Ohio · 227 m elevation

Barometric Pressure in Columbus, OH

• 30.06Average pressure (inHg, sea level)
• 204.2Swing days a year · 17th of 50
• 108.9Big-swing days a year (≥10 hPa)
• 120.1Significant 24h drop days a year

Overview

Columbus averages 30.06 inHg (1017.8 hPa) with 204.2 significant pressure swing days a year — 26.8 in January versus 5.2 in July. Full 10-year data.

Across 2015-2024, sea-level pressure in Columbus averaged 30.06 inHg (1017.8 hPa), with a median of 30.04 inHg (1017.4 hPa). Most hours fall between 29.72 inHg (1006.6 hPa) at the 5th percentile and 30.42 inHg (1030.2 hPa) at the 95th — a 0.70 inHg (23.6 hPa) band that covers the normal march of highs and lows across central Ohio. The standard deviation is 0.21 inHg (7.13 hPa), ranking #20 of the 50 cities tracked here, against a national median of 6.87 hPa.

Columbus sits at 227 m (about 745 ft), and that elevation matters if you own a barometer. Mean station pressure — the actual weight of air at the surface — is 29.25 inHg (990.5 hPa), roughly 0.81 inHg (27.3 hPa) below the sea-level-adjusted value quoted in forecasts. An uncalibrated instrument in a Columbus home will read near 29.25 inHg on an ordinary day, not 30.06. That gap is a fixed offset, not an error; what matters for tracking weather is the direction and speed of change, not the absolute number.

By national standards Columbus is moderately volatile: 204.2 significant swing days per year (a 24-hour change of at least 0.18 inHg / 6 hPa), ranking #17 of 50 against a median of 180.7, and 108.9 big-swing days (0.30 inHg / 10 hPa or more), ranking #18 against a median of 86.1. That works out to roughly 1.77 times Atlanta's swing count and about 10.3 times Miami's, but only 73% of Denver's. Indianapolis, at 198.7 swing days, is a near-twin; Cleveland runs about 13% busier at 231.2. The typical 24-hour change is small — a median absolute move of 0.11 inHg (3.6 hPa) — but the tail is long, with the 95th percentile at 0.43 inHg (14.6 hPa).

Migraine & pressure-sensitivity outlook

• Low — under 6 hPa (0.18 inHg)
• Elevated — 6 to 10 hPa
• High — 10 hPa (0.30 inHg) or more
• Dashed outline = forecast (after today)

Association only. This calendar shows days when pressure changed — or is forecast to change — sharply over 24 hours, conditions associated with pressure sensitivity in some people. It is not a prediction of symptoms, not a diagnosis, and not medical advice. The 30 days of history are there so you can compare the days you actually felt something against what the barometer did. Talk to a clinician about headache or migraine management.

For people who track barometric pressure, Columbus produces conditions many pressure-sensitive people report as triggers on roughly 204 days a year — about 56% of all days see a 24-hour change of at least 0.18 inHg (6 hPa). Of those, 108.9 days per year cross the larger 0.30 inHg (10 hPa) threshold, and 120.1 are drop days, meaning the significant move was a fall rather than a rise. Falling pressure is the pattern most often described as bothersome, and Columbus averages one such day roughly every three days.

The seasonal concentration is the practical point. Drop days cluster hard in winter: 16.6 in January, 16.3 in March, 16.2 in February and 15.1 in December, against 2.5 in August, 2.7 in July and 4.2 in September. December through March accounts for the bulk of the year's sharp falls, and all five of the largest 24-hour drops in the record occurred in that window. Late summer is the calm stretch — July and August combined produce fewer significant swing days than January alone.

In national context, Columbus is meaningfully more active than the median city but far from the extreme. It sees about 1.77 times Atlanta's swing days and roughly 10.3 times Miami's, where big-swing days average just 3.2 a year versus 108.9 here — a 34-fold difference. On the other side, Denver (281.6 swing days), Boston (257.6) and Minneapolis (249.9) all run well ahead. Anyone comparing Columbus to Indianapolis (198.7) or Cleveland (231.2) will find little practical difference; comparing it to the Southwest or the California coast is another matter entirely. And the distinction worth repeating: individual Columbus storms rank among the sharpest in the country even though its everyday variability is mid-pack.

Seasonal patterns

Columbus behaves like two different cities depending on the calendar. January produces 26.8 significant swing days, February 25.2, March 25.0 and December 24.7. July produces 5.2 and August 5.4 — January runs about 5.2 times July. Month-to-month variability tells the same story: the standard deviation falls from 0.27 inHg (9.3 hPa) in January to 0.11 inHg (3.63 hPa) in August. Mean pressure peaks in November and January at 30.14 inHg (1020.6 and 1020.5 hPa) and bottoms out in June at 29.95 inHg (1014.4 hPa).

The driver is the position of the polar jet. From late fall through early spring it sits over the Ohio Valley, steering clipper systems and Gulf-fed lows across Ohio in close succession, each one pulling the barometer down and then rebounding behind it. By July the jet has retreated north, Columbus sits under weak subtropical ridging, and pressure barely moves outside of afternoon thunderstorm activity. Six-hour changes stay tight overall — the 5th and 95th percentiles are −0.13 and +0.13 inHg (−4.4 and +4.3 hPa) — but the sharpest 6-hour fall on record reached 0.65 inHg (22.0 hPa).

Columbus punches above its weight on single extreme events. Its largest 24-hour drop, 1.25 inHg (42.4 hPa) ending 2024-01-09 at 18:00, ranks #9 of 50 nationally — deeper than Denver's worst of 1.16 inHg (39.2 hPa), despite Denver ranking first for swing frequency. The next four: 0.94 inHg (31.9 hPa) ending 2020-01-18, 0.91 inHg (30.9 hPa) ending 2023-03-03, 0.83 inHg (28.0 hPa) ending 2016-02-24, and 0.82 inHg (27.7 hPa) ending 2019-02-24. All five fell in January, February or March. The March 2023 event also set the ten-year record low of 28.99 inHg (981.7 hPa) at 18:00 on 2023-03-03, one hour before that drop concluded. The record high, 30.94 inHg (1047.6 hPa), came under a strong Arctic high on 2019-02-09 at 10:00. The largest 24-hour rise on record is 1.07 inHg (36.1 hPa).

Month by month

Swing days: 24-hour change of at least 6 hPa (0.18 inHg). Drop days: 24-hour fall of at least 6 hPa. Averages per year, 2015–2024.

Records and extremes

Sharpest 24-hour drops, 2015–2024

Nearby cities

• Cleveland, OH
• Detroit, MI
• Indianapolis, IN
• Louisville, KY
• Chicago, IL
• Washington, DC

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