Annual mean 10°C · wettest around May · prevailing wind SW
Warmest
27.2 °C
Coldest
-5.6 °C
Wettest
43%
Windiest
7.3 m/s
Prevailing
SW
5.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Marshalltown over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -8°C. Marshalltown has no sharply defined rainy season: the chance of rain on a given day runs from 34% in February, the driest month, to 42% in May, the wettest. Winds in Marshalltown are highest in April, averaging 5.6 m/s (20 km/h), and lightest in July, at 2.9 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in Marshalltown come in July, when the sky is typically 26% covered; January is the cloudiest month, at 54%.
Month by month Marshalltown climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-4°C
-8°C
-11°C
34%
54%
4.8 m/s
0
0
0
February
-1°C
-7°C
-8°C
34%
42%
4.9 m/s
0
0
8
March
7°C
0°C
0°C
38%
48%
5.2 m/s
3
0
20
April
13°C
5°C
7°C
39%
45%
5.6 m/s
18
0
45
May
20°C
12°C
17°C
42%
42%
4.4 m/s
55
10
66
June
26°C
19°C
25°C
40%
27%
3.9 m/s
59
48
32
July
27°C
20°C
28°C
39%
26%
2.9 m/s
47
64
16
August
26°C
18°C
26°C
38%
29%
2.9 m/s
58
54
27
September
24°C
14°C
22°C
40%
30%
3.4 m/s
65
34
49
October
15°C
7°C
11°C
39%
38%
4.2 m/s
32
3
58
November
7°C
0°C
1°C
37%
41%
4.6 m/s
6
0
24
December
0°C
-4°C
-6°C
36%
47%
4.7 m/s
0
0
5
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Marshalltown weather by season
Year round, Marshalltown has days of about -4°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -8°C to 20°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around May and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Marshalltown weather in winterDecember to February
High -2°CLow -6°CRain 35%
Winter in Marshalltown has typical daily highs of about -2°C and lows of about -6°C, with a 35% chance of rain on a given day.
Marshalltown weather in springMarch to May
High 13°CLow 6°CRain 40%
Spring in Marshalltown has typical daily highs of about 13°C and lows of about 6°C, with a 40% chance of rain on a given day.
Marshalltown weather in summerJune to August
High 27°CLow 19°CRain 39%
Summer in Marshalltown has typical daily highs of about 27°C and lows of about 19°C, with a 39% chance of rain on a given day.
Marshalltown weather in autumnSeptember to November
High 15°CLow 7°CRain 38%
Autumn in Marshalltown has typical daily highs of about 15°C and lows of about 7°C, with a 38% chance of rain on a given day.
When is the rainy season in Marshalltown?
Marshalltown has no sharply defined rainy season: the chance of rain on a given day runs from 34% in February, the driest month, to 42% in May, the wettest.
What time of year is Marshalltown windiest?
Winds in Marshalltown are highest in April, averaging 5.6 m/s (20 km/h), and lightest in July, at 2.9 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in Marshalltown year round?
The average temperature in Marshalltown over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -8°C.