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Rainfall as an Abiotic Factor at Race Rocks

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Today's Rain

The past week's rainfall at Race Rocks. Recorded by a Davis Instruments tipping bucket rain gauge.
rain day rain week rain month
Today's Rainfall: measured in mm. Rainfall in the past week. Click on the above graphs for larger versions The three graphs above represent historical records of rainfall at different time scales These graphs are made possible by the website victoriaweather.ca
Current Rain Rate Storm Rain Total Monthly Total Rain Yearly Total Rain
RAINFALL ARCHIVES:

seasonal rainfall

Seasonal Precipitation at Race Rocks

The UVIC School Based Weather Station
has provided this new visualization of seasonal precipitation.

Currently they are showing monthly total rain in a polar plot with the months arranged clockwise around a circle. The seasonality of the rain fall on Vancouver Island becomes very evident when it is displayed in this way. The largest monthly value is written in the bottom left corner. The number of daily totals (observations) is written in the bottom right. The concentric circles, marked with grey numbers, show the fraction of the annual rainfall in percent that each month represents.

rain for 2012
2012: Monthly Totals are shown. ( Includes data and graphs at this site.)
rain for 2011
2011: Monthly Totals are shown. ( Includes data and graphs at this site.)
rain for 2010
2010: Monthly Totals are shown. ( Includes data and graphs at this site.)
rain for 2009
2009: Monthly Totals are shown. ( Includes data and graphs at this site.) Note : Equipment failure produced incomplete records Jan to July.. Change of software in July -Aug solved the recurring problem.
rain for 2008
2008: Monthly Totals are shown. ( Includes data and graphs at this site.) Note: equipment failure gives blank records for several days of the year. see linked table
rain for 2007
2007: Monthly Totals are shown. ( Includes data and graphs at this site.) Note : the instrument was not working in February March and part of April of 2007
2006: Monthly Rain Totals (includes data and graphs for part of 2006:
Records of rainfall from 1985 to February 1996 may be found on the Environment Canada Website Search that website for total rainfal during that period . Also you can find Snowfall there. Click on British Columbia/advanced search/ then enter Race Rocks in the Search by Station Name section. Use the pull down menues to find the year,month or day of interest.
In order to do further statistical analysis of these data use the following link:

Last 24 hr raw rainfall data

Week raw rainfall data:

Month raw rainfall data:

Drought Levels and Probability Density Functions
Drought levelsHistograms for Drought Levels at Race Rocks:
These histograms are provided by the UVIC School- based Victoria Weather Station Network.They show consecutive days without rain at Race Rocks.. Each event is calculated by de terming the number of dry days between two days that record rain. Long periods between rain events are considered droughts. The height of each bar gives the number of events with a particular length of dry spell between days with rain as percentage of the total number of events with at least one dry day between days with rain. All events are allocated to the season in which they start.
The plots are shown for the entire year and for each season. The seasons are defined as follows:
• Winter--January, February, March
• Spring--April, May, June
• Summer--July, August, September
• Fall--October, November, December"
Probability Density Functions of RainProbability Density Functions of Daily Rain at Race Rocks :
By year and by season
.

These plots are provided by the UVIC School- based Victoria Weather Station Network.They show "the Probability Density Functions of daily total rain at Race Rocks. The blue bars give the histogram of daily rain values (greater than zero) with bins of 1 mm. The red curve is the best fit to the histogram using a three-parameter gamma function. The orange and green vertical lines give the 95th and 99th percentile respectively. The number of days of rain and the percent of the total number of events that this represents are given in the last line of the legend.





The plots are shown for the entire year and for each season. The seasons are defined as follows:
• Winter--January, February, March
• Spring--April, May, June
• Summer--July, August, September
• Fall--October, November, December"

Evapotranspiration
ET - Evapotranspiration
This is the amount of moisture evaporated off the surface.  Using this data with rainfall, one can determine moisture deficits/surpluses.
It has been calculated based on the temperature/rainfall data as measured at 2 metres above the rock surface at Race Rocks.

Also see this reference in the temperature file:

The Adaptations and Response of Organisms to the Abiotic factor of Rainfall
goose drinking Canada Geese are dependant on the availability of fresh water at Race Rocks. During the winter, the higher level rock pools are refreshed by rainfall. There is no other natural source of water on the island. By the time their eggs hatch in June, most of the pools have dried up, so they have to take their young off the island and over to the mainland. (Photo by PB)
weteagle
This slide show presents some of the behaviours of juvenile bald eagles in very wet weather.( Photo by PB)
hatching
In this movie of the Black oystercatcher hatching, half way through the day, rain falls at Race Rocks and the oystercatcher settles down to protect the newly hatched chicks.
fescue grass The availability of water for vegetation on Race Rocks, has major implications for the species of plants that can survive on the island. Not only do they have to survive dessication from salt spray, but abundant water in the winter months and almost a total lack of water from June to September. This file shows some of the vegetation that is resistant to the drought.
Race Rocks Islands Go to this exercise on the Water Cycle along with other biogeochemical cycles.
July 2007 rainfallNEWS ITEM:
Global warming already changing rainfall... Nature , July 23 2007
Rainbow West of Race Rocks
Rainbow West of Great Race Rocks from the remote camera 5. Image byGarry Fletcher,
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