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National Weather Observers Day

Celebrated on 05/04/2026

Quick Fact

National Weather Observers Day, observed on May 4th, honors the thousands of volunteer weather observers who provide critical data for forecasts and warnings. The National Weather Service's Cooperative Observer Program (COOP) has been collecting data since 1890, with over 8,700 volunteers recording daily temperature and precipitation.

Origins and Establishment of National Weather Observers Day

National Weather Observers Day was established in 2015 by the National Weather Service (NWS) to recognize the invaluable contributions of volunteer weather observers. The date, May 4th, was chosen to coincide with the birthday of John Campanius Holm, a Lutheran minister who made some of the first recorded weather observations in the American colonies in the 1640s. The day aims to raise awareness about the importance of weather observation and the role of volunteers in collecting data that supports weather forecasting, climate monitoring, and emergency response.

Evolution and Modern Commemoration

Since its inception, National Weather Observers Day has grown in prominence, with the NWS and meteorological organizations promoting it through social media, educational events, and recognition ceremonies. Modern celebrations include workshops for observers, public outreach to recruit new volunteers, and special acknowledgments for long-serving observers. The day also highlights technological advancements, such as the integration of automated sensors with traditional manual observations, ensuring data continuity and accuracy. Today, weather observers range from farmers and teachers to retirees, all contributing to a vast network that underpins our understanding of weather and climate.

Facts & General Observations

• The Cooperative Observer Program (COOP) has over 8,700 active volunteers, some of whom have served for more than 50 years.
• Volunteer weather data is used in 40% of all NWS forecasts and warnings, making it a critical component of public safety.
• The oldest continuous weather observation record in the United States, dating back to 1820, was kept by volunteers in New Haven, Connecticut.

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