I have lived in all three regions.

The US government doesn’t control California weather where we are clear to grow under full sun for 8 months in a year.

You are also wrong about Southern peach production vs California peach production. California produces the best and most of the peaches in the USA for fresh eating, varieties and also for canning. California produces five times more peaches than Georgia and South Carolina. NJ produces more peaches than the southern states. In CA, we do Ag well and have the best climate and soil. We are the number 1 Ag state in the USA with Ag income topping $45 billion. Why? Because we do Ag well...it’s unfair to strip away well earned meritocracy. You are wrong. You have no idea what you are talking about. Links below. I can’t get into a pissing match so you can bash CA Ag.

Amherst : https://weatherspark.com/y/25574/Average-Weather-in-Amherst-...

[..]Average Weather in Amherst Massachusetts, United States
In Amherst, the summers are warm and wet, the winters are freezing, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 17°F to 83°F and is rarely below 1°F or above 91°F.

The warm season lasts for 3.6 months, from May 28 to September 17, with an average daily high temperature above 73°F. The hottest day of the year is July 21, with an average high of 83°F and low of 63°F.

The cold season lasts for 3.3 months, from December 2 to March 12, with an average daily high temperature below 43°F. The coldest day of the year is January 30, with an average low of 17°F and high of 34°F.
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Fresno, CA: https://weatherspark.com/y/1482/Average-Weather-in-Fresno-Ca...

[..]In Fresno, the summers are sweltering, arid, and clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 39°F to 99°F and is rarely below 31°F or above 106°F.

The hot season lasts for 3.5 months, from June 6 to September 21, with an average daily high temperature above 90°F. The hottest day of the year is July 29, with an average high of 99°F and low of 68°F.

The cool season lasts for 3.1 months, from November 20 to February 22, with an average daily high temperature below 64°F. The coldest day of the year is December 30, with an average low of 39°F and high of 55°F.

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Also: South Carolina is more of a blueberry state than Peaches. Warm winters are compromising peach crop in Carolina and Georgia.

https://www.agmrc.org/commodities-products/fruits/peaches

[..]California clingstone peaches are available from July 10 to mid-September, while California freestone peaches are harvested from April 20 to October 10. The Southern states of Georgia and South Carolina provide peaches from May to August. For all other states the marketing season is from July to September.[..]

[..]As of 2017, peaches are commercially produced in 20 states. The top four states in peach production are California, South Carolina, Georgia and New Jersey.

In 2017, California supplied nearly 56 percent of the United States fresh peach crop and more than 96 percent of processed peaches (NASS, 2018).

United States total peach production in 2017 was 690,100 tons valued at $599 million. California led the nation in peach production, with 541,000 tons valued at $376.5 million. New Jersey followed, producing 28,200 tons valued at $44 million. Pennsylvania produced 21,400 tons valued at $25.3 million, and Washington produced 12,770 tons valued at $12.3 million (NASS, 2018).[..]