Weather StoryAlmanac, microseasons, and the day's weather story.

Welby, Colorado Weather

Monsoon storms drench the south. Day 14 of summer. Read this microseason across nine climate regions →

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

Welby, CO
Saturday, July 4 at 8:45 AM
73
°
Clear
Feels like
70°
Humidity
35%
Wind
4 mph
Sunrise
11:37 PM
Sunset
2:31 PM
Welby, CO
Hour by hour · 24h
24-Hour ForecastWelby, CO: 24-hour forecast. Temperatures range from 63 to 93 degrees Fahrenheit.
L 63°H 93°
Welby, CO
7-day forecast
  1. Today
    Jul 4
    Overcast
    —
    —
    93°62°—
  2. Sunday
    Jul 5
    Overcast
    —
    —
    96°63°+3°
  3. Monday
    Jul 6
    Overcast
    10%
    —
    98°68°+2°
  4. Tuesday
    Jul 7
    Overcast
    49%
    —
    97°73°-1°
  5. Wednesday
    Jul 8
    Light Drizzle
    38%
    0.01″
    96°70°-1°
  6. Thursday
    Jul 9
    Overcast
    30%
    —
    97°67°+1°
  7. Friday
    Jul 10
    Overcast
    10%
    —
    101°75°+4°
Welby, CO
Next 24 hours · Mild now
HOT 90°55°78°100°6a12p6p12anow 69°high 93°low 63°
Welby, CO
Anemometer · 24h winds · from true
NESW
From · True
ENE
061° · veering 61°
Direction
ENE
061°
Sustained
4
mph
Gust
10
mph
Peak 24h
20
avg 6
Beaufort · 2 · LIGHT BRZ
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 20 @ 9:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 243SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 61° from the ene.
Welby, CO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
847.8
+3.9 mb in 3h · rising rapidly · 25.04 inHg
Now
847.8
mb
3h
+3.9
mb
12h
+1.6
mb
24h
+0.7
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 842–848
835840845850855-21h-18h-15h-12h-9h-6h-3h-24hNOW846.5842.3846.2
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Welby, CO
Air quality
59
AQI
Moderate
→-1 in 6h

AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.1 µg/m³ (AQI 66) with a 0.92 fine-to-coarse ratio and 4 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.

PM 2.5DRIVERModerate
17.1μg/m³
PM 10Good
19μg/m³
NO₂Good
18μg/m³
OzoneModerate
64μg/m³
UV IndexLow
1.4

What's driving it

Ozone × UV × Sky

Ozone at AQI 30 now. With UV 4.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 around 1 PM.

Present
AQI 30
UV peak
4.7 at 1 PM
Sky at peak
clear
Projected peak
AQI 19

PM × Wind × Precip

PM2.5 at 17.1 µg/m³ (AQI 66) with a 0.92 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.92
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/m³300
Welby, CO
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
108.3mi
UNLIMITED
185 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
14:45 UTC · Welby, CO · 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
14:45 UTC · Welby, CO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Welby, CO
Satellite · infrared · animated
Welby, CO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Welby, CO
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:05 AM
Sunrise
11:37 PM
Daylight
14h 54m
Sunset
2:31 PM
Civil dusk
9:05 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Welby, CO
The moon
Waning Gibbous
81% illuminated
Moonrise
10:55 PM
Moonset
10:08 AM
In sign
♓︎ Pisces
Welby, CO
Microseason
Jul 1–5

Monsoon storms drench the south

weather
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Welby at a glance

  • Today vs. normal: 73°F — typical for the season
  • Last frost: April 15 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Welby

  1. Sat93°62°5%
  2. Sun96°63°4%
  3. Mon98°68°10%
  4. Tue97°73°49%
  5. Wed96°70°38%
  6. Thu97°67°30%
  7. Fri101°75°10%
  8. Sat98°69°5%
  9. Sun106°75°8%
  10. Mon108°78°16%
  11. Tue104°81°26%
  12. Wed94°71°49%
  13. Thu89°69°49%
  14. Fri93°70°48%
  15. Sat97°72°42%
  16. Sun98°76°39%

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 — Welby

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

  • TODAYSLGTSlight Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • 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: Deep freeze grips the high peaks.January 6–10: Ice thickens on alpine tarns.January 11–15: Springs stir beneath locked earth.January 16–20: Grouse call from the transition zone.January 21–25: First signals of the soil's turning.January 26–31: Stream water crystallizes thick.February 1–5: The year's coldest fortnight begins.February 6–10: East wind carries a subtle promise.February 11–15: Snowmelt springs whisper beneath ice.February 16–20: Red-wing calls rise from the wetlands.February 21–25: Rain begins to trace the snowline upward.February 26–28: Mist gathers in the warming canyons.March 1–5: Grass and trees stir from their sleep.March 6–10: Hibernators break through frozen ground.March 11–15: First blooms open to the spring sun.March 16–20: Mountain bluebirds return to the summits.March 21–25: Spring equinox at the divide.March 26–31: Aspen catkins burst in clusters.April 1–5: Thunderstorms rumble over granite peaks.April 6–10: Swallows and swifts slice the warming sky.April 11–15: Sandhill cranes call through the wetlands.April 16–20: Rainbows arch over the snowfields.April 21–25: New growth explodes across the montane.April 26–30: Last frost yields to summer growth.May 1–5: Wildflowers crest the high meadows.May 6–10: Summer monsoon clouds gather southward.May 11–15: Snowmelt crests toward the divide.May 16–20: High country wildflowers peak.May 21–25: Summer heat accelerates the growing season.May 26–31: Summer settles into the high country.June 1–5: Pikas hayfeeding in granite peaks.June 6–10: Glacier lily carpets the snowmelt.June 11–15: Paintbrush crowns the ridges.June 16–20: Thunderheads build by noon.June 21–25: Long light holds the peaks.June 26–30: Monsoon moisture drifts north.July 1–5: Monsoon storms drench the south.July 6–10: Wind builds through canyons.July 11–15: Lightning crowns every peak.July 16–20: Elk herds claim alpine meadows.July 21–25: Pika caches reach their peak.July 26–31: Monsoon pulses weaken northward.August 1–5: Summer heat breaks with monsoon.August 6–10: First frost creeps to peaks.August 11–15: Cool wind returns from north.August 16–20: Monsoon clouds gather over the peaks.August 21–25: The monsoon breaks into scattered showers.August 26–31: Summer insects thin as autumn wind rises.September 1–5: Elk descend from summer high meadows.September 6–10: Dew crystallizes on high grass at dawn.September 11–15: Hawks begin the long crossing southward.September 16–20: Equinox: darkness claims the high passes.September 21–25: Thunder retreats as the monsoon dies.September 26–30: First frost hardens the high valleys.October 1–5: October: the aspen stands reach their peak.October 6–10: Aspen gold slides downslope with the chill.October 11–15: Snow settles on the high passes.October 16–20: Elk bugling fades as rut nears its end.October 21–25: First hard frost grips the basin.October 26–31: Late rains settle into November patterns.November 1–5: Aspen canopy falls to earth.November 6–10: Granite bones emerge from cover.November 11–15: Earth begins to harden.November 16–20: Bare ranges hold silence.November 21–25: Snow returns to the peaks.November 26–30: North wind strips the landscape.December 1–5: Deep darkness settles over the ranges.December 6–10: Winter locks the high country.December 11–15: Elk withdraw to winter range.December 16–20: Ice thickens across frozen water.December 21–25: Winter solstice — the sun returns.December 26–31: The year closes 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

Monsoon storms drench the south

Monsoon established in southern Mountain West (New Mexico, southern Utah, Arizona north); afternoon downpours and lightning common.

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

Welby peaks at about 72°F in July and bottoms near 25°F in December; May brings the heaviest rain (3.3 inches) and January the least (0.9 inches).

MonthMean tempPrecipRainy days
January25°0.9″10
February28°1.1″11
March33°1.9″15
April44°2.6″18
May55°3.3″21
June66°2.1″20
July72°2.2″23
August70°1.8″23
September63°1.4″15
October48°1.4″11
November33°1.4″12
December25°0.9″10

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Welby's January averages 25°F and July 72°F — 46°F apart — while precipitation totals roughly 21 inches over some 191 days.

Summer convection drives Welby's precipitation: May logs 3.3 inches on 21.2 rainy days, against January's 0.9 inches on 10.4 — warm-season storms carry Welby's moisture. That puts Welby in a summer-convective cohort with places like Sherrelwood, CO, North Washington, CO and Twin Lakes, CO.

Welby's growing window opens around mid-April, once Welby's overnight lows stop freezing — sow kale, peas, spinach, and parsnips. Hold Welby's tender crops — tomatoes, peppers, basil — until 10-14 days past Welby's last frost. Welby's window closes around mid-November as overnight lows return below freezing. Within Welby, cold-air pooling chills low spots by 5-10°F, shifting Welby's local frost dates.

Similar climates: Sherrelwood, CO, North Washington, CO, Twin Lakes, CO, Derby, CO, Federal Heights, CO.

Frequently asked

When does it freeze in Welby?
Frost typically leaves Welby by mid-April and returns to Welby near mid-November.
What is the rainy season in Welby?
Welby sees its heaviest rain in May (around 3.3 inches), part of roughly 21 inches a year.
What is the warmest month in Welby?
Welby peaks in July, when the mean runs near 72°F.
What is the coldest month in Welby?
December is Welby's coldest month, averaging about 25°F.
When can I start a vegetable garden in Welby?
Hardy spring crops go in near mid-April in Welby; tender peppers and squash wait 10–14 days.
How many rainy days does Welby get?
Welby records around 191 days of measurable precipitation annually.
What hardiness zone is Welby?
Since December in Welby averages 25°F, Welby's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Welby?
Welby'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 Welby?
See this week's day-by-day rain chances for Welby in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Welby?
Current conditions for Welby and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Welby forecast updated?
The Welby forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Welby?
Today's sunrise and sunset times for Welby 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 Welby?
The next few days in Welby's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a hot desert zone, Welby, Colorado swings from 25°F in the heart of winter to 72°F at midsummer — a 47°F arc.

Across the year, Welby collects about 21 inches of precipitation over roughly 191 days with measurable rain or snow.

Welby's 47°F range, set by its 39.8°N position, drives frost timing and what thrives in Welby.

All cities in Colorado →

Thornton, CO weather →

ZIP codes in Welby

  • 80229

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.