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Sullivans Island Charleston County | SC Climate Division 7 | ID# 388405 ◼ ◼ ◼

Sullivans Island

Location: 32.76 °N, 79.85 °W
Elevation: 5 ft.
Record incorporates data from the following stations: SULLIVANS ISLAND

map showing station location

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Sullivans Island
Average Monthly Precipitation (in inches)


Data Source: Period of Record — Applied Climate Information System (ACIS); Climate Normals (if available) — NOAA’s National Centers for Environmental Information (NCEI)

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Sullivans Island
Historical Monthly Precipitation (in inches)
(Months with missing data are coded 9999)


Data Source: Applied Climate Information System (ACIS)

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Sullivans Island
Seasonal Precipitation (in inches)


* Data Missing: Dec 1984; Sep 1986; Sep 1987; Feb, Apr, Sep, Oct 1989; Aug 1994; Nov, Dec 1995; Jan, Oct 1996; Feb 1999; Mar, Aug, Sep 2000; Jul 2002; Jul 2003; Sep 2008; 2011; Oct 2013; May 2016; Sep 2017; Jan, Sep, Dec 2018; Jan 2019.

Data Source: Applied Climate Information System (ACIS)

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Sullivans Island
Maximum Event Precipitation since 1980 (in inches)

Note: Some duration periods may overlap; the longest duration appears on top.
Years with missing data are coded -9999.

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Maximun Event Precipitation for the Historic Record (in inches)

Data Source: Applied Climate Information System (ACIS)

1-Month 2-Month 3-Month 6-Month 9-Month 12-Month 24-Month All Multi-Duration

graph showing the Standardized Precipitation Index for the station

Data Source: Applied Climate Information System (ACIS)

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12-month 18-month 24-month 36-month 48-month 60-month

graphic showing the probability density function for precipitation at the station

Data Source: Applied Climate Information System (ACIS)

Reading this chart info-icon

graphic showing the probability density function of precipitation for each season at the station

Data Source: Applied Climate Information System (ACIS)

Reading this chart info-icon

12-month 18-month 24-month 36-month 48-month 60-month

graphic showing the recurrence interval for total annual precipitation at the station

Data Source: Applied Climate Information System (ACIS)

Reading a Probablility Density Function Chart

example of a probablity density functionThis chart shows the range and probability of specific precipitation totals. For example, there is about a 2% chance of getting just 35 inches of precipitation in a year. But if you look at the distribution of rainfall (historical rainfall amounts are shown by the blue bars, while the line graph smooths out this distribution), you can see that most years you are likely to get more precipitation than 35 inches.

Reading a Seasonal Probablility Density Function Chart

This graph shows the range and probability of precipitation totals for each season. Each curve is a statistically-derived, best fit to historical data. The peaks represent rainfall totals with the highest probability; the tails of each curve have very low probability.

Reading a Recurrence Interval Chart

These maps show the percentage of average precipitation that can be expected for a specified length of time and specified return period. You may choose 1- to 5-year accumulation periods and see the probability of specific precipitation totals (on the vertical axis) occurring in a given year. A 100-year return means that there is a 1 in 100 (1%) chance of occurrence in a single year.