Climate Johnston - Iowa
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 30 | 35 | 49 | 62 | 72 | 80 |
| Average low in ºF Av. low Lo | 12 | 17 | 28 | 40 | 51 | 61 |
| Av. precipitation in inch Av. precip. Pre. | 0.98 | 1.19 | 2.21 | 3.71 | 4.46 | 5.30 |
| Av. snowfall in inch Snowfall Sn | 11 | 10 | 6 | 2 | 0 | 0 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 85 | 83 | 76 | 63 | 47 | 33 |
| Average low in ºF Av. low Lo | 65 | 63 | 54 | 42 | 29 | 17 |
| Av. precipitation in inch Av. precip. Pre. | 4.78 | 4.04 | 3.15 | 2.54 | 1.94 | 1.31 |
| Av. snowfall in inch Snowfall Sn | 0 | 0 | 0 | 1 | 2 | 9 |
What is the average weather in Johnston, Iowa?
Johnston experiences a humid continental climate, marked by very strong seasonal contrasts. Summers are warm and fairly wet, with June being the wettest month. Winters are cold and snowy, bringing significant snowfall. Precipitation is spread relatively evenly through the year, with winter moisture often arriving as snow.
Johnston Climate Graph - Iowa Climate Chart
Daily normals Johnston - Iowa - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 29.8 | 12.8 | 0.04 | 0.04 | 0.31 | 0.80 |
| 2 Jan | 29.7 | 12.6 | 0.08 | 0.08 | 0.59 | 1.50 |
| 3 Jan | 29.7 | 12.5 | 0.08 | 0.08 | 0.79 | 2.00 |
| 4 Jan | 29.7 | 12.4 | 0.12 | 0.12 | 1.10 | 2.80 |
| 5 Jan | 29.7 | 12.3 | 0.16 | 0.16 | 1.42 | 3.60 |
| 6 Jan | 29.6 | 12.2 | 0.16 | 0.16 | 1.61 | 4.10 |
| 7 Jan | 29.6 | 12.1 | 0.20 | 0.20 | 2.01 | 5.10 |
| 8 Jan | 29.7 | 12.1 | 0.24 | 0.24 | 2.20 | 5.60 |
| 9 Jan | 29.7 | 12.0 | 0.24 | 0.24 | 2.52 | 6.40 |
| 10 Jan | 29.7 | 11.9 | 0.28 | 0.28 | 2.80 | 7.10 |
| 11 Jan | 29.7 | 11.9 | 0.31 | 0.31 | 3.11 | 7.90 |
| 12 Jan | 29.8 | 11.9 | 0.35 | 0.35 | 3.39 | 8.60 |
| 13 Jan | 29.8 | 11.8 | 0.35 | 0.35 | 3.82 | 9.70 |
| 14 Jan | 29.8 | 11.8 | 0.39 | 0.39 | 4.09 | 10.40 |
| 15 Jan | 29.9 | 11.8 | 0.43 | 0.43 | 4.49 | 11.40 |
| 16 Jan | 30.0 | 11.8 | 0.47 | 0.47 | 4.80 | 12.20 |
| 17 Jan | 30.0 | 11.8 | 0.47 | 0.47 | 5.20 | 13.20 |
| 18 Jan | 30.1 | 11.8 | 0.51 | 0.51 | 5.51 | 14.00 |
| 19 Jan | 30.2 | 11.9 | 0.55 | 0.55 | 5.91 | 15.00 |
| 20 Jan | 30.2 | 11.9 | 0.59 | 0.59 | 6.18 | 15.70 |
| 21 Jan | 30.3 | 12.0 | 0.59 | 0.59 | 6.61 | 16.80 |
| 22 Jan | 30.4 | 12.0 | 0.67 | 0.67 | 6.89 | 17.50 |
| 23 Jan | 30.5 | 12.1 | 0.67 | 0.67 | 7.28 | 18.50 |
| 24 Jan | 30.6 | 12.2 | 0.71 | 0.71 | 7.72 | 19.60 |
| 25 Jan | 30.7 | 12.3 | 0.75 | 0.75 | 8.11 | 20.60 |
| 26 Jan | 30.9 | 12.4 | 0.79 | 0.79 | 8.50 | 21.60 |
| 27 Jan | 31.0 | 12.5 | 0.83 | 0.83 | 8.90 | 22.60 |
| 28 Jan | 31.1 | 12.6 | 0.87 | 0.87 | 9.29 | 23.60 |
| 29 Jan | 31.2 | 12.8 | 0.91 | 0.91 | 9.69 | 24.60 |
| 30 Jan | 31.4 | 12.9 | 0.94 | 0.94 | 10.12 | 25.70 |
| 31 Jan | 31.6 | 13.1 | 0.98 | 0.98 | 10.51 | 26.70 |
Weather history Johnston - July 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Jul | 89.1 | 78.1 | 0.00 | - | - |
| 02 Jul | - | - | - | - | - |
| 03 Jul | - | - | - | - | - |
| 04 Jul | - | - | - | - | - |
| 05 Jul | - | - | - | - | - |
| 06 Jul | - | - | - | - | - |
| 07 Jul | - | - | - | - | - |
| 08 Jul | - | - | - | - | - |
| 09 Jul | - | - | - | - | - |
| 10 Jul | - | - | - | - | - |
| 11 Jul | - | - | - | - | - |
| 12 Jul | - | - | - | - | - |
| 13 Jul | - | - | - | - | - |
| 14 Jul | - | - | - | - | - |
| 15 Jul | - | - | - | - | - |
| 16 Jul | - | - | - | - | - |
| 17 Jul | - | - | - | - | - |
| 18 Jul | - | - | - | - | - |
| 19 Jul | - | - | - | - | - |
| 20 Jul | - | - | - | - | - |
| 21 Jul | - | - | - | - | - |
| 22 Jul | - | - | - | - | - |
| 23 Jul | - | - | - | - | - |
| 24 Jul | - | - | - | - | - |
| 25 Jul | - | - | - | - | - |
| 26 Jul | - | - | - | - | - |
| 27 Jul | - | - | - | - | - |
| 28 Jul | - | - | - | - | - |
| 29 Jul | - | - | - | - | - |
| 30 Jul | - | - | - | - | - |
| 31 Jul | - | - | - | - | - |
Past weather Johnston
| Jul 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 89.1 ºF | 30 ºF | |
| Average low temperature Av. low temp. | 78.1 ºF | 12 ºF | |
| Total precipitation Total precip. | 0.00 inch | 0.98 inch | |
| Total snowfall Total snowfall | - inch | 11 inch | |
| Highest max temperature Highest max temp. | 89.1 ºF | - | |
| Lowest max temperature Lowest max temp. | 89.1 ºF | - | |
| Highest min temperature Highest min temp. | 78.1 ºF | - | |
| Lowest min temperature Lowest min temp. | 78.1 ºF | - | |
Past weather July 2026 incomplete - Missing data
Geo Johnston - Iowa
| Country | United States | |
|---|---|---|
| State | Iowa | |
| County | - | |
| City | Johnston | |
| Zip Code | 50131 | |
| Longitude | -93.71 dec. degr. | |
| Latitude | 41.67 dec. degr. | |
| Altitude - Elevation | 830ft | |
| ICAO | - | |
| IATA | - |
Date and Time Johnston - Iowa
| Local Time | 01:29 PM | |
|---|---|---|
| Sunrise | 05:44 AM | |
| Sunset | 08:54 PM | |
| Day/Night | Day | |
| Timezone | Central Daylight Time | |
| Timezone DB | America - Chicago |
Map of Johnston - Iowa
USGS National Map — Open interactive map
Johnston weather averages
| Annual high temperature | 60ºF |
| Annual low temperature | 40ºF |
| Average annual precip. | 35.61 inch |
| Av. annual snowfall | 41 inch |
Station Data
Monthly averages Johnston
Longitude: -93.7058, Latitude: 41.6714
Average weather Johnston, IA - 50131
Monthly: 1991-2020 normals
History: 2008-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...