---
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caption: 'This graph shows the number of days by which the start of spring in each year differs from the average start of spring during the 20th century. The spring of 2012 (circled) set a record for earliest start. (Source: Adapted from the USGCRP indicators pilot, with data from USA-NPN and NOAA NCDC)'
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description: 'This graph shows the number of days by which the start of spring in each year differs from the average start of spring during the 20th century. The spring of 2012 (circled) set a record for earliest start. (Source: Adapted from the USGCRP indicators pilot, with data from USA-NPN and NOAA NCDC)'
display_name: '2.4: Annual Start of Spring for the Contiguous United States'
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    description: 'This graph shows the number of days by which the start of spring in each year differs from the average start of spring during the 20th century. The spring of 2012 (circled) set a record for earliest start. (Source: Adapted from the USGCRP indicators pilot, with data from USA-NPN and NOAA NCDC)'
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    title: Annual Start of Spring for the Contiguous United States
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source_citation: 'Adapted from Start of Spring, USGCRP indicators pilot'
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title: Annual Start of Spring for the Contiguous United States
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