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Tuesday, September 2, 2025

September 2, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, SEPTEMBER 2, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, SEPTEMBER 2, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0511E SUNSET:  1816E CLOUDS AND FOG EARLY THIS MORNING MELT AWAY TO PLENTY OF SUNSHINE…. We started the day with some low clouds and fog, which quickly moved out to reveal some mid level clouds which stuck around through mid morning. By late this morning and early this afternoon most of the clouds had dissipated leaving us with plenty of sun. Some diurnal cumulus clouds have popped now thanks to the surface heating. Temperatures are still quite pleasant for this time of year with reading reaching the mid to upper 70s by early this afternoon. This is just about where we should be for early September. The dew point continues to run in the comfortable range with values slipping a bit from the upper 50s to mid 50s. The wind has been on the light side again today, only averaging around 7mph for the day so far. What wind there is has been generally out of an easterly direction. The peak gust for the day so far is only 17mph, which occurred just after 12pm. Visibility is still decent today, generally holding at around 60 miles for the day. The maximum temperature so far today is 77F degrees, which is equal to the normal high of 77F. The minimum temperature since midnight is 58 degrees, which is 2 degrees below the normal low of 60F. ————————————————————– PRELIMINARY STATS FOR AUGUST 2025 TEMPERATURE, Deg. F Avg. Max. 79.5 [-0.7] Avg. Min. 59.3 [-3.3] Mean      69.4 [-2.0] 24-hour corrected mean: 68.5 Max. for month: 94F on the 11th Min. for month: 51F on the 20th HEATING DEGREE DAYS Total heating units:     19 [+008] Total for the season:    20 [+002] Total for last season:   11 COOLING DEGREE DAYS Total cooling units:    161 [-048] Total for the season:   672 [+076] Total for last season:  694 PRECIPITATION, Inches Total: 1.88 [-2.03] Greatest in 24 hrs: 0.68 on the 14th SNOWFALL, Inches Total: 0.0 [ 0.0] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed:  8.8 mph Avg. corrected wind speed:    9.5 mph Prevailing wind direction:   South-southwest [15%] Peak gust and direction:  41 NE on the 17th SUNSHINE: Campbell-Stokes card minutes: 18302 of a possible 22780, or 74% Astronomical total minutes: 18979 of a possible 25724 or 74% ————————————————————– Today’s Observations: 7 A.M. Weather: Scattered altocumulus, stratus layer ENE-SSW Temperature: 62F; Dew Point: 58F; Relative Humidity: 85% Wind: NNE @ 6 kts, wind light Sea-level pressure: 1023.8 mb; 30.23 in. Hg: falling, then rising Visibility: 60 miles 6-hr Max temp: 62F 6-hr Min temp: 58F 24-hr Precip: 0.00 inches BHO SA 1155 150 SCT 60 238/62/58/0306/023/ ST LYR ENE-SSW VSBY 8 ENE-SSE 15 S-SSW WND LGT/ 8/650 55000 10062 20058 10 A.M. Weather: Clear, few cumulus distant W-NNE and distant ESE-SSW, few altocumulus/castellanus distant N-SE and distant SSW-WSW Temperature: 71F; Dew Point: 55F; Relative Humidity: 56% Wind: E @ 5 kts, wind light Sea-level pressure: 1023.2 mb; 30.22 in. Hg: falling unsteadily Visibility: 60 miles 3-hr Precip: 0.00 inches BHO SA 1455 CLR 60 232/71/55/0905/002/ FEW CU DSNT W-NNE AND DSNT ESE-SSW FEW AC/ACC DSNT N-SE AND DSNT SSW-WSW WND LGT/ 8/280 57006 1 P.M. Weather: Scattered cumulus, scattered cirrus Temperature: 76F Dew Point: 56F; Relative Humidity: 50% Wind: E @ 6 kts, wind light Sea-level pressure: 1021.6 mb; 30.17 in. Hg: falling, then more rapidly Visibility: 60 miles 6-hr Max temp: 77F 6-hr Min temp: 62F 6-hr Precip: 0.00 inches BHO SA 1755 40 SCT 250 SCT 60 216/76/56/0906/017/ WND LGT/ 8/201 58016 10077 20062 ————————————————————– SUMMARY FOR MONDAY, SEPTEMBER 1, 2025 TEMPERATURE (DEGREES F) MAX…….73   NORMAL…..78 MIN…….55   NORMAL…..60 MEAN……64   NORMAL…..69 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5 TOTAL DEPARTURE FOR THE MONTH……………………….-5 [-5.2 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..1  DEPARTURE………0 TOTAL HEATING UNITS FOR THE MONTH……………..1  DEPARTURE………0 TOTAL HEATING UNITS FOR THE SEASON……………21  DEPARTURE……..+2 TOTAL HEATING UNITS LAST SEASON TO DATE……….11  DEPARTURE…….+10 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-5 TOTAL COOLING UNITS FOR THE MONTH……………..0  DEPARTURE……..-5 TOTAL COOLING UNITS FOR THE SEASON…………..672  DEPARTURE…….+71 TOTAL COOLING UNITS LAST SEASON TO DATE………704  DEPARTURE…….-32 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 F420C (Official)………..23 NE   @   09:29 A.M. VECTOR #1 (1-Sec)……….23 ENE  @   09:47 A.M. VECTOR #2 (1-Sec)……….24 NE   @   09:22 A.M. DAVIS #1……………….22 NE   @   09:29 A.M. DAVIS #2 ………………21 E    @   09:44 A.M. RMY #1 (Instantaneous)…..23 NE   @   09:29 A.M. RMY #2 (Instantaneous)…..23 NE   @   09:29 A.M. MERLIN…………………21 ENE RICHARDS (C5C) (Inst)……21 NE   @   09:29 A.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………14 NNE  @   06:51 A.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NE   @   09:31 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 NE   @   09:31 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 ENE  @   09:31 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 ENE  @   09:45 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NE   @   09:31 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 ENE  @   09:44 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 NE   @   09:31 A.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………7.9 ENE [189 total miles] VECTOR #1……………….8.1 VECTOR #2……………….8.6 DAVIS #1………………..8.4 NE DAVIS #2………………..8.3 ENE RMY #1………………….8.1 NE RMY #2………………….8.5 NE RICHARDS (C5C)…………..8.5 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11 TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.11 TOTAL PRECIPITATION FOR THE YEAR (2025)…….31.33 DEPARTURE…..-3.39 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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 8/1   71/57/64/-9/0.44/546/63            28 NE  VEC1 28 NE  RMY 27 8/2   75/54/65/-8/0.00/838/97            18 NNW VEC1 18 NNW RMY 18 8/3   83/59/71/-2/0.00/784/91            21 SSW VEC1 21 SSW RMY 21 8/4   84/61/73/0/0.00/757/88             17 W   VEC1 17 W   RMY 17 8/5   73/62/68/-5/0.00/480/56            28 NE  VEC1 27 NE  RMY 28 8/6   77/61/69/-4/0.00/248/29            17 ENE VEC1 17 ENE RMY 16 8/7   81/61/71/-2/0.00/665/78            18 ESE VEC1 18 ESE RMY 17 8/8   83/61/72/0/0.00/834/98             21 SSW VEC1 21 SSW RMY 21 8/9   83/60/72/0/0.00/814/96             22 S   VEC1 22 SSW RMY 22 8/10  89/61/75/+3/0.00/761/90            22 S   VEC1 22 S   RMY 21 8/11  94/67/81/+9/0.00/792/94            20 W   VEC1 19 W   RMY 19 8/12  93/68/81/+9/0.00/806/96            21 SSW VEC1 21 SSW RMY 21 8/13  88/66/77/+5/0.00/344/41            25 SW  VEC1 25 SW  RMY 25 8/14  90/68/79/+7/0.68/426/51            35 NE  VEC1 34 NE  RMY 36 TSTM 8/15  75/63/69/-3/0.00/783/96            29 NE  VEC1 29 ENE RMY 31 8/16  86/62/74/+2/0.00/730/88            23 S   VEC1 24 S   RMY 23 8/17  89/64/77/+5/0.19/414/50            41 NE  VEC1 43 NE  RMY 42 TSTM 8/18  68/55/62/-9/0.00/627/76            32 NE  VEC1 34 NE  RMY 34 8/19  73/54/64/-7/0.00/560/68            20 SE  VEC1 19 SE  RMY 18 8/20  63/51/57-14/0.51/008/01            22 ENE VEC1 22 ENE RMY 21 8/21  67/54/61/-10/T/303/37              36 ENE VEC1 35 NE  RMY 36 8/22  79/53/66/-5/0.00/774/95            24 N   VEC1 25 N   RMY 25 8/23  85/60/73/+2/0.00/771/95            33 SSW VEC1 33 SSW RMY 35 8/24  80/60/70/-1/0.00/632/78            33 SSW VEC1 35 SSW RMY 34 8/25  83/63/73/+3/T/533/66               23 WSW VEC1 22 SW  RMY 23 8/26  77/59/68/-2/0.00/765/95            28 WNW VEC1 27 WNW RMY 28 8/27  75/57/66/-4/T/634/79               26 WNW VEC1 26 NW  RMY 27 8/28  77/52/65/-5/T/711/89               31 SSW VEC1 31 SSW RMY 31 8/29  73/59/66/-4/0.06/191/24            29 SSE VEC1 29 SSE RMY 29 8/30  75/52/64/-5/0.00/658/83            21 W   VEC1 21 W   RMY 22 8/31  75/53/64/-5/0.00/790/100           17 N   VEC1 18 NNW RMY 17 ————————————————————– AUGUST DAILY RECORDS TO DATE NONE. ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/1   73/55/64/-5/0.00/…/..            23 NE  VEC1 23 ENE RMY 23 9/2 The low since midnight is 58F, the daily normal low is 60F. ————————————————————– SEPTEMBER DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR SEPTEMBER 2 HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD) LOW 44F IN 1909 PRECIP 2.73 INCHES IN 1947 PEAK GUST 55e MPH WNW IN 1944 RECORDS FOR SEPTEMBER 3 HIGH 95F IN 1929 LOW 43F IN 1893 PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE) PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE) TODAY’S REPORT PREPARED BY: Matt Douglas
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
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  • Incorporate the data into any commercial product, software, application, or service
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§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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