Longest dry spell
The most days in a row in the year without a wet day, meaning a day with a tenth of an inch of rain or more. It counts only inside the calendar year, so a dry spell that runs past New Year's Day is split in two. The rain is the county average of NOAA's daily map of weather station readings, made of squares about 3 miles wide. A state's figure is the average of its counties, each weighted by its land area. Lower 48 states only, from 1951.
Reported for3,108areas, in 49 states — none in AK, HI, PR
Link to density0.34not mostly about how urban a place is
Nearby places alike0.84Moran’s I: strongly, neighbouring places tend to be similar
Typeratedays
How it has moved
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Every state, every year
One row per state and one column per year, sorted by the latest value. It shows states, not counties: nobody can scan 3,222 rows, and the pattern only shows when it all fits on one screen.
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Where it comes from
NOAA NCEI nClimGrid-Daily · NOAA NCEI nClimGrid-Daily v1.0.0 county averages (prcp/tmax/tmin, scaled), longest_dry_spell; states, counties averaged by land area
The most days in a row without a wet day. Counted on the county's average, so combined areas are weighted by their size.
Combining areas: an average weighted by NCLIMGRID.LAND_SQKM.
What it goes with
The strongest links that have a page of their own. Unadjusted is the link before adjusting for anything, from −1 (opposite) to +1 (in step). Adjusted compares places with the same population density, income and education levels, so those differences can’t explain the link. This list leaves out the 2 pairs built from the same numbers or the same model as this measure, since they are bound to match.
| Measure | Unadjusted | Adjusted |
|---|---|---|
| Longest dry spell and Share Hispanic or Latino, any raceWhere Longest dry spell is higher, Share Hispanic or Latino, any race tends to be higher: a moderate link that holds when only places with similar density, income and education are compared. Share Hispanic or Latino, any race by US county | +0.55 | +0.55 |
| Longest dry spell and Share foreign-bornWhere Longest dry spell is higher, Share foreign-born tends to be higher: a moderate link that holds when only places with similar density, income and education are compared, and inside states as well. Share foreign-born by US county | +0.42 | +0.50 |
| Longest dry spell and Cloud coverWhere Longest dry spell is higher, Cloud cover tends to be lower: a moderate link that holds when only places with similar density, income and education are compared, and inside states as well. Cloud cover by US county | -0.48 | -0.48 |
| Longest dry spell and Clear daysWhere Longest dry spell is higher, Clear days tends to be higher: a moderate link that holds when only places with similar density, income and education are compared, and inside states as well. Clear days by US county | +0.49 | +0.48 |
| Longest dry spell and Routine checkup in the past yearWhere Longest dry spell is higher, Routine checkup in the past year tends to be lower: a moderate link that holds when only places with similar density, income and education are compared. Routine checkup in the past year by US county | -0.53 | -0.47 |
| Longest dry spell and Daily sunlightWhere Longest dry spell is higher, Daily sunlight tends to be higher: a moderate link that holds when only places with similar density, income and education are compared, and inside states as well. Daily sunlight by US county | +0.45 | +0.46 |
| Longest dry spell and Share White, not HispanicWhere Longest dry spell is higher, Share White, not Hispanic tends to be lower: a moderate link that holds when only places with similar density, income and education are compared. Share White, not Hispanic by US county | -0.33 | -0.45 |
| Longest dry spell and Median gross rentWhere Longest dry spell is higher, Median gross rent tends to be higher: a moderate link that holds when only places with similar density, income and education are compared. Median gross rent by US county | +0.24 | +0.42 |
| Longest dry spell and Cancer other than skin cancerWhere Longest dry spell is higher, Cancer other than skin cancer tends to be lower: a moderate link that holds when only places with similar density, income and education are compared. Cancer other than skin cancer by US county | -0.30 | -0.42 |
| Longest dry spell and Share Asian, not HispanicWhere Longest dry spell is higher, Share Asian, not Hispanic tends to be higher: a moderate link that holds when only places with similar density, income and education are compared. Share Asian, not Hispanic by US county | +0.30 | +0.41 |
15 more pairs with longest dry spell have a page: Arthritis · Colorectal cancer screening · Natural amenities scale · Adults under 65 without health insurance · Homeownership rate · Days of 90°F or hotter · Environment score · Robbery rate · Winter daily sunlight · Vision disability · Fine particulate matter · Fair or poor self-rated health · Population (WONDER) · Summer daily high · Women who gave birth in the past year.
Population makeup
How this measure varies with the racial and ethnic makeup of counties. Every group is shown, whatever its rank. These are links across counties: they describe places, not people. They say nothing about any person’s risk or behaviour based on their race. Counties with a larger share of one group also differ in much else, such as income, segregation, region and history. The adjusted figure only accounts for density, income and education.
| Share of residents | Unadjusted | Adjusted |
|---|---|---|
| Longest dry spell and Share White, not HispanicWhere Longest dry spell is higher, Share White, not Hispanic tends to be lower: a moderate link that holds when only places with similar density, income and education are compared. Share White, not Hispanic by US county | -0.33 | -0.45 |
| Longest dry spell and Share Black, not HispanicCould easily be chance once only places with similar density, income and education are compared. Share Black, not Hispanic by US county | -0.14 | -0.02 |
| Longest dry spell and Share Hispanic or Latino, any raceWhere Longest dry spell is higher, Share Hispanic or Latino, any race tends to be higher: a moderate link that holds when only places with similar density, income and education are compared. Share Hispanic or Latino, any race by US county | +0.55 | +0.55 |
| Longest dry spell and Share Asian, not HispanicWhere Longest dry spell is higher, Share Asian, not Hispanic tends to be higher: a moderate link that holds when only places with similar density, income and education are compared. Share Asian, not Hispanic by US county | +0.30 | +0.41 |
| Longest dry spell and Share American Indian or Alaska Native, not HispanicCould easily be chance once only places with similar density, income and education are compared. Share American Indian or Alaska Native, not Hispanic by US county | +0.04 | +0.04 |
Highest and lowest
Of 3,108 counties reporting it. These are the two ends of a national ranking. For most measures, that ranking mostly sorts places by income and how urban they are. That is why the place pages compare each place with similar places instead.
Highest
- San Joaquin County, CA — 206
- Kings County, CA — 198
- San Luis Obispo County, CA — 197
- Merced County, CA — 184
- Sacramento County, CA — 172
Lowest
- Bell County, KY — 10
- Union County, TN — 10
- Wise County, VA — 10
- Knox County, KY — 11
- Leslie County, KY — 11
The middle area reports 29. The middle half of counties falls between 22 and 41 (the 25th to 75th percentile).
US Counties With the Highest Longest Dry Spell · US Counties With the Lowest Longest Dry Spell
All measures · Explore its pairs · How the US county data works