Lubbock runs an annual average of 56.2% relative humidity with a dew point of 18.33 in. Hold 35–45% indoors and the rest of this page is how.
- Annual relative humidity
- 56.2%
- Annual rainfall
- 18.33 in
- July high / January low
- 102.1 / 27.2 °F
- Elevation
- 3,202 ft
- Indoor target
- 35–45%
The climate, in numbers that matter to a building
Lubbock has a cool semi-arid climate (Köppen BSk), which is a genuinely different thing from El Paso’s desert and from the humid subtropical climate of the eastern half of the state. Rainfall averages 18.33 inches, mean relative humidity 56.2%, and the temperature range is extreme: an average July high of 102.1 °F and an average January low of 27.2 °F.
Elevation matters more than people expect. At 3,202 feet the air is thinner, so the same relative humidity corresponds to less water by mass than it would at sea level. Combined with the temperature swing, this produces a house that dries out hard in winter under heating and dries out again in summer under cooling.
The wind is the third factor and the one that shows up in daily life. Lubbock is among the windiest cities in the United States, and sustained wind drives air exchange through every gap in a building — which is free ventilation in a humid climate and a continuous drying and dust problem in this one.
Through the year in Lubbock
| Season | What the outdoor air does | What that does to a house here |
|---|---|---|
| Spring | Very windy and dry, with dust and rapid temperature swings | Air sealing pays for itself twice over — dust and dryness together |
| Summer | Very hot with low humidity, broken by thunderstorm days | Cooling load is heat, not moisture; evaporative cooling works well most days |
| Fall | The most settled season, with the second rainfall peak | The comfortable weeks; a good time to service humidification before winter |
| Winter | Cold and arid; hard freezes are routine | Heated air falls into the twenties or below. Timber, floors and instruments move |
What this climate does to a house here
The problems below are the ones that turn up repeatedly in Lubbock specifically, rather than the general list.
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Winter indoor humidity in the twenties
Air at 27 °F holds very little water. Heat it to 70 °F and the relative humidity collapses, and in a windy house with continuous infiltration it stays there. Readings below 25% through January are normal rather than exceptional.
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Wind-driven infiltration that defeats humidification
A humidifier in a leaky house on the High Plains is filling a bucket with a hole in it. Sustained wind replaces indoor air far faster than in a sheltered location, so the humidity you add leaves before it does much good. Sealing has to come before equipment here.
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Timber and finish damage from repeated cycling
Floors gap in winter and close in summer, panel doors open at the joints, and finishes crack along the movement lines. It is the annual cycling rather than any single dry month that loosens joints permanently.
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Evaporative cooling and the humid exception
Swamp coolers work well here for most of the summer and add substantial moisture doing it. On thunderstorm days when dew points climb, the same unit leaves a house warm and clammy, and that is the one time a small dehumidifier is useful.
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Dust, not damp
Spring dust is the dominant indoor air complaint in this city, and it drives the same remedy as the humidity problem — air sealing and filtration. The two arguments together usually justify work that neither would justify alone.
What is your reading telling you?
- Dew point
- 53 °F
- Mold risk, cold walls
- Moderate
Still inside the accepted range, but this is where cold surfaces begin to sweat.
Every fix that works here, cheapest first
The complete ladder for a Lubbock house. Sealing comes before equipment here more than anywhere else in the state, because wind undoes everything else.
Do not ventilate for humidity in winter
Outdoor air at 27 °F carries almost nothing. Air the house briefly for air quality and shut it again — long ventilation in a Lubbock winter is a straightforward way to make a dry house drier and a heating bill larger.
Keep the moisture you generate
Dry laundry indoors, leave the bathroom door open after showering, cook without lids. Free humidification, and the exact reverse of the Gulf Coast advice in this same state.
Find and close the wind paths
Under doors, around window frames, at the attic hatch, around pipe and cable penetrations, and at the electrical outlets on exterior walls. On a windy day you can feel most of them with the back of a hand.
Weatherstripping and outlet gaskets
A weekend and modest materials. In a house this exposed, sealing is what makes any humidification worthwhile — it is not a refinement to do afterwards, it is the prerequisite.
A hygrometer where the timber is
Dry-air damage happens quietly. A unit in the room with the timber floor, the piano or the guitar collection turns an invisible problem into a number you can act on.
A humidifier with a humidistat
Set it to 35 to 40%. Check the windows on the coldest mornings — with a hard freeze outside, even 35% can put water on older glass, and the glass is the authority rather than the setting.
Maintain the evaporative cooler, and know when to stop
Clean pads, correct bleed-off, and a hygrometer to tell you when the outdoor air is too damp for it to help. On humid thunderstorm days it should be off rather than working harder.
A small dehumidifier for the humid handful of days
A 20-pint unit covers the exception. Anything larger is buying capacity for a climate this city does not have.
Air sealing, insulation and whole-house humidification
The durable combination on the High Plains. A tighter envelope reduces both the dust and the drying, insulation cuts the heating that causes the drying, and a furnace-mounted humidifier on a humidistat then holds the whole house rather than one room.
Local construction, and why it changes the answer
Lubbock housing is predominantly slab-on-grade with ducted heating and cooling, and the local building tradition is built around heat and wind rather than moisture. That means vapor management details common in humid climates are often absent, and adding them without understanding the local drying direction can do more harm than good.
The wind deserves to be treated as a design condition rather than as weather. Sustained exposure drives air change rates well above what a sheltered house of the same construction would see, which is why two apparently identical houses can hold humidity very differently. If humidification is not working, measure the air leakage before buying a larger machine.
Elevation is a smaller effect but a real one. At 3,200 feet, the same relative humidity corresponds to less water by mass than at sea level, so equipment rated at sea level performs slightly differently, and readings taken here are not directly comparable with those from Houston even when the percentages match.
Common questions
Is Lubbock humid or dry?
Dry, in the way that matters for a house, despite a mean relative humidity of 56.2% that does not sound dry. The rainfall figure tells the real story: 18.33 inches a year against nearly 50 in Houston. What makes the annual average look moderate is cool nights raising the percentage while the water content stays low — which is exactly why dew point is the more honest measure.
Why does my house feel dusty as well as dry?
Because the same wind that drives dry air through the envelope drives dust with it, and spring on the High Plains has plenty of both. The remedy is identical for both problems: seal the air paths, then filter what still comes through. It is one of the few situations where two complaints have a single fix.
Does high altitude change the humidity advice?
Slightly. At 3,200 feet the air is thinner, so a given relative humidity represents less water by mass than the same reading at sea level, and evaporation happens a little faster. The comfort targets do not change — 35 to 45% is still right — but it is one more reason a Lubbock house dries out faster than the percentage suggests.
Should I run a humidifier and a swamp cooler in the same year?
Yes, in opposite seasons, and that is the normal arrangement here. The evaporative cooler humidifies the house all summer as a side effect of cooling it; the humidifier does the job in winter when the heating is drying everything out. What you should not do is run both in the same week, or keep the cooler running on a damp thunderstorm day.
Sources
- US EPA — Mold and moisture guidance — the 30–50% range and the 10 sq ft remediation threshold
- ASHRAE Standard 55 — Thermal environmental conditions for human occupancy — indoor comfort and humidity limits
- US DOE 10 CFR 430 — Dehumidifier test procedure — the 2019 move to 65 °F rating conditions
- NOAA / NWS 1991–2020 Climate Normals, via the city climate tables on Wikipedia
- US Department of Energy — Building America climate zone definitions
- EPA — Indoor Air Quality: moisture control and mold
- DOE 10 CFR 430 — dehumidifier test procedure (2019 method)