Weekly natural gas cash prices gained ground amid snow and freezing conditions that originated in the West and traveled across the northern half of the country, generating robust heating demand.

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NGI’s Weekly Spot Gas National Avg. for the Nov. 15-19 period climbed 18.5 cents to $4.875

A chilly weather system tracked out of the Mountain West at midweek, moved across the Midwest Thursday and over to the Northeast on Friday, delivering rain, snow and frosty temperatures, NatGasWeather said.

While most of the southern United States enjoyed mild temperatures and dry conditions, the early winter blast in the northern reaches of the country was enough to get furnaces cranking and spot prices rising in key regions for natural gas consumption at this time of year, the firm...