Johnston weather in March

In March, Johnston sees average daytime highs of 48°F and overnight lows near 29°F, with 2.6 in of precipitation across 8.8 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 40°F in the first days to 54°F by the end. The sky is clear or mostly clear about 30% of the time in March, and the air most often feels dry.

Daylight stretches from about 10 h 54 min at the start of March to 12 h 24 min by month's end. Set against the rest of the year, March is Johnston's 7th-clearest and 2nd-windiest month. For the whole year in context, see Johnston's year-round climate.

Daytime high
48°
8th warmest
Overnight low
29°
4th coldest
Precipitation
2.6 in
8.8 wet days
Daylight
11 h 42 min
6:35 AM – 6:14 PM
Cloud cover
62%
7th clearest
Wind
10 mph
2nd windiest
Solar energy
4.19 kWh/m²
Travel score
1.7
out of 10

Johnston is city in Polk County, Iowa, United States.

Density
440/km²
people per km²
Founded
1969

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 40°F in the first days to 54°F by the end.

A typical March day in Johnston reaches about 48°F in the afternoon and slips back to 29°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 32°F and 65°F. Set against its neighbours, March runs about 13°F warmer than February and about 13°F cooler than April.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
13922
24022
34022
44123
54123
64224
74224
84325
94425
104426
114526
124627
134628
144728
154729
164829
174930
184930
195031
205031
215132
225132
235133
245233
255233
265334
275334
285434
295435
305535
315535

How March really feels in Johnston

Once humidity and wind are folded in, March averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
6 feel bitter (≤ 14°F)

The story in March is cold — wind chill drags the overnight "feels like" below the raw low.

Johnston weather by month

How March compares with the rest of the year at a glance. March is the 8th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 13°1.26.24.99.30.0
Feb34° / 17°1.46.54.810.30.0
Mar48° / 29°2.68.82.811.71.7
Apr61° / 40°4.311.1113.14.7
May71° / 52°5.513.70.114.36.0
Jun80° / 62°5.012.10156.1
Jul84° / 66°3.79.5014.75.8
Aug82° / 63°3.99.2013.76.6
Sep75° / 55°3.48.6012.37.2
Oct62° / 42°2.980.410.95.7
Nov47° / 30°2.16.51.39.61.8
Dec35° / 19°1.664.190.0

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 14% of March, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24456
34456
44555
54456
64555
74555
84654
94654
104654
114753
124654
134654
144654
154654
164555
174555
184555
194456
204357
214357
224159
234159
244159
254258
264159
274159
284159
294258
304159
314159

Chance of precipitation in March

Any precipitationSnow

Johnston gets around 2.6 in of rain and snow over 8.8 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 32% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
12615
22614
32614
42613
52612
62612
72611
82611
92611
102610
112610
122610
13279
14279
15279
16279
17289
18289
19299
20298
21298
22308
23307
24317
25316
26316
27315
28315
29325
30324
31324

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

Most of March feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, March lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
10991
11991
12991
13991
14991
15991
16991
17982
18982
19982
20982
21982
22982
23982
24982
25982
26982
27982
28982
29982
30982
31982

Wind in March

Winds average 10 mph in March.

Across March, daily wind ranges from about 10 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze
3110light breeze

Sunrise & sunset in March

DaylightNight

Daylight runs from about 10 h 54 min at the start of March to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 90 minutes over March. Sunrise moves from 7:00 AM to 6:09 AM, and sunset from 5:56 PM to 6:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.97:005:56
211.06:585:58
311.06:565:59
411.16:556:00
511.16:536:01
611.26:526:02
711.26:506:04
811.36:486:05
911.36:476:06
1011.46:456:07
1111.46:436:08
1211.56:426:09
1311.56:406:11
1411.66:386:12
1511.66:376:13
1611.76:356:14
1711.76:336:15
1811.76:316:16
1911.86:306:17
2011.86:286:19
2111.96:266:20
2211.96:246:21
2312.06:236:22
2412.06:216:23
2512.16:196:24
2612.16:176:25
2712.26:166:26
2812.26:146:28
2912.36:126:29
3012.36:106:30
3112.46:096:31

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.19 kWh/m².

For context, solar energy here swings from a low near 1.8 kWh/m² to a high of 6.47 kWh/m² in July across the year — March's 4.19 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
13.7Moderate
23.8Moderate
33.8Moderate
43.9Moderate
53.9Moderate
63.9Moderate
74.0Moderate
84.0Bright
94.0Bright
104.1Bright
114.1Bright
124.1Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.4Bright
244.4Bright
254.4Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.6Bright
314.6Bright
Planning a trip in March

Is March a good time to visit Johnston?

Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

1.7
Sightseeing
9th-best month of the year
0.0
Beach & pool
9th-best month of the year

March is a weaker month for outdoor sightseeing in Johnston.

What to pack for Johnston in March

From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In March, Johnston sees daytime highs around 48°F and nights near 29°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

UV index in Johnston in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Johnston peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 20UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Johnston in March

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.

Air quality in Johnston is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodJul 2016 µg/m³Oct 217 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar14Moderate
Apr11Good
May11Good
Jun12Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct7Good
Nov9Good
Dec10Good
Location & terrain

Where is Johnston?

Johnston sits at 41.7°N, 93.7°W, 830 ft above sea level, in United States. The nearest listed city is Urbandale, 3.1 mi away.

Topography around Johnston

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Johnston.

Within 2 miles, the terrain around Johnston has only modest variations in elevation — a maximum elevation change of 217 ft around an average of 846 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 305 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 787 ft.

The land around Johnston is covered by trees (40%) and grassland (26%) within 2 miles, trees (29%), cropland (25%) and grassland (22%) within 10 miles, and cropland (65%) within 50 miles.

2 miles
217 ft
10 miles
305 ft
50 miles
787 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
March weather nearby: Urbandale 3.1 mi · Clive 5.0 mi · Ankeny 6.2 mi · West Des Moines 6.8 mi · Des Moines 6.8 mi · Waukee 11 mi · Altoona 12 mi · Indianola 23 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Johnston (41.673°, -93.6977°, elevation 830 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).