May weather forecast
Castle Grove, IA

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Weather in May

The last month of the spring, May, is an agreeable month in Castle Grove, Iowa, with an average temperature varying between 51.1°F (10.6°C) and 68.4°F (20.2°C).

Temperature

The beginning of May marks a shift in the average high-temperature, moving from April's refreshing 56.1°F (13.4°C) to an agreeable 68.4°F (20.2°C). An average low-temperature of 51.1°F (10.6°C) is anticipated throughout the nights during May.

Humidity

In May, the average relative humidity is 80%.

Rainfall

The month with the most rainfall is May, when the rain falls for 18.6 days and typically aggregates up to 4.25" (108mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In May, the average length of the day is 14h and 37min.
On the first day of the month, sunrise is at 5:59 am and sunset at 8:05 pm. On the last day of May, sunrise is at 5:31 am and sunset at 8:34 pm CDT.

Sunshine

In May, the average sunshine in Castle Grove is 8.4h.

UV index

In Castle Grove, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, the UV index of 5 transforms into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.

Frequently asked questions

What are May temperatures?

The high-temperature in Castle Grove during May is 68.4°F (20.2°C) and the low-temperature is 51.1°F (10.6°C).

What is the average humidity in May?

In Castle Grove, the average relative humidity in May is 80%.

What is the wettest month?

May is the month with the most rainfall. Rain falls for 18.6 days and accumulates 4.25" (108mm) of precipitation.

How much does it rain in May?

In May, in Castle Grove, the rain falls for 18.6 days. Throughout May, 4.25" (108mm) of precipitation is accumulated.

When it does not snow in Castle Grove?

In Castle Grove, snow does not fall in May through September.

Does it snow in May?

In May, it doesn't snow. April is the latest month when it typically snows.

How many hours of daylight does Castle Grove have in May?

The average day length in May is 14h and 37min.

What time are sunrise and sunset in May?

In May, on the first day of the month, sunrise is at 5:59 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 8:34 pm CDT.

How long on average sun shines in May?

The average sunshine duration in May is 8.4h.

How high is the UV index in May?

The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Castle Grove, IA

Average temperature in May - Castle Grove, IA
  • Average high temperature in May: 68.4°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (25.2°F).

  • Average low temperature in May: 51.1°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).

Average pressure in May
Castle Grove, IA

Average pressure in May - Castle Grove, IA
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in May
Castle Grove, IA

Average wind speed in May - Castle Grove, IA
  • Average wind speed in May: 9.1mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity in May
Castle Grove, IA

Average humidity in May - Castle Grove, IA
  • Average humidity in May: 80%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall in May
Castle Grove, IA

Average rainfall in May - Castle Grove, IA
  • Average rainfall in May: 4.25"

The wettest month (with the highest rainfall) is May (4.25").
The driest months (with the least rainfall) are January and February (1.26").

Average rainfall days in May
Castle Grove, IA

Average rainfall days in May - Castle Grove, IA
  • Average rainfall days in May: 18.6 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in May
Castle Grove, IA

Average snowfall in May - Castle Grove, IA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Castle Grove, IA

Average snowfall days in May - Castle Grove, IA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (12.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Castle Grove, IA

Average daylight in May / Average sunshine in May - Castle Grove, IA
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in May: 8h and 2min

The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in May
Castle Grove, IA

Average sunshine days in May - Castle Grove, IA
  • Average sunshine days in May: 10.6 days

The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in May
Castle Grove, IA

Average UV index in May - Castle Grove, IA
  • Average UV index in May: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in May
Castle Grove, IA

Average cloud cover in May - Castle Grove, IA
  • Average cloud cover in May: 44

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in May
Castle Grove, IA

Average visibility in May - Castle Grove, IA
  • Average visibility in May: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Castle Grove, Iowa, USA

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