In Horsham, those looking to rent a self-storage unit can choose between a regular storage and a climate-controlled unit, for storing a musical instrument. 
Apparently, the weather and climate in West Sussex is generally agreeable. Winter in Horsham can be very cold and windy while summers are warm and very humid, keeping a musical instrument in a storage unit still requires extra attention.
About the Average Climate and General Weather Conditions in Horsham, West Sussex
Summers in Horsham are regarded as warm with temperatures rarely falling below 25 degrees Celsius, while humidity can be as high as 80%. Thankfully, Horsham summers are short, lasting only about 2.9 months, starting from mid-June to mid-September.
As the cool season starts to set in, the days are often partly cloudy but with just the right amount of humidity, with moisture being maintained at ideal levels of between 35 to 60 percent,
Winter in Horsham starts in mid-November to last up to mid-March, with the month of February having the coldest temperature at an average low of below 5 degrees celsius. A typical winter in Horsham is very cold as it is often windy, with temperatures prevailing daily at less than 10 degrees centigrade.
Take note of these changes in weather conditions especially if you are using a storage facility in which to keep your musical instruments and other belongings.
Some Pointers to Consider When Storing Musical Instruments in a Self-Storage Facility
Bear in mind that monsoon or rainy seasons are that time of year when you need to give extra attention to the musical instruments you stored in a commercial storage unit. These are the periods when a great deal of moisture is in the air. In a non climate-controlled storage unit, moisture can wreak havoc on your guitars, pianos and other stringed and woodwind instruments.
Although not visible, high levels of moisture in indoor air cause the wood components to expand. As wood becomes swollen the tonality of instruments that depend on shape, like guitars, will likely change. The strings and keys of a piano will also be affected once the wood components expand.
Experts give advice that at the very start of the rainy season in your geographical location, keep a close eye on your musical instruments. Primarily because that’s when things will start to go awry. Indian saxophonist Ryan Sadri commented that certain problems take place because the pads, reeds, springs and strings are susceptible to the effects of moisture.
Musicians give advice for newbie musicians to use drying agents typically used on appliances kept in rooms that are not climate-controlled.
Other recommendations include investing in a waterproof case in case you won’t be able to wipe the instrument daily.
Additionally, placing a silica sachet inside the case can help reduce the moisture, as the silica gel will absorb the water vapor.