Like I said, I've been to Maine. 70% is no where near high for Maine. Cushman Competition is in Maine.

https://www.currentresults.com/Weath...y-by-month.php

Average relative humidity (%) for Caribou, Maine Daily
Morning Afternoon 70 January 75 66 71 February 74 62 71 March 76 59 74 April 75 56 69 May 74 52 68 June 78 54 77 July 83 58 79 August 86 60 82 September 87 61 82 October 86 64 85 November 85 73 79 December 80 73 76 Annual 80 61 Average relative humidity (%) for Portland, Maine Daily
Morning Afternoon 67 January 73 59 65 February 73 57 66 March 73 58 67 April 72 57 71 May 75 60 75 June 79 63 75 July 81 63 76 August 84 63 77 September 85 64 74 October 84 63 73 November 81 64 70 December 77 63 71 Annual 78 61

Highest and Lowest Humidity

Below are the monthly and yearly averages for maximum and minimum humidity levels in Maine. The hours when a month's highest and lowest humidity readings usually occur are given in local standard time.
Daily high and low relative humidity (%) averages in Caribou, Maine High Time
Low Time 74.8 7 am January 64.9 1 pm 75.5 4 am February 61.4 1 pm 79.2 4 am March 58.8 4 pm 84.4 4 am April 55.5 4 pm 84.8 4 am May 51.5 4 pm 86.4 4 am June 54.3 4 pm 92.5 4 am July 57.9 4 pm 95.0 4 am August 60.0 4 pm 93.7 4 am September 61.2 4 pm 90.8 4 am October 62.6 1 pm 89.0 4 am November 70.9 1 pm 83.2 4 am December 70.5 1 pm 85.6 4 am Annual 61.1 1 pm

Daily high and low relative humidity (%) averages in Portland, Maine High Time
Low Time 73.4 7 am January 57.9 1 pm 73.1 7 am February 55.9 1 pm 74.2 4 am March 56.0 1 pm 78.6 4 am April 53.8 1 pm 85.2 4 am May 57.6 1 pm 89.5 4 am June 60.4 1 pm 90.3 4 am July 60.0 1 pm 90.2 4 am August 60.0 1 pm 89.2 4 am September 59.9 1 pm 84.7 4 am October 57.8 1 pm 80.5 7 am November 60.7 1 pm 77.2 7 am December 60.5 1 pm 82.0 4 am Annual 58.4 1 pm

But hey, I'm sorry. You've obviously got this all figured out.