PA · Allergy Season Guide
Philadelphia Allergy Season Guide
PollyMap is actively seeking a qualified local collection partner in Philadelphia. This guide uses regional climate and historical allergen data while we recruit a local host.
PollyMap is actively looking for a qualified local partner in Philadelphia.
We're recruiting a qualified local allergy clinic, naturopathic clinic, university, environmental health professional, or other qualified organization to become the official pollen collection partner for Philadelphia.
Become the Official PollyMap Partner for PhiladelphiaSummary
PollyMap does not yet have weekly collected pollen data for Philadelphia. This guide is based on regional climate patterns and historical allergen data while we recruit a local collection partner. Tree pollen peaks in spring, grass pollen in late spring and early summer, and weed pollen in late summer and fall.
Local allergy guide for Philadelphia
Philadelphia shares Pennsylvania's a humid continental climate with four distinct seasons — cold, snowy winters and warm, humid summers. at 39 ft elevation.
Philadelphia at 39 ft elevation sits within Pennsylvania's broader regional climate.
In Philadelphia, tree pollen — including Birch, Oak, Maple — typically dominates from late winter through spring. Timothy grass is the most common warm-season pollinator, and Ragweed drives the largest fall pollen load.
Philadelphia's local mold profile includes Alternaria, Cladosporium, Aspergillus. Spore counts tend to peak after rainfall and during the warm, humid portion of the year.
Local weather — temperature, rainfall, wind, and humidity — drives day-to-day pollen levels. Dry, windy days following warm weather typically produce the highest counts, while heavy rain temporarily clears the air.
Philadelphia monthly allergy calendar
Typical month-by-month intensity for the four major airborne allergen categories in Philadelphia.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | Low | Mod | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low |
| Grass | — | — | Low | Mod | V.High | V.High | High | Mod | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Low | Mod | Mod | High | High | High | V.High | V.High | V.High | Mod | Low |
Most common local pollens — weeds
Most common airborne molds
Current PollyMap data for Philadelphia
Official PollyMap Partner in Philadelphia
Frequently asked questions about allergies in Philadelphia
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Related guides
State Guide
Pennsylvania Allergy Season Guide
Nearby city
Pittsburgh Allergy Season Guide
Nearby city
Allentown Allergy Season Guide
Nearby city
Reading Allergy Season Guide
Nearby city
Erie Allergy Season Guide
Library
Pollen species library
Library
Mold species library
Reports
Latest PollyMap reports
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