Culex tarsalis
In 3 days ~10%
Culex tarsalis, also known as Western Encephalitis Mosquito, is a mosquito species that appears across North America. The species has black and white banding on the legs. The species is a major vector of Saint Louis encephalitis and Western equine encephalitis virus in the western USA. It is also a confirmed vector of West Nile virus.
In California urban environments, the abundance of Culex tarsalis increases following rainfall, and it has been identified as a potential vector not only for zoonotic viruses but also for avian malaria parasites, particularly Plasmodium species that infect wild birds. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Salt Lake City | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Mexico City | 🇲🇽 México | |
| 5 | Austin | 🇺🇸 United States | |
| 6 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Western Encephalitis Mosquito sighting in San Francisco on a given day, based on 17 verified sightings from GBIF citizen-science data. It is the 373rd most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Western Encephalitis Mosquito in San Francisco on a given day, so our monthly data shows no clear season.
Among the best
Of the 6 cities where we can rate Western Encephalitis Mosquito sightings, San Francisco ranks 6th at under 5%, level with the leaders once rounded. The best odds are in Sacramento (United States, under 5%), Salt Lake City (United States, under 5%) and Dallas (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Western Encephalitis Mosquito is recorded against all the insects logged in San Francisco (17 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
