Hummingbird Departures 1986-2021

Cathy Burgess has been recording the arrival and departure dates for red throated hummingbirds since 1986. The departure date for 2021 was observed to be September 18.

Here is a graph of her data. On a trend line basis the hummers are leaving a week later than they were 35 years ago. A bit more commentary can be found under the Climate Change Signals tab

Website mobile device issues

Dear followers all,

it recently came to my attention that although laptop versions of this website generally worked ok, the mobile versions, such as for an iphone or ipad, did not show many of the charts and pictures.

This, hopefully, has now been remedied.

Please, if you note any malfunctions, it would be highly appreciated if you would let me know.



2020 Lake Partner Program Phosphorus Report for the Kawarthas

The Kawartha Stewards Association (KLSA) recently published this report on phos in their set of lakes. (Chandos is not included).

These lakes are flow-through, meaning that one flows into another, and so phosphorus levels in one lake can affect levels in the downstream lake. It also means that the levels can vary widely.

On a comparative basis, phosphorus levels in Chandos are in the 10 µg/L range,, whereas the Kawartha lakes reported vary widely from 5 to 25.

Secchi Depths at Chandos are in the 5-6m range, whereas in the Kawartha Lakes they range from 2 to to 7.

For more information regarding Chandos, please see the Trophic Status tab, or the Phosphorus tab.

Gilmour Bay Namesake

Gilmour Bay was most likely named after the Gilmour Bay Lumber Baron family from Trenton.

If you have 66 minutes or so, it is very informative to watch the Youtube video “Lumber Baron- The Gilmour Years” at

The last 5 minutes or so has a really hilarious sketch called “the sawmill” -very chaplinesque.

We are most interested in finding out more about the Gilmour Bay lumbering operations.

Chandos lake appears in the map below, but is unnamed. Of course, before 1935 it was called “Loon Lake”.

Radon – What is it and where does it come from?

updated 28 May 2021

The recent interest in the radon health concern has resulted in some questions about radon’s origins. As we know, there is a concern about radioactive radon gas in dwellings, especially those in the Canadian Shield, such as those at Chandos.  Where does this radon come from?  This note attempts to be a bit of a primer on the subject.

The decay of uranium-238 into the radioactive gas radon-222.

Continue reading “Radon – What is it and where does it come from?”

Radon at Chandos

updated May 21, 2021

Radon is the second leading cause of lung cancer, after smoking, but is first amongst non-smokers. Radon is a byproduct of the natural decay of uranium, which is a common element in the Canadian Shield. It is a radioactive gas that seeps up from the ground and enters the dwelling though cracks in concrete, open crawl spaces, and even through the water supply from a well. A well-ventilated dwelling may dilute the radon to a safe level, but a “tight” dwelling will allow it to accumulate and build up to hazardous levels.

Continue reading “Radon at Chandos”