Wednesday, June 24, 2026

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

WEDNESDAY, JUNE 24, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0408E
SUNSET:  1925E

SUNSHINE RETURNS TO GREAT BLUE HILL….

Sunshine returned for a mild day on the hill. Yesterday
afternoon was overcast with rain tapering off overnight.
We measured a storm total of 0.35 inches of liquid
precipitation.

Winds were light and variable yesterday afternoon with
a rare 6 hours of calm wind reading 0 miles per hour.
Wind from the WNW increased throughout the day with a
peak gust so far of 29MPH.

Humidity went down from 100% to 50% this increased the
visibility today from 50 miles to 60 miles by the 1pm
observation. Cloud cover was variable today with
scattered altocumulus and broken cirrus at 7am, clear
skies at 10am then increased with a layer of broken
cumulus in the afternoon.

Temperatures increased from yesterday and so far today
have been close to average. The maximum temperature so far
today is 79F degrees, which matches the normal high of 79F.
The minimum temperature since midnight is 59F degrees,
which is 1 degrees below the normal low of 60F.

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Today’s Observations:

7 A.M.
Weather: Scattered Altocumulus/  Altocumulus Castellanus
Temperature: 66F; Dew Point: 65F; Relative Humidity: 96%
Wind: NW @ 10 kts
Sea-level pressure: 1021.1 mb; 29.88 in. Hg: rising steadily
Visibility: 50 miles
6-hr Max temp: 67F
6-hr Min temp: 59F
24-hr Precip: 0.14 inches
BHO SA 1155 90 SCT E250 BKN 50 121/66/65/3210/988/ 8/082 52012 70014 10067 20059

10 A.M.
Weather: Clear, Few cumulus in all quadrants, few cirrus distant NNE-SE
Temperature: 75F; Dew Point: 62F; Relative Humidity: 62%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1012.2 mb; 29.89 in. Hg: falling then rising
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 50 122/75/62/3005/989/ FEW CU ALQDS FEW CI DSNT NNE-SE/ 8/202 53001

1 P.M.
Weather: Broken cumulus
Temperature: 79F; Dew Point: 57F; Relative Humidity: 50%
Wind: NW @ 12G23 kts
Sea-level pressure: 1012.0 mb; 29.88 in. Hg: steady then falling
Visibility: 60 miles
6-hr Max temp: 79F
6-hr Min temp: 57F
6-hr Precip: 0.00 inches
BHO SA 1755 E60 BKN 60 120/79/57/3012G23/988/ 8/200 58002 10079 20064

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SUMMARY FOR TUESDAY, JUNE 23, 2026

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..78
MIN…….62   NORMAL…..60
MEAN……65   NORMAL…..69

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-4
TOTAL DEPARTURE FOR THE MONTH……………………..+109 [+4.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH (JUN)……….17  DEPARTURE…….-45
TOTAL HEATING UNITS FOR THE SEASON………….6084  DEPARTURE……-122
TOTAL HEATING UNITS LAST SEASON TO DATE……..6206  DEPARTURE…….419

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE MONTH (JUN)………134  DEPARTURE…….+63
TOTAL COOLING UNITS FOR THE SEASON…………..193  DEPARTURE…….+94
TOTAL COOLING UNITS LAST SEASON TO DATE………129  DEPARTURE…….+64

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..28 S    @   00:43 A.M.
VECTOR #1 (1-Sec)……….28 S    @   01:43 A.M.
VECTOR #2 (1-Sec)……….30 S    @   01:50 A.M.
DAVIS #1……………….28 S    @   01:05 A.M.
DAVIS #2 ………………38 S    @   00:50 P.M.
RMY #1 (Instantaneous)…..28 S    @   00:09 A.M.
RMY #2 (Instantaneous)…..32 S    @   01:50 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……28 SSE  @   00:09 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 S    @   01:40 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 S    @   01:43 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 S    @   01:10 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 S    @   01:05 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 S    @   01:46 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SSE  @   00:09 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 SSE  @   00:10 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 S    @   01:06 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………5.8 NNW [140 total miles] VECTOR #1……………….7.4
VECTOR #2……………….7.6
DAVIS #1………………..6.5 SSW
DAVIS #2………………..6.7 SSW
RMY #1………………….6.2 NW
RMY #2………………….6.2 NW
RICHARDS (C5C)…………..7.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.14 DEPARTURE……0.00
TOTAL PRECIPITATION FOR THE MONTH (JUN)……..1.79 DEPARTURE…..-1.89
TOTAL PRECIPITATION FOR THE YEAR (2026)…….18.59 DEPARTURE…..-7.69

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PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

6/1  60/45/53/-9/T/606/67                26 ENE VEC1 27 ENE RMY 27
6/2  75/45/60/-2/0.00/680/75             22 NNW VEC1 22 NNW RMY 21
6/3  82/56/69/+7/0.00/880/97             28 S   VEC1 28 S   RMY 29
6/4  88/57/73/+10/0.00/817/90            23 WNW VEC1 23 SW  RMY 23
6/5  87/60/74/+11/0.00/810/89            20 NW  VEC1 19 NW  RMY 21
6/6  86/64/75/+12/0.09/282/31            46 WSW VEC1 45 WSW RMY 48
6/7  78/55/67/+3/0.26/446/49             38 NE  VEC1 38 NE  RMY 42
6/8  77/52/65/+1/0.00/904/99             20 SW  VEC1 20 SW  RMY 21
6/9  83/56/70/+6/0.00/886/97             28 W   VEC1 27 W   RMY 30
6/10 88/59/74/+9/0.00/686/75             30 SSW VEC1 30 SSW RMY 30
6/11 90/64/77/+12/0.10/631/69            22 WNW VEC1 22 WNW RMY 23
6/12 91/74/83/+18/0.00/412/45            21 WNW VEC1 21 WNW RMY 22
6/13 87/68/78/+12/0.00/769/84            36 NW  VEC1 36 NW  RMY 38
6/14 88/65/77/+11/0.00/495/54            33 SSW VEC1 32 SSW RMY 34
6/15 82/61/72/+6/0.00/577/63             28 SSW VEC1 28 SSW RMY 28
6/16 77/54/66/-1/0.00/898/98             22 W   VEC1 22 W   RMY 22
6/17 80/57/69/+2/0.00/697/76             25 SSW VEC1 24 SSW RMY 26
6/18 76/60/68/+1/0.64/193/21             51 S   VEC1 52 SSW RMY 54
6/19 78/60/69/+1/0.00/880/96             41 W   VEC1 40 W   RMY 41
6/20 77/60/69/+1/0.00/807/88             40 WNW VEC1 39 WNW RMY 40 TSTM
6/21 82/58/70/+2/0.00/…/..             24 WNW VEC1 24 NW  RMY 25
6/22 77/60/69/0/0.39/…/..              31 SSE VEC1 31 SSE RMY 31
6/23 68/62/65/-4/…./…/..             28 S   VEC1 28 S   RMY 28

6/24 The low since midnight is 59F, the daily normal low is 60F.

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JUNE DAILY RECORDS TO DATE

6/12 NEW RECORD HIGH MINIMUM TEMPERATURE OF 74F;
BEATING OLD RECORD OF 69F SET IN 1942 AND 2017

6/18 RECORD PEAK WIND GUST OF 51 MPH,
BEATING THE OLD RECORD OF 48e MPH SET IN 1943

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

RECORDS FOR JUNE 24
HIGH 99F IN 2025 [Record for month – Tied with 6/4/1919] LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010

RECORDS FOR JUNE 25
HIGH 93F IN 1943, 1980, 2005, 2025
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

TODAY’S REPORT PREPARED BY: Matt Douglas and Kaitlin Geagan