Recent Minimum and Maximum Temperatures in Helena, Montana
Average daily temperatures in Helena, Montana, including the 9 year minima and maxima. Due to the possible presence of missing data c.f. the actual day counts involved in the calculations. Keep in mind that the "raw" daily data represent average day temperatures already. The minima and maxima regard thus the coolest and warmest days experienced over the past 9 years rather than the coldest and hotest temperatures reached during that period.
| January | February | March | April | May | June | July | August | September | October | November | December | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | -18 -5 7 | -26 -3 8 | -13 -1 6 | -2 5 10 | 1 8 16 | 6 15 20 | 11 21 26 | 15 21 27 | 7 17 24 | 6 12 18 | -11 2 9 | -11 -1 7 |
| 2 | -16 -6 5 | -32 -3 7 | -14 -1 7 | -10 3 10 | 4 9 18 | 9 14 20 | 11 20 26 | 18 22 27 | 10 17 24 | -0 11 21 | -10 2 11 | -13 -2 6 |
| 3 | -19 -7 7 | -32 -3 6 | -10 -0 8 | -6 3 13 | 4 9 19 | 9 14 21 | 14 20 27 | 16 21 27 | 9 18 24 | 1 10 18 | -8 2 9 | -13 -3 6 |
| 4 | -21 -6 7 | -19 -2 4 | -11 -1 9 | -2 5 10 | 3 10 16 | 8 15 22 | 14 20 26 | 15 21 24 | 11 18 24 | 2 9 22 | -9 3 13 | -11 -3 8 |
| 5 | -28 -5 7 | -10 -1 8 | -15 -1 9 | -6 5 12 | 2 10 17 | 10 16 21 | 14 20 27 | 14 20 25 | 10 18 22 | -2 8 16 | -10 3 13 | -14 -4 10 |
| 6 | -30 -6 4 | -11 -1 7 | -16 -3 10 | -6 5 14 | 0 10 15 | 8 15 22 | 14 21 29 | 15 21 26 | 9 16 24 | 0 8 16 | -10 3 13 | -15 -4 5 |
| 7 | -24 -4 6 | -12 -2 7 | -17 -3 7 | -3 6 13 | 2 10 17 | 6 13 22 | 15 21 29 | 16 22 27 | 10 16 23 | 2 10 16 | -8 3 19 | -21 -5 3 |
| 8 | -24 -3 10 | -16 -3 4 | -19 -2 12 | -6 5 12 | 2 10 17 | 5 14 24 | 16 21 28 | 13 21 26 | 10 16 22 | 1 10 16 | -8 3 12 | -26 -7 3 |
| 9 | -19 -3 6 | -18 -3 9 | -18 -0 14 | -4 5 14 | 2 10 18 | 6 13 22 | 15 21 26 | 12 20 25 | 11 15 21 | -4 9 14 | -7 2 8 | -24 -6 4 |
| 10 | -20 -5 7 | -15 -4 1 | -15 1 12 | -5 5 11 | 1 9 16 | 5 13 20 | 17 21 26 | 13 21 26 | 12 16 21 | -9 7 14 | -12 0 6 | -17 -4 6 |
| 11 | -23 -6 8 | -17 -4 4 | -18 2 11 | -7 5 13 | 5 9 14 | 6 13 20 | 14 21 26 | 14 21 27 | 9 15 19 | -7 8 18 | -16 0 8 | -21 -3 12 |
| 12 | -29 -8 5 | -18 -4 7 | -8 3 14 | -4 6 13 | 2 11 19 | 8 14 18 | 15 22 28 | 16 20 27 | 7 16 21 | -7 7 13 | -12 2 13 | -24 -3 6 |
| 13 | -30 -5 9 | -20 -2 8 | -13 3 13 | 1 8 14 | 3 12 23 | 9 16 20 | 15 22 30 | 11 20 25 | 10 15 20 | -2 8 15 | -9 3 15 | -19 -3 8 |
| 14 | -26 -4 6 | -17 -3 7 | -13 3 11 | -5 7 16 | 5 13 20 | 12 16 22 | 15 22 29 | 14 21 27 | 11 15 20 | 2 9 15 | -13 2 9 | -23 -3 8 |
| 15 | -27 -3 7 | -11 -2 10 | -8 3 10 | -4 5 15 | 7 13 18 | 12 16 21 | 17 23 27 | 14 20 28 | 9 15 21 | 3 8 13 | -11 0 9 | -23 -3 9 |
| 16 | -21 -4 4 | -15 -1 6 | -3 4 10 | -3 6 15 | 8 14 22 | 9 16 23 | 10 22 28 | 13 20 27 | 5 15 23 | 1 7 14 | -11 2 10 | -23 -3 6 |
| 17 | -18 -5 7 | -21 -1 5 | -12 3 10 | -2 7 13 | 7 14 23 | 8 17 22 | 15 22 28 | 12 19 24 | 4 14 22 | 1 8 18 | -12 1 9 | -19 -2 7 |
| 18 | -21 -4 3 | -21 -2 5 | -9 2 11 | 1 7 15 | 5 14 22 | 11 16 24 | 17 23 29 | 14 19 27 | 6 14 23 | 3 9 15 | -8 2 8 | -18 -5 5 |
| 19 | -20 -3 4 | -15 -1 10 | -8 3 10 | 0 7 16 | 4 13 24 | 12 16 24 | 17 23 30 | 13 20 27 | 4 13 22 | 2 8 15 | -16 -0 14 | -21 -6 7 |
| 20 | -16 -3 5 | -16 -1 8 | -13 2 9 | -9 7 14 | 8 14 22 | 9 15 22 | 17 22 30 | 16 20 25 | 5 12 18 | 1 7 14 | -16 -1 11 | -23 -6 4 |
| 21 | -22 -4 3 | -12 -1 6 | -15 4 9 | -7 7 17 | 7 13 18 | 9 16 23 | 18 22 28 | 16 20 25 | 3 11 18 | 1 7 21 | -18 -1 8 | -25 -6 3 |
| 22 | -20 -5 3 | -10 1 13 | -10 4 12 | -3 8 17 | 5 12 20 | 11 18 26 | 17 23 29 | 14 20 25 | -1 11 18 | 1 6 13 | -18 -2 6 | -20 -7 4 |
| 23 | -16 -5 6 | -17 -1 6 | -8 3 11 | -0 8 17 | 3 11 22 | 10 17 25 | 17 23 30 | 13 20 27 | -1 12 19 | -3 6 17 | -21 -2 10 | -23 -9 7 |
| 24 | -17 -6 5 | -20 -2 6 | -15 2 12 | -2 8 19 | 5 12 22 | 12 18 25 | 19 23 29 | 14 20 24 | 3 12 18 | -3 5 11 | -21 -2 10 | -20 -7 4 |
| 25 | -24 -7 7 | -23 -3 8 | -18 2 13 | 3 9 17 | 7 12 23 | 13 18 26 | 18 22 25 | 14 19 24 | 7 13 20 | -4 5 13 | -10 -0 7 | -17 -6 3 |
| 26 | -23 -6 4 | -20 -5 5 | -6 3 10 | 4 9 16 | 4 13 20 | 12 18 24 | 16 23 27 | 13 20 24 | 6 14 24 | -4 5 11 | -13 -1 10 | -25 -7 4 |
| 27 | -26 -6 8 | -18 -3 8 | -7 3 10 | 2 9 19 | 3 13 20 | 12 19 24 | 20 23 28 | 13 20 24 | 3 13 20 | -1 5 17 | -15 -2 3 | -17 -5 4 |
| 28 | -25 -7 4 | -20 -2 11 | -10 4 9 | -1 8 16 | 5 13 21 | 11 19 24 | 18 23 28 | 14 20 26 | 3 13 20 | 1 6 11 | -19 -2 8 | -20 -5 8 |
| 29 | -27 -5 5 | -20 -3 3 | -8 3 13 | -2 7 16 | 6 13 26 | 14 20 26 | 17 23 29 | 12 20 24 | 10 14 20 | -6 5 11 | -21 -2 7 | -20 -5 7 |
| 30 | -31 -4 6 | -4 4 12 | -0 7 16 | 6 13 20 | 11 20 26 | 14 23 27 | 10 19 23 | 7 13 21 | -10 3 10 | -9 -1 10 | -15 -5 7 | |
| 31 | -29 -3 4 | -2 6 17 | 7 14 22 | 14 22 30 | 9 18 25 | -12 2 13 | -19 -5 6 |