[![my tryout build, the uno you see is just the "programmer" script runs on the Attiny85][1]][1]


 [1]: https://i.sstatic.net/JkBGv.jpg


Ok i tried something like that for myself and thanks to this and ..many other posts and forums/videos i could make myself something that works but with a little other setting like in the start post (other libs ect)

in my case the main reason for the "1" output on the oled was this:
 
 float hu = (DHT.humidity, 1); //original
 
 float hu = (DHT.humidity); //what worked for me 


Maybe you can figure out more Problems, my code is shure not perfekt! But maybe it helps someone for a vew steps

 #include <dht.h>
 #include <U8x8lib.h>
 #define DHT11_PIN 1
 dht DHT;
 int temp = 0;
 int humi = 0;
 char strTemp[4]; 
 char strHumi[4];
 
 U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/* clock=*/ 2, /* data=*/ 0, /* reset=*/ U8X8_PIN_NONE); // Digispark ATTiny85 Pin 0 Data, Pin 2 clock
 
 
 
 void setup(void)
 {
 
 u8x8.begin();
 u8x8.setPowerSave(0); //enegergiesparen 0 aus
 
 }
 
 void loop(void)
 {
 
 int chk = DHT.read11(DHT11_PIN);
 
 temp = (DHT.temperature);
 humi = (DHT.humidity);
 
 
 
 u8x8.setFont(u8x8_font_chroma48medium8_r);
 u8x8.drawString(0,0,"~~~~~~~~~~~~~~~~");
 u8x8.drawString(0,1,"Temperatur");
 u8x8.drawString(1,2,( itoa(int(temp), strTemp, 10)));
 u8x8.drawString(4,2,"Grad Celsius");
 u8x8.drawString(1,3,"--------------");
 u8x8.drawString(0,4,"Luftfeuchtigkeit");
 u8x8.drawString(1,5,( itoa(int(humi), strHumi, 10)));
 u8x8.drawString(4,5,"Prozent");
 u8x8.drawString(0,6,"~~~~~~~~~~~~~~~~");
 delay(200);
 }