You will need to adjust the treatment of pool chemicals depending on the season and weather conditions.
Cold temperatures:
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Less chlorine is needed during the winter especially as water temperatures drop below 55°F. There are fewer living organisms in the water requiring lower demand for sanitizer. As the temperature of water drops it can dramatically change the pool chemistry to a more corrosive nature. This is when you may want to add calcium chloride.
Warm temperatures:
More chlorine is required as higher temperatures fuel algae and bacteria growth along with the longer daylight hours. It will be critical to keeping it sanitized with chlorine as more people will be using the pool.
Heavy rain:
Rain can cause several issues. The leaf skimmer may not be as effective if the water level is above the intake leaving floating debris behind. Also, rainwater is acidic and pools require the pH to be raised after heavy rainfall with pH Increaser.
You will want to also check the Total Alkalinity since heavy rain dilutes alkalinity by 5 or 10 ppm in a day. Adding Baking Soda is an inexpensive way to boost the alkalinity so the water won’t corrode pool surfaces, or metal and rubber parts within the pool system.
Rain can be helpful in diluting too much calcium hardness which causes scale on pool surfaces when levels are excessive
Drought:
Be sure to add water frequently to replenish loss from evaporation. In our hot summer climate, 300 ppm calcium hardness should be the minimum level. Be sure to provide Cyanuric Acid, which is like sunscreen for your chlorine. It is also called stabilizer which will make chlorine more effective and more stable. Just be sure to add more after heavy rain.
Springtime:
Pollen & Algae blooms can thrive this time of year. Be sure to run your pool pump at least 8-12 hours a day and clean the filters to thwart yellow pollen film from taking over the pool surface.
March and April coincide with the first application of yard fertilizer but recognize algae feeds off phosphates and nitrates from any accidental fertilizer that washes into your pool.
As long as your pH is not too high and with adequate chlorine levels, you should be able to minimize algae growth as the water begins to warm up in a properly circulating swimming pool.