Culex tarsalis
In 3 days ~10% in a week ~20%
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 Sacramento on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 200th most-seen of the 386 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
September and October
In those months about 10% of wildlife watchers report a Western Encephalitis Mosquito in Sacramento on a given day, against under 5% in November to August, the lowest months. Those are among Sacramento's driest months, with about 15 mm of rain a month against 120 mm in December.
Yes
Of the 6 cities where we can rate Western Encephalitis Mosquito sightings, Sacramento has the highest daily chance: under 5%. Next come 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 Sacramento (22 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.
