National on-time performance scores for the delivery of first-class mail hit all-time highs during the months of April, May and June this year. The rates are based on the time it takes from depositing the mail into a collection box or lobby mail chute to its delivery at a home or business.

On-time rates for overnight mail climbed one percentage point from the same period last year to 97%, the highest performance score ever recorded at the Postal Service. It also reported higher on-time rates for its two-day and three-day delivery services.

The Postal Service says 13 of the its 80 districts had a 98% on-time score for overnight delivery, including Montana. The Postal Service contracts with IBM Global Business Services to measure on-time rates for first-class mail.