# HistoricalComparison An enum that represents a recognized comparison in the statistical analysis of a location’s historical weather data. ``` enum HistoricalComparison ``` ## Topics ### Enumeration Cases [`case highTemperature(Trend)`](/documentation/WeatherKit/HistoricalComparison/highTemperature(_:)) The comparison relates to the location’s maximum temperature averaged since ~1970. [`case lowTemperature(Trend)`](/documentation/WeatherKit/HistoricalComparison/lowTemperature(_:)) The comparison relates to the location’s minimum temperature averaged since ~1970. [`case precipitationAmount(Trend)`](/documentation/WeatherKit/HistoricalComparison/precipitationAmount(_:)) The comparison relates to the amount of precipitation at the location averaged over the past 30 days. [`case snowfallAmount(Trend)`](/documentation/WeatherKit/HistoricalComparison/snowfallAmount(_:)) The comparison relates to the amount of snowfall at the location averaged over the past 30 days. ## Relationships ### Conforms To [`Encodable`](/documentation/Swift/Encodable) [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`Decodable`](/documentation/Swift/Decodable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)