• Early AM

    May 20

    Lo 63°

    A brief shower or two

    Dust & Dander Weather
    • Grass
      Pollen
      12 - Moderate
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      350 - High
    more

  • Today

    May 20

    83°Lo 63°

    Warmer; a stray p.m. t-storm

    Extreme indoor dust & dander levels
    • Grass
      Pollen
      12 - Moderate
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      350 - High
    more

  • Tue

    May 21

    89°Lo 64°

    A p.m. shower or t-storm

    Extreme indoor dust & dander levels
    • Grass
      Pollen
      12 - Moderate
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      350 - High

  • Wed

    May 22

    87°Lo 64°

    A thunderstorm in the area

    Extreme indoor dust & dander levels
    • Precip
      41%
    • Wind
      Speed
      5 mph
    • Cloud
      Cover
      70%
    more

  • Thu

    May 23

    82°Lo 65°

    A couple of thunderstorms

    Extreme indoor dust & dander levels
    • Precip
      62%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      79%
    more
Next Previous
Hi 89° RealFeel® 96° Precipitation 55%

Day

N

E

S

W

  • SW 4 mph
  • Gusts: 7 mph

Very warm and humid with clouds and sun; an afternoon and evening shower or thunderstorm

  • Max UV Index: 7 (High)
  • Thunderstorms: 60%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs
Lo 64° RealFeel® 63° Precipitation 55%

Night

N

E

S

W

  • N 3 mph
  • Gusts: 5 mph

A shower or thunderstorm around in the evening; otherwise, mostly cloudy

  • Max UV Index: N/A
  • Thunderstorms: 60%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Frederick Pollen Levels - May 21

  • Extreme
  • Very High
  • High
  • Moderate
  • Low

  • Grass

    Pollen

    Moderate

  • Weed

    Pollen

    Low

  • Tree

    Pollen

    High

  • Mold

    Pollen

    Low

Temperature History - May 21

more Historical Weather Data >
  Today Normal Record 5/21/2012
High 89° 78° N/A 70°
Low 64° 55° N/A 62°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:51 AM with 14:31 of sunlight, then sets at 8:22 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:34 PM with 11:18 of moolight, then sets at 3:52 AM

How Weather Impacts Seasonal Allergy Symptoms

May 18, 2013; 5:00 AM ET If you suffer with seasonal allergies, the weather can relieve or worsen your symptoms. Marja Martinez has the details.

Tue. Pollen

Tue. Dust & Dander

Tue. Wind Maps