NRMA Insurance data has revealed the most storm-affected areas of the Murray-Murrumbidgee region, with Griffith topping the list, followed by Wagga, Lake Albert (a suburb of Wagga), Leeton and Tumbarumba in equal fourth and Albury rounding out the top five.

The information from NRMA showed NSW experienced one of is most intense storm seasons in years, with 61 per cent of all home claims coming from storm damage in 2018-19.

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Forty per cent of NSW residents also reported they didn't prepare their home in time for storm season.

That season is now upon us and as the number show, Leeton and Griffith, are not immune to severe damage during spring thunderstorms.

In the past, homes have been damaged by storms, with State Emergency Services personnel from both towns often called on to assist.

NRMA insurance manager for safer communities Alex Mazzoni said with more severe storms hitting the state it was important to be prepared.

"We know two in five residents are yet to take steps to prepare their home for severe weather, so we're joining the SES to urge everyone to take the time to prepare their homes for storm season," he said.

Spring thunderstorm also impact on the health of many residents, which means preparation in that area is also vital.

Murrumbidgee Local Health District clinical nurse consultant, respiratory Robyn Paton said it was important residents take charge of their health during storm season.

"They have got (to have) an asthma action plan," she said.

"That they know what to do as their condition worsens. Now, 98 per cent of those people that will be affected will have sinus and hayfever symptoms already.

"Preventative medication needs to be taken.

"If you feel you are getting worse, call an ambulance. Don't try and drive yourself to a hospital."

Ms Paton said there were high rates of asthma in the Murrumbidgee. This condition can be triggered by thunderstorms.

"Yes, there are (high rates), particularly associated with these (events)," she said.

In this district the amount of pollen in the air is calculated each day during storm season.

There is now an alert system residents with asthma and associated issues can subscribe to to be aware of the weather pattern and warnings each day.

Sign up by visiting science.csu.edu.au/asthma.

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