Assuming you have a lab with strong AC and humidity regulation, there should be no effects of the weather. I wouldn't talk about seasons here since there temporary weather conditions will be more important.

However, most labs in general and university labs in particular have only weak regulation in this sense because cleanroom level condition control is expensive like hell and therefore, you will logically have influence of day-to-day humidity and temperature fluctuations. I know people from other institutes who work a lot with diethyl ether and they simply have to interrupt their research for safety reasons when the temperatures outside exceed 35°C.

So, technically it would be best for the reproducibility of your experiments to have not only a thermometer but also a hygrometer and to note down the humidity during your experimental phase.