               40 NW  RMY 47
11/15 51/31/41/-1/0.00/…/..               25 W   RMY 27
11/16 59/36/48/+6/0.00/…/..               25 NNW RMY 29
11/17 45/28/37/-4/0.00/…/..               18 NNE RMY N/A
11/18 50/35/43/+2/0.00/…/..               17 SSE RMY N/A
11/19 55/38/47/+6/…./…/..               29 SSE RMY N/A
11/20 58/41/50/+10/…./…/..              43 SSE RMY N/A
11/21 46/35/41/+1/0.00/…/..               20 ENE RMY 21
11/22 45/35/40/+0/…./000/00               26 NW  RMY 28
11/23 40/25/33/-6/0.00/…/..               24 NW  RMY 29

11/24 low since midnight is 23F; normal low is now 31F

DAILY RECORDS FOR NOVEMBER 2015

**11/6 DAILY RECORD MAXIMUM TEMPERATURE OF 71F
TIES PREVIOUS RECORD OF 71F SET IN 1959

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
BREAKS PREVIOUS RECORD OF 58F SET IN 1938

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
TIES PREVIOUS MONTHLY RECORD OF 60F SET ON
11/8/1996

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

RECORDS FOR NOVEMBER 24
HIGH 69 IN 1931
LOW 7 IN 1897
PRECIP 1.76 INCHES IN 1901
SNOWFALL 4.5 INS IN 1936
PEAK GUST 69 SSW IN 1959

RECORDS FOR NOVEMBER 25
HIGH 71 IN 1979
LOW 13 IN 1938
PRECIP 3.10 INCHES IN 1983
SNOWFALL 8.0 INS IN 1888
PEAK GUST 94e E IN 1950

TODAY’S REPORT PREPARED BY: Brian Fitzgerald