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The TMP36 is a low cost temperature sensor

float voltage = analogRead(temperaturePin) * 5.0 / 1023.0;
float temperatureC = voltage * 100 - 50;
float temperatureF = voltage * 180 - 58;

analogRead(temperaturePin)	temperature [°C]	temperature [°F]
140	18.43	65.17
141	18.91	66.05
142	19.40	66.93
143	19.89	67.81
144	20.38	68.69
145	20.87	69.57

At 5.0V and a 10 bit ADC the resolution is 0.49°C (0.88°F)

float voltage = analogRead(temperaturePin) * 3.3 / 1023.0;
float temperatureC = voltage * 100 - 50;
float temperatureF = voltage * 180 - 58;

analogRead(temperaturePin)	temperature [°C]	temperature [°F]
210	17.74	63.94
211	18.06	64.52
212	18.39	65.10
213	18.71	65.68
214	19.03	66.26
215	19.35	66.84

At 3.3V and a 10 bit ADC the resolution is 0.32°C (0.58°F)