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Rosslyn Farms, Pennsylvania Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Rosslyn Farms weather forecast — hour by hour, 7-day outlook, NOAA radar

Rosslyn Farms, PA
Saturday, July 4 at 8:31 AM
77
°
Clear
Feels like
81°
Humidity
65%
Wind
3 mph
Sunrise
1:55 AM
Sunset
4:53 PM
Rosslyn Farms, PA
Hour by hour · 24h
24-Hour ForecastRosslyn Farms, PA: 24-hour forecast. Temperatures range from 71 to 96 degrees Fahrenheit with a 36% chance of precipitation at 6 PM.
L 71°H 96°
Rosslyn Farms, PA
7-day forecast
  1. Today
    Jul 4
    Heavy Showers
    36%
    0.78″
    96°70°—
  2. Sunday
    Jul 5
    Showers
    79%
    0.10″
    88°71°-8°
  3. Monday
    Jul 6
    Thunderstorm
    69%
    0.09″
    81°67°-7°
  4. Tuesday
    Jul 7
    Overcast
    35%
    —
    85°65°+4°
  5. Wednesday
    Jul 8
    Overcast
    10%
    —
    88°62°+3°
  6. Thursday
    Jul 9
    Light Drizzle
    50%
    0.01″
    90°69°+2°
  7. Friday
    Jul 10
    Heavy Drizzle
    54%
    —
    81°67°-9°
Rosslyn Farms, PA
Next 24 hours · Mild now
HOT 90°65°85°105°6a12p6p12anow 75°high 96°low 71°PRECIP %
Rosslyn Farms, PA
Anemometer · 24h winds · from true
NESW
From · True
SSW
193° · backing 69°
Direction
SSW
193°
Sustained
3
mph
Gust
9
mph
Peak 24h
24
avg 6
Beaufort · 1 · LIGHT AIR
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 6 · pk 24 @ 10:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 271SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 69° from the ssw.
Rosslyn Farms, PA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
978.7
+0.7 mb in 3h · rising · 28.90 inHg
Now
978.7
mb
3h
+0.7
mb
12h
+0.2
mb
24h
-2.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 978–981
970975980985990-21h-18h-15h-12h-9h-6h-3h-24hNOW981.4977.7978.6
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Rosslyn Farms, PA
Air quality
59
AQI
Moderate
→+1 in 6h▲Peak ~76 @ 7 PM

AQI 59 (Moderate), driven by PM2.5. AQI projected to climb to 76 over the next 6 hours. PM2.5 at 22.9 µg/m³ (AQI 77) with a 0.99 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.

PM 2.5DRIVERModerate
22.9μg/m³
PM 10Good
23μg/m³
NO₂Good
15μg/m³
OzoneModerate
80μg/m³
UV IndexLow
1.1

What's driving it

Ozone × UV × Sky

Ozone at AQI 38 now. With UV 3.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 13 around 1 PM.

Present
AQI 38
UV peak
3.7 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 13

PM × Wind × Precip

PM2.5 at 22.9 µg/m³ (AQI 77) with a 0.99 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.99
Wind
calm
Recent rain
0h in last 6h
Pattern
stagnant smoke

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³420
Rosslyn Farms, PA
Sky cover · visibility · 24h
Cloud cover
1%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
43.6mi
UNLIMITED
83 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
12:31 UTC · Rosslyn Farms, PA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
12:31 UTC · Rosslyn Farms, PA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Rosslyn Farms, PA
Satellite · infrared · animated
Rosslyn Farms, PA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Rosslyn Farms, PA
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:23 AM
Sunrise
1:55 AM
Daylight
14h 58m
Sunset
4:53 PM
Civil dusk
9:28 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Rosslyn Farms, PA
The moon
Waning Gibbous
82% illuminated
Moonrise
11:15 PM
Moonset
10:24 AM
In sign
♓︎ Pisces
Rosslyn Farms, PA
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Rosslyn Farms at a glance

  • Today vs. normal: 6°F above the seasonal normal for this latitude
  • Last frost: April 19 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Rosslyn Farms

  1. Sat95°70°36%
  2. Sun88°71°79%
  3. Mon81°67°69%
  4. Tue85°65°35%
  5. Wed88°62°10%
  6. Thu90°69°50%
  7. Fri81°67°54%
  8. Sat86°67°38%
  9. Sun82°64°30%
  10. Mon74°60°15%
  11. Tue79°61°15%
  12. Wed86°66°27%
  13. Thu91°70°19%
  14. Fri93°72°45%
  15. Sat85°69°35%
  16. Sun88°67°35%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Rosslyn Farms

SPC has placed Rosslyn Farms in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

Rosslyn Farms's warmest month is July (~73°F mean) and its coldest is January (~28°F). Rainfall peaks in May (5.4 inches) and bottoms out in February (3.1 inches).

MonthMean tempPrecipRainy days
January28°3.4″20
February31°3.1″18
March39°4.1″19
April51°4.3″20
May59°5.4″19
June68°4.7″19
July73°4.4″18
August73°4.0″18
September66°3.4″16
October55°3.2″15
November41°3.5″18
December32°3.9″20

Frequently asked

When does it freeze in Rosslyn Farms?
In Rosslyn Farms, expect the last spring frost near mid-April; Rosslyn Farms's first autumn frost comes around mid-November.
What is the rainy season in Rosslyn Farms?
Rosslyn Farms sees its heaviest rain in May (around 5.4 inches), part of roughly 47 inches a year.
What is the warmest month in Rosslyn Farms?
The warmest stretch in Rosslyn Farms comes in July, around 73°F on average.
What is the coldest month in Rosslyn Farms?
On average January is the chilliest month in Rosslyn Farms, about 28°F.
When can I start a vegetable garden in Rosslyn Farms?
Frost-hardy sowings begin at mid-April in Rosslyn Farms; warm-season starts follow two weeks on.
How many rainy days does Rosslyn Farms get?
Expect roughly 221 wet days a year in Rosslyn Farms.
What hardiness zone is Rosslyn Farms?
Rosslyn Farms's USDA zone comes from its January mean (28°F); enter the ZIP on the USDA lookup for the number.
What is the 10-day forecast for Rosslyn Farms?
Rosslyn Farms's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Rosslyn Farms?
See this week's day-by-day rain chances for Rosslyn Farms in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Rosslyn Farms?
Current conditions for Rosslyn Farms and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Rosslyn Farms forecast updated?
The Rosslyn Farms forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Rosslyn Farms?
Today's sunrise and sunset times for Rosslyn Farms are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Rosslyn Farms?
The next few days in Rosslyn Farms's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Rosslyn Farms, Pennsylvania occupies a warm-summer humid continental zone, with January means near 28°F and July around 73°F — a 45°F swing.

Rain and snow bring Rosslyn Farms roughly 47 inches a year across approximately 221 measurable-precipitation days.

Latitude 40.4°N gives Rosslyn Farms its 45°F swing, and with it the rhythm of Rosslyn Farms's growing season.

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ZIP codes in Rosslyn Farms

  • 15106

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.