Property talk:P9496

Documentation

• Start a query
• Current uses
• Statistics by class
• Units
• Scale of values
• List of qualifiers
• Count

degrees day
thermal degree days value for a locality (integral of temperature above or below a reference during a time period)

Represents	degree day (Q1514559)
Data type	Quantity
Domain	geographic location (Q2221906)
Allowed units	Italian degree day (Q106651574)
Example	Rome (Q220) → 1,415 Italian degree day Bari (Q3519) → 1,185 Italian degree day Palermo (Q2656) → 751 Italian degree day Milan (Q490) → 2,404 Italian degree day
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P9496 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 5 Main statement 1 20% of uses Qualifier 4 80% of uses

[create Create a translatable help page (preferably in English) for this property to be included here]

Units: “Italian degree day (Q106651574)”: value unit must be one of listed. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9496#Units

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9496#Scope, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9496#Entity types

Type “geographic location (Q2221906)”: item must contain property “instance of (P31)” with classes “geographic location (Q2221906)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9496#Type Q2221906, SPARQL

Further details

Note that "degree day" isn't itself a unit, but rather a class of unit. Unfortunately, it seems that Wikidata currently doesn't have a constraint that limits to a certain class of units, so it is necessary to update the units constraint every time there's a new reckoning of degree days. Since Wikidata also doesn't yet support affine conversions, it's up to the end user to do any necessary conversions between units.