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Tuesday, July 22, 2025

July 22, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, JULY 22, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, JULY 22, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0427E SUNSET:  1914E A SPECTACULAR JULY DAY WITH A CRISP CLEAR AIR MASS IN PLACE…. What a treat today! Sunshine has been in control most of the day, however high thin cirrus clouds are overspreading the area this afternoon as the high pressure that crested over the region this morning begins to move off to the east. The cirrus represents the leading edge of a warmer air mass heading for us for the rest of the week. Temperatures today have again been below normal levels for this time of year with readings in the upper 70s. The real treat is the dew point which has dropped a bit from the mid 50s to around 50 early this afternoon, making the air feel quite refreshing. The wind has been fairly light today, even going calm for a time this morning as the high was directly overhead. The average speed for the day so far is around 7mph. The peak gust so far is 18mph, which occurred just after 12:30pm. Visibility has been exceptional, especially for this time of year. The view has been holding at around 80 miles all day! The maximum temperature so far today is 77F degrees, which is 5 degrees below the normal high of 82F. The minimum temperature since midnight is 55F degrees, which is 9 degrees below the normal low of 64F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few cumulus offshore distant ESE, few altocumulus distant SW-W, few cirrus distant ESE-S-WSW Temperature: 62F; Dew Point: 54F; Relative Humidity: 74% Wind: NNW @ 5 kts, wind light Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising unsteadily Visibility: 80 miles 6-hr Max temp: 62F 6-hr Min temp: 55F 24-hr Precip:  0.00 inches BHO SA 1155 CLR 80 217/62/54/3305/017/ FEW CU OFFSHR DSNT ESE FEW AC DSNT SW-W FEW CI DSNT ESE-S-WSW WND LGT/ 8/251 52017 10062 20055 10 A.M. Weather: Clear, few cumulus all quadrants, few cirrus distant SE-SSW and distant WSW-WNW Temperature: 71F; Dew Point: 51F; Relative Humidity: 49% Wind: Calm Sea-level pressure: 1022.2 mb; 30.19 in. Hg: rising, then steady Visibility: 80 miles 3-hr Precip: 0.00 inches BHO SA 1455 CLR 80 222/71/51/0000/019/ FEW CU ALQDS FEW CI DSNT SE-SSW AND DSNT WSW-WNW WND CALM/ 8/201 51005 1 P.M. Weather: Thin scattered cirrus, few cumulus all quadrants Temperature: 76F Dew Point: 50F; Relative Humidity: 41% Wind: NW @ 7 kts Sea-level pressure: 1021.5 mb; 30.16 in. Hg: falling, then more slowly Visibility: 80 miles 6-hr Max temp: 77F 6-hr Min temp: 62F 6-hr Precip:  0.00 inches BHO SA 1755 E250 -SCT 80 215/76/50/3207/016/ FEW CU ALQDS/ 8/204 56007 10077 20062 ————————————————————– SUMMARY FOR MONDAY, JULY 21, 2025 TEMPERATURE (DEGREES F) MAX…….78   NORMAL…..82 MIN…….61   NORMAL…..64 MEAN……70   NORMAL…..73 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-3 TOTAL DEPARTURE FOR THE MONTH………………………+53 [+2.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL HEATING UNITS FOR THE MONTH……………..1  DEPARTURE……..-4 TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-4 TOTAL HEATING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+1 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..5  DEPARTURE……..-4 TOTAL COOLING UNITS FOR THE MONTH……………212  DEPARTURE…….+48 TOTAL COOLING UNITS FOR THE SEASON…………..412  DEPARTURE……+109 TOTAL COOLING UNITS LAST SEASON TO DATE………425  DEPARTURE…….-13 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)……….E31 NNW  @   12:02 P.M. VECTOR #1 (1-Sec)……….31 NNW  @   12:02 P.M. VECTOR #2 (1-Sec)……….32 NNW  @   12:02 P.M. DAVIS #1……………….29 NNW  @   12:03 P.M. DAVIS #2 ………………28 NNW  @   12:02 P.M. RMY #1 (Instantaneous)…..33 NNW  @   12:02 P.M. RMY #2 (Instantaneous)…..32 NNW  @   12:02 P.M. MERLIN…………………28 NW RICHARDS (C5C) (Inst)…..OTS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………22 NNW  @   12:03 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22      @   12:03 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22      @   12:03 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 NW   @   12:03 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NNW  @   12:04 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 NNW  @   12:03 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 NNW  @   12:03 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..11.1 NNW [267 total miles] VECTOR #1………………11.2 VECTOR #2………………11.3 DAVIS #1……………….11.3 NNW DAVIS #2………………….M RMY #1…………………10.9 NNW RMY #2…………………11.1 NNW RICHARDS (C5C)…………..OTS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11 TOTAL PRECIPITATION FOR THE MONTH…………..5.61 DEPARTURE…..+3.28 TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.84 DEPARTURE…..-0.72 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR JULY 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 7/1   90/68/79/+8/0.14/411/45           38 W   VEC1 38 W   RMY 41 TSTM 7/2   85/69/77/+6/0.02/247/27           23 WSW VEC1 24 WSW RMY 24 7/3   88/63/76/+4/0.03/748/82           39 SW  VEC1 39 SW  RMY 40 TSTM 7/4   80/60/70/-2/0.00/875/96           28 NNW VEC1 27 NNW RMY 29 7/5   83/61/72/0/0.00/664/73            23 W   VEC1 23 W   RMY 24 7/6   92/65/79/+7/0.00/818/90           29 SW  VEC1 29 SW  RMY 29 7/7   88/69/79/+7/0.01/490/54           28 SSW VEC1 28 SSW RMY 29 TSTM 7/8   94/67/81/+9/0.36/562/62           24 WSW VEC1 24 WSW RMY 27 TSTM 7/9   74/65/70/-3/0.73/172/19           26 SW  VEC1 27 SW  RMY 28 TSTM 7/10  66/61/64/-9/3.85/000/00           24 ENE VEC1 24 ENE RMY 24 TSTM 7/11  80/62/71/-2/0.00/190/21           18 SSW VEC1 18 SSW RMY 18 7/12  84/65/75/+2/0.00/505/56           20 S   VEC1 20 S   RMY 19 7/13  85/63/74/+1/0.00/505/56           21 SSW VEC1 21 SSW RMY 21 7/14  81/65/73/0/T/216/24               23 SW  VEC1 23 SW  RMY 25 7/15  90/71/81/+8/0.06/665/74           24 SSW VEC1 24 SSW RMY 24 7/16  93/71/82/+9/0.00/690/77           24 SSW VEC1 24 SSW RMY 23 7/17  89/73/81/+8/0.00/…/..           41 WNW VEC1 41 WNW RMY 42 7/18  81/67/74/+1/0.00/…/..           36 WNW VEC1 36 WNW RMY 37 7/19  84/62/73/0/0.00/…/..            23 SW  VEC1 22 SW  RMY 21 7/20  85/65/75/+2/0.41/…/..           31 NW  VEC1 31 NW  RMY 31 TSTM 7/21  78/61/70/-3/0.00/…/..           31 NNW VEC1 31 NNW RMY 33 7/22 The low since midnight is 55F, the daily normal low is 64F. ————————————————————– JULY DAILY RECORDS TO DATE 7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES; BEATING OLD RECORD OF 1.95 INCHES SET IN 2015 7/16 TIED RECORD HIGH MINIMUM TEMPERATURE OF 71F; ALSO SET IN 1901, 1958, 1968, 2013, AND 2023 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR JULY 22 HIGH 99F IN 1926, 2011 LOW 52F IN 1890 PRECIP 1.73 INS IN 1887 PEAK GUST 55 MPH IN 1983 RECORDS FOR JULY 23 HIGH 99F IN 1952 LOW 51F IN 1923,1977 PRECIP 1.82 INS IN 1953 PEAK GUST 54e MPH S IN 1946 TODAY’S REPORT PREPARED BY: MFD/JN
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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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