R ggplot2 change geom_bar to a single color

Based on the code and data below, how can I change the bar colors to a single color #0277BD?

I tried scale_fill_manual(values=c("#0277BD")), but it doesn’t work.

Error in `f()`:
! Insufficient values in manual scale. 24 needed but only 1 provided.

I also tried scale_fill_brewer(palette="Blues"), but this doesn’t work either.

Warning message:
In RColorBrewer::brewer.pal(n, pal) :
  n too large, allowed maximum for palette Blues is 9
Returning the palette you asked for with that many colors

Data:

df = structure(list(CITYNAME = c("a", "b", "c", 
    "d", "e", "f", "g", 
    "h", "i", "j", "k", 
    "l", "m", "n", "p", "q", 
    "r", "s", "t", "u", 
    "w", "x", "y", "z"), AvgTMin = c(20.28, 
20.38, 20.08, 20.35, 20.38, 20.76, 21, 21.21, 20.45, 20.21, 21.18, 
20.29, 20.61, 20.44, 20.95, 19.75, 20.58, 20.32, 21.05, 20.28, 
20.09, 20.15, 20.73, 20.12)), row.names = c(NA, 
    -24L), class = c("tbl_df", "tbl", "data.frame"))

Code:

# Plot in Fahrenheit

    df %>% mutate(AvgTMin = AvgTMin * (1.8) + 32) %>% # Convert from C to F
          ggplot(aes(x = reorder(CITYNAME,AvgTMin), y = AvgTMin, fill = CITYNAME)) +
          geom_bar(stat="identity") +
          coord_cartesian(ylim = c(60,70.3)) +
          theme(axis.text = element_text(size = 14)) +
          geom_text(aes(label=sprintf("%0.2f", AvgTMin)), vjust=-0.2, size = 4) +
          labs(x = NULL, y = "Avg. Min. Temperature \u00B0F") + 
          theme(axis.text.x = element_text(angle = 90),  legend.position = 'none') +
          ggtitle("1980-2021 Temperature Trend By City")

>Solution :

You can specify the single color in the geom_bar call:

  geom_bar(stat="identity", fill = "0277BD") +

In your code you can also delete the fill aesthetic in the ggplot call unless you need it for other layers.