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The Num lock should always be enabled. If it is disabled when you are attempting an alt code, it may cause errors or unexpected results in some applications. For example, Alt+4 could be interpreted as Alt +, ← which causes the browser to go back if the Num lock is disabled.
If your laptop keyboard doesn't have a separate NumPad, you should hold FN button with Alt button while typing the code.
This method does not work for Linux system, but it is possible to use Unicode.

Weather Symbol

Weather symbols are used to indicate different conditions of weather such as fog, snow, rain and are usually used for weather forecasting. The first commercial weather map was put out by the U.S. weather bureau in 1910. The icons we know emerged in the 1970s. The symbols can also convey intensity. For example, a single dot represents rain, and multiple dots represent heavy rain. Alt code is a simple way to insert different weather symbols in the text. For example, the sun symbol in a text could mean summer; it may also indicate the warmth. Cloud with rain symbol indicate rainy weather; it may have the symbolic meaning of crying.

How to use and type Weather symbol code?

If your keyboard contains separate NumPad, you should be sure that it is enabled. If it is not, press the Num Lock key to activate it then press hold down the Alt key on the left side. Type the number that represents that character or the symbol you want to insert and then release the insert key.
For example, for the greek letter omega Ω press and hold Alt and the type 0234 and then release.
There is another method that works only for word documents. In this method, you should type the characters first then press Alt and X. For example ( 0234 + Alt + X for greek letter omega ).
If you have a keyboard that doesn't have NumPad here is what will work for you. Find the Function key ( FN ) then presses and hold the function key while holding press and release Num LK key; then release FN key. This method will activate the numeric keypad in your laptop.
Then do the same steps as in the previous example.
Notice that in IBM code you don't use 0 (Alt + 255 ) before the code which is different from the windows generator that requires to add 0 (Alt + 0255 ) before the code.

Table of Symbols and Codes

Symbol	Title / Description	Code / HTML Code
🌡	Thermometer	#x1F321;
☂	Umbrella Rainy Weather	#x2602;
🌪	Cloud With Tornado Twister	#x1F32A;
☈	Thunderstorm	#x2608;
⛈	Thunder Cloud And Rain Thunderstorm	#x26C8;
🌩	Cloud With Lightning	#x1F329;
☃	Snowman Snowy Weather	#x2603;
🌦	White Sun Behind Cloud With Rain Showers	#x1F326;
🌁	Foggy	#x1F301;
🌨	Cloud With Snow Snow, Snow Showers	#x1F328;
☀	Black Sun Clear Weather	#x2600;
☉	Sun	#x2609;
☄	Comet	#x2604;
⛇	Black Snowman Heavy Snow	#x26C7;
☼	White Sun Sunny	#x263C;
🌧	Cloud With Rain	#x1F327;
⛄	Snowman Light Snow	#x26C4;
🌤	White Sun With Small Cloud Mostly Sunny	#x1F324;
🌥	White Sun Behind Cloud Mostly Cloudy	#x1F325;
☔	Umbrella Showery Weather	#x2614;
⛅	Sun Behind Cloud Partly Cloudy	#x26C5;
☇	Lightning	#x2607;
🌫	Fog	#x1F32B;
☁	Cloudy Weather	#x2601;