Tuesday, April 25, 2023

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

TUESDAY, APRIL 25, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0448E
SUNSET:  1837E

A PARTLY CLOUDY DAY WITH GOOD VISIBILITY IN THE MORNING…

This morning has been lovely with partly cloudy skies and
good visibility. At the 10 o’clock observation, Mount
Monadnock was clearly visible, and the haze that was around
at the 7 o’clock observation disipated.

Our high temperature so far today has been 55F, and our low
since midnight was 42F. Our normal high temperature for today
is 61F, and our normal low is 42F.

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Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus
Temperature: 46; Dew Point: 43F; Relative Humidity: 87%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1020.8 mb; 30.14 in. Hg: rising unsteadily
Visibility: 40 miles, distant haze
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 15 SCT 40 208/46/43/3405/014/ WND LGT DSNT HAZE ALQDS/
8/800 52008 10046 20042

10 A.M.
Weather: Scattered stratocumulus
Temperature: 52F; Dew Point: 39F; Relative Humidity: 61%
Wind: WNW @ 4 kts, wind light and variable
Sea-level pressure: 1021.0 mb; 30.15 in. Hg: rising then falling
Visibility: 75 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 13 SCT 25 SCT 75 210/52/39/2904/015/ WND L/V/ 8/800 50002

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SUMMARY FOR MONDAY, APRIL 24, 2023

TEMPERATURE (DEGREES F)
MAX…….58   NORMAL…..60
MIN…….43   NORMAL…..41
MEAN……51   NORMAL…..51

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….0
TOTAL DEPARTURE FOR THE MONTH……………….+112 [+4.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..355  DEPARTURE……-106
TOTAL HEATING UNITS FOR THE SEASON…………4887  DEPARTURE……-921
TOTAL HEATING UNITS LAST SEASON TO DATE…….5255  DEPARTURE……-368

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….9  DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+8
TOTAL COOLING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+9

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.

F420C (Official)………..21 WNW @  12:13 A.M.
VECTOR #1 (1-Sec)……….22 WNW @  12:13 A.M.
VECTOR #2 (1-Sec)……….23 WNW @  12:13 A.M.
DAVIS #1……………….22 W   @  12:14 A.M.
DAVIS #2 ………………22 WNW @  12:14 A.M.
RMY #1 (Instantaneous)…..22 WNW @  12:13 A.M.
RMY #2 (Instantaneous)…..22 WNW @  12:13 A.M.
MERLIN…………………16 ENE
RICHARDS (C5C) (Inst)……22     @  12:13 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NW  @  12:12 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16     @  12:14 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19     @  12:14 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 WNW @  12:15 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 NW  @  12:15 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 WNW @  12:14 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 WNW @  12:14 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17     @  12:14 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………6.6 NW [158 total miles] VECTOR #1……………….6.9
VECTOR #2……………….7.2
DAVIS #1………………..6.7 N
DAVIS #2………………..6.9 N
RMY #1………………….6.8 NNW
RMY #2………………….7.1 N
RICHARDS (C5C)…………..7.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..1.53 DEPARTURE…..-2.37
TOTAL PRECIPITATION FOR THE YEAR…………..16.14 DEPARTURE…..-1.78

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-2.7
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.7

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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

4/1   60/39/50/+9/0.39/0.0/145/19         36 SW   VEC1 40 SW  RMY 41
4/2   50/30/40/-1/0.00/0.0/636/83         40 NNW  VEC1 44 NNW RMY 45
4/3   51/28/40/-2/0.00/0.0/737/96         41 SSW  VEC1 46 SSW RMY 46
4/4   62/40/51/+9/0.00/0.0/594/77         26 ENE  VEC1 26 ENE RMY 27
4/5   45/37/41/-2/0.02/0.0/000/00         33 ENE  VEC1 34 ENE RMY 37
4/6   62/37/50/+7/0.02/0.0/155/20         26 NW   VEC1 28 NNW RMY 29
4/7   58/36/47/+3/0.00/0.0/328/42         45 WNW  VEC1 48 WNW RMY 52
4/8   50/29/40/-4/0.00/0.0/767/98         26 NNW  VEC1 29 NNW RMY 31
4/9   54/33/44/0/0.00/0.0/770/98          25 S    VEC1 28 S   RMY 28
4/10  65/33/49/+4/0.00/0.0/772/98         18 WSW  VEC1 19 NW  RMY 20
4/11  75/45/60/+15/0.00/0.0/522/66        37 W    VEC1 37 W   RMY 38
4/12  73/56/65/+19/0.00/0.0/515/65        46 NW   VEC1 49 NW  RMY 52
4/13  88/52/70/+24/0.00/0.0/764/96        25 W    VEC1 26 WNW RMY 27
4/14  88/50/69/+22/0.00/0.0/711/89        24 WNW  VEC1 27 WNW RMY 26
4/15  68/45/57/+10/T/0.0/401/50           20 ENE  VEC1 20 ENE RMY 21
4/16  55/46/51/+4/0.05/0.0/000/00         21 NE   VEC1 22 NE  RMY 21
4/17  55/45/50/+2/0.06/0.0/000/00         17 NE   VEC1 18 ENE RMY 18
4/18  57/45/51/+3/T/0.0/…/..            39 WSW  VEC1 41 WSW RMY 42
4/19  49/37/43/-6/0.00/0.0/…/..         35 WNW  VEC1 36 WNW RMY 40
4/20  64/36/50/+1/0.00/0.0/…/..         23 NW   VEC1 23 NNW RMY 23
4/21  55/42/49/-1/0.00/0.0/…./..        22 E    VEC1 24 SE  RMY 24
4/22 53/42/48/-2/0.27/0.0/…./.. 28 ESE  VEC1 31 ESE RMY 30
4/23  51/45/48/-2/0.72/0.0/…/..         30 SE   VEC1 33 SE  RMY 31
4/24  58/43/51/+0/0.00/0.0/…/..         21 WNW  VEC1 22 WNW RMY 22

4/25  The low since midnight is 42F, the daily normal low is 42F

DAILY RECORDS

04/12/2023: NEW RECORD HIGH MINIMUM TEMPERATURE OF 56F,
THIS BEATS THE OLD RECORD OF 52F SET IN 1945 AND 1947

04/13/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 85F SET IN 1945

04/14/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 80F SET IN 1945

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

RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002
PEAK GUST 66 MPH SE IN 1968

RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996

TODAY’S REPORT PREPARED BY: Samantha Richard