there is no circuit it is just the output of LM35 connected to oscilloscope .Can you show us the circuit to see how you interfaced LM35.
LM35 may be interfered by the circuit to which it is connected.
Show me that circuit? Is that an ADC?
Since the solar panel temperature is unlikely to change faster than a couple of 'C per second, that's a max voltage slope of 20mV/sec on the LM335 output pin. You could probably use a 100uF or 1000uF cap with no issues.A resistor in series with the output and a capacitor to ground at the end of the wire to form a low-pass filter should help. Try 1k? and 1?F to start.
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