A campaign can do everything right on paper and still underperform. The audience is correctly defined and the impressions are delivered, but what those metrics can't tell you is whether the message arrived on a day when it had any particular reason to resonate.
For an atopic dermatitis brand running a Q1 2026 campaign, that question mattered more than usual. The category was weather-sensitive: symptoms flare when weather conditions shift, patients call their doctors, and prescribing follows within days. Demand wasn't spread evenly across the quarter or across the country. It concentrated in whichever ZIP codes were experiencing the relevant conditions at the time, and a media buy planned in advance has no way to see low humidity in one metro, dryness in another, or extreme cold somewhere else.
So the team tried something sharper and additive. Rather than replacing the existing audience strategy, they layered Weather Targeting on top of it, using segments from The Weather Company that refresh every 15 minutes at the ZIP code level. The campaign strategy leveraged targeting segments for cold and dry conditions, alongside The Weather Company’s curated eczema symptoms segment. When it comes to data, precision is imperative, and The Weather Company is the world’s most accurate forecaster. The logic was simple. Keep targeting the same qualified HCPs, but allocate additional impressions into the ZIP codes actively experiencing the conditions that drive symptomatic patients into exam rooms. When the trigger fired, share of voice went up. When conditions passed, spend moved elsewhere.
The results, measured against Rx data through mid-April, are what make the case worth telling.
The analysis compared HCPs who received standard impressions only to those who also received additional Weather Targeting impressions. The control group produced a New Patient Start rate of 14%. The group with added Weather Targeting produced a New Patient Start rate of 24%. That’s about a 70% lift in performance, from the same brand and the same creative. The only meaningful difference was when the impressions landed.
These are preliminary results from a single campaign with an early Rx read, and the two groups weren't randomized. But the direction points at something that applies well beyond one brand: physical environments drive consumer actions, creating a clear opportunity for proactive targeting.
Both current and forecasted weather data offer a live, external, ZIP-level read on when a patient population has a propensity to be symptomatic and when a physician is likely to be writing. Pollen, temperature swings, UV, precipitation, barometric pressure, and predictive illness-risk models all give a campaign a reason to lean in on a particular day in a particular place.
The encouraging part is how seamless Weather Targeting has become. The data is live, the segments are ready to activate inside an ad group, and the layer sits on top of a media plan a team has already built rather than asking them to start over. Atopic dermatitis is one category of many. Migraine, asthma, allergy, arthritis, flu, any condition whose symptoms track with conditions on the ground gives a campaign the same reason to lean in.
As more live, external inputs become targetable in the same way, campaigns get to show up precisely when the audience is ready for them.
