We built a weather-based grilling index to measure how outdoor cooking conditions on Memorial Day weekend have varied across the past decade — and what that means for beef demand
Memorial Day weekend is widely regarded as the unofficial start of grilling season in the United States — a moment when millions of Americans move cooking outdoors for the first time since the previous autumn. But ask anyone in the beef industry and they will tell you that not every Memorial Day is equal. Some years the weather cooperates; others, a late cold snap or a rainy long weekend quietly suppresses what should be the first big demand event of the summer.
To understand just how much that variation matters, we constructed a simple weather-based index drawing on eleven years of historical data across twelve major US metropolitan areas, weighted for both population size and climate sensitivity. The goal was straightforward: to put a consistent, comparable number on the nation’s collective propensity to grill outdoors on Memorial Day weekend, and to see how 2026 stacks up against the years before it.
The US National Grill Index is a population-weighted measure of outdoor grilling propensity across twelve major American metropolitan areas, designed to help the beef and food industries think about grilling demand on a national scale rather than city by city. By combining daily temperature, rainfall, and wind data with each city’s seasonal temperature range — and weighting the result by population and climate sensitivity — the index captures something that raw weather averages cannot: the fact that a warm spring weekend means far more to a Chicagoan or a Bostonian than it does to a Miamian. For high-swing cities in the northeast and midwest, where winters are harsh and the window of comfortable outdoor cooking is genuinely limited, a favourable weekend can represent a significant behavioural shift. Tracking this across every weekend of the year, and anchoring it to a landmark event like Memorial Day, gives the industry a consistent, comparable signal for when consumers are most likely to be firing up the grill.
It is important to note that the index is purely weather-driven and does not attempt to model the full picture of grilling demand. It takes no account of retail pricing dynamics — elevated beef prices, as seen consistently through 2024 and 2025, may suppress consumer willingness to grill regardless of how pleasant the weather is, and this dampening effect on demand is not reflected in the score. Equally, the index does not consider the substitution effect of poor weather on foodservice: when conditions discourage outdoor grilling, consumers do not simply stay home — many will eat out instead, potentially supporting restaurant traffic even in low-scoring weekends. The index is best understood as one input into a broader demand picture, capturing the weather-driven opportunity to grill rather than predicting actual purchase behaviour.
Written by Joe Muldowney
