Market temperature is a qualitative label that summarises supply-demand dynamics in a real estate market. ZipMarketData computes market temperature for every ZIP code using three signals: days on market (DOM), active listings, and year-over-year price change.
The Three Temperature Zones
Multiple offers, prices above list, low inventory
Balanced, moderate competition
Buyers have leverage, price reductions common
Days on Market (DOM)
DOM is the single most powerful leading indicator of market conditions. It measures how long a typical listing sits before going under contract. Sub-21-day DOM means demand massively exceeds supply — expect bidding wars and sale prices above list. DOM above 60 days signals a buyer's market where negotiation room is wide.
Active Listings and Months of Supply
Months of supply = active listings / monthly closed sales. Under 3 months is a seller's market. Above 6 months favours buyers. ZipMarketData's /market-stats endpoint returns active listings counts, which you can combine with sales volume data to derive months of supply.
Why Temperature Matters for Investors
In a hot market, acquiring off-market or accepting lower initial yields may be necessary. In a cool market, you can negotiate seller concessions, price reductions, and extended due diligence periods. Temperature also affects exit strategy — flips work best in hot markets; buy-and-holds survive cool markets through cash flow.