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Tuesday, September 9, 2025

September 9, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, SEPTEMBER 9, 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 9, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0518E SUNSET:  1804E MORE SUNSHINE THAN YESTERDAY; BRISK AND COOL WITH AN ONSHORE WIND…. Today has featured much more sunshine than yesterday. A period of low ocean clouds did move through during the mid to late morning period, but they have since dissipated for the most part. Temperatures are once again below normal today as readings have only reached 70F so far. Normal highs should be in the mid 70s at this time of year. Dew point values, which dropped into the mid 30s for about an hour during the wee hours as we briefly ended up below the inversion, has otherwise been mainly in the low to mid 50s today. Either way, very comfortable air is in place. The wind started the day on the light side, but increased during the morning as high pressure crested to our north. A generally northeast flow has been averaging at around 8mph for the day so far. The peak gust for the day is 21mph, which around 11:45am this morning. Visibility has been quite decent today, ranging from around 50 miles early this morning up to around 70 miles by early this afternoon. The maximum temperature so far today is 70F degrees, which is 6 degrees below the normal high of 76F. The minimum temperature since midnight is 53F degrees, which is 5 degrees below the normal low of 58F. ————————————————————– Today’s Observations: 7 A.M. Weather: Scattered cirrus, few stratocumulus distant SSE-S Temperature: 56F; Dew Point: 52F; Relative Humidity: 86% Wind: NE @ 12 kts Sea-level pressure: 1029.6 mb; 30.40 in. Hg: rising, then more slowly Visibility: 50 miles 6-hr Max temp: 58F 6-hr Min temp: 53F 24-hr Precip: 0.00 inches BHO SA 1155 250 SCT 50 296/56/52/0412/040/ FEW SC DSNT SSE-S PTCHY GF ALQDS/ 8/501 51016 10058 20053 10 A.M. Weather: Broken stratocumulus, broken cirrus Temperature: 66F; Dew Point: 53F; Relative Humidity: 64% Wind: E @ 8G15 kts Sea-level pressure: 1029.9 mb; 30.41 in. Hg: rising, then more slowly Visibility: 60 miles 3-hr Precip: 0.00 inches BHO SA 1455 E30 BKN 250 BKN 60 299/66/53/0808G15/041/ 8/501 51003 1 P.M. Weather: Scattered cirrus, few stratocumulus all quadrants Temperature: 69F Dew Point: 51F; Relative Humidity: 53% Wind: E @ 11G16 kts Sea-level pressure: 1029.1 mb; 30.39 in. Hg: steady, then falling Visibility: 70 miles 6-hr Max temp: 70F 6-hr Min temp: 56F 6-hr Precip: 0.00 inches BHO SA 1755 250 SCT 70 291/69/51/0811G16/039/ FEW SC ALQDS/ 8/501 58008 10070 20056 ————————————————————– SUMMARY FOR MONDAY, SEPTEMBER 8, 2025 TEMPERATURE (DEGREES F) MAX…….68   NORMAL…..76 MIN…….49   NORMAL…..58 MEAN……59   NORMAL…..67 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-8 TOTAL DEPARTURE FOR THE MONTH……………………….-9 [-1.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..6  DEPARTURE……..+4 TOTAL HEATING UNITS FOR THE MONTH…………….12  DEPARTURE……..+2 TOTAL HEATING UNITS FOR THE SEASON……………32  DEPARTURE……..+4 TOTAL HEATING UNITS LAST SEASON TO DATE……….19  DEPARTURE…….+13 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-4 TOTAL COOLING UNITS FOR THE MONTH…………….27  DEPARTURE……..-6 TOTAL COOLING UNITS FOR THE SEASON…………..699  DEPARTURE…….+70 TOTAL COOLING UNITS LAST SEASON TO DATE………716  DEPARTURE…….-17 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)………..21 NW   @   03:31 A.M. VECTOR #1 (1-Sec)……….21 NW   @   03:31 A.M. VECTOR #2 (1-Sec)……….21 NW   @   03:31 A.M. DAVIS #1……………….21 NW   @   03:31 A.M. DAVIS #2 ………………21 WNW  @   12:28 A.M. RMY #1 (Instantaneous)…..24 NW   @   03:31 A.M. RMY #2 (Instantaneous)…..23 WNW  @   01:29 A.M. MERLIN…………………19 NW RICHARDS (C5C) (Inst)……22 NW   @   03:31 A.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………15 NW   @   03:34 A.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NW   @   03:33 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 NW   @   12:29 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NW   @   03:33 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NW   @   12:29 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 NW   @   03:33 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 NW   @   12:29 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 NW   @   03:33 A.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………7.3 NW [174 total miles] VECTOR #1……………….7.9 VECTOR #2……………….8.2 DAVIS #1………………..7.6 NW DAVIS #2………………..7.4 NNW RMY #1………………….7.6 NW RMY #2………………….8.0 NW RICHARDS (C5C)…………..8.2 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11 TOTAL PRECIPITATION FOR THE MONTH…………..2.14 DEPARTURE…..+1.20 TOTAL PRECIPITATION FOR THE YEAR (2025)…….33.47 DEPARTURE…..-2.08 ————————————————————– 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/-5/0.00/221/28            23 NE  VEC1 23 ENE RMY 23 9/2   77/58/68/-1/0.00/714/91            18 ESE VEC1 19 ESE RMY 18 9/3   78/57/68/0/0.00/719/92             21 SSW VEC1 21 SSW RMY 21 9/4   81/56/69/+1/0.00/…/..            26 SSW VEC1 27 SSW RMY 28 9/5   82/63/73/+5/0.12/…/..            30 SSW VEC1 31 SSW RMY 33 9/6   84/64/74/+6/1.05/…/..            55 W   VEC1 55 W   RMY 57 TSTM 9/7   64/56/60/-7/0.97/…/..            16 WNW VEC1 16 NNE RMY 15 9/8   68/49/59/-8/0.00/…/..            21 NW  VEC1 21 NW  RMY 24 9/9 The low since midnight is 53F, the daily normal low is 58F. ————————————————————– 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 9 HIGH 92F IN 2015 LOW 41F IN 1938 PRECIP 1.97 INCHES IN 1969 PEAK GUST 52 MPH WNW IN 1969, NW IN 1978 RECORDS FOR SEPTEMBER 10 HIGH 90F IN 1931,1989 LOW 41F IN 1956 PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER) PEAK GUST 48 MPH NW IN 1972 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
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 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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