Ramah State Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ramah State Wildlife Area clear sky chart from 2005-11-06 to 2025-11-18.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	4 5% 2 5% 4 4 4 4 6% 8% 55%	135488
	Night	4 5% 2 6% 4 4 4 4 6% 7% 55%	132295
Transparency	Day	24% 6% 11% 23% 24% 11%	130480
	Night	26% 6% 11% 24% 24% 9%	128308
Seeing	Day	7% 10% 29% 30% 19% 6%	16973
	Night	6% 6% 34% 38% 14% 2	26954

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	1 6% 2 7% 4 3 3 3 6% 8% 57%	3638
	11th to 20th	Day	1 4 2 5% 5% 4 4 3 6% 8% 58%	3686
	21st to end	Day	2 5% 3 5% 3 3 3 3 4 6% 62%	4510
February	1st to 10th	Day	2 8% 2 5% 4 4 3 3 5% 7% 57%	1855
	11th to 20th	Day	1 4 2 6% 4 5% 4 4 5% 6% 58%	1949
	21st to end	Day	2 6% 3 7% 4 4 3 4 4 6% 58%	1650
March	1st to 10th	Day	1 5% 2 6% 3 3 3 4 4 6% 62%	4500
	11th to 20th	Day	4 8% 3 5% 4 3 4 3 5% 7% 54%	4803
	21st to end	Day	3 6% 2 5% 4 4 4 4 6% 8% 53%	5915
April	1st to 10th	Day	5% 7% 2 5% 3 4 4 4 5% 7% 54%	2400
	11th to 20th	Day	6% 8% 3 6% 4 4 4 4 6% 7% 47%	2371
	21st to end	Day	8% 6% 2 7% 4 5% 4 4 6% 8% 47%	2400
May	1st to 10th	Day	10% 7% 2 6% 4 4 4 3 5% 7% 49%	5808
	11th to 20th	Day	6% 5% 2 6% 4 4 5% 4 7% 8% 50%	6051
	21st to end	Day	7% 5% 2 5% 4 4 5% 5% 7% 10% 47%	6925
June	1st to 10th	Day	5% 4 2 4 4 3 5% 5% 8% 9% 50%	2800
	11th to 20th	Day	4 3 1 4 3 4 5% 5% 8% 8% 54%	2800
	21st to end	Day	3 4 2 5% 5% 4 5% 5% 8% 10% 50%	2800
July	1st to 10th	Day	2 3 1 4 4 4 5% 5% 8% 11% 53%	6339
	11th to 20th	Day	3 2 2 5% 5% 5% 6% 5% 8% 10% 49%	6340
	21st to end	Day	4 4 2 6% 5% 5% 6% 6% 8% 9% 47%	6869
August	1st to 10th	Day	6% 4 2 5% 4 5% 6% 5% 9% 11% 45%	5608
	11th to 20th	Day	3 3 1 5% 4 5% 6% 5% 8% 10% 52%	5366
	21st to end	Day	5% 4 2 7% 4 6% 6% 5% 7% 9% 45%	5984
September	1st to 10th	Day	3 3 1 5% 4 3 4 4 6% 8% 59%	2400
	11th to 20th	Day	5% 2 1 4 3 3 4 4 6% 8% 60%	2333
	21st to end	Day	5% 3 1 4 3 3 4 2 5% 6% 64%	2200
October	1st to 10th	Day	4 3 1 2 2 2 2 2 4 4 75%	3412
	11th to 20th	Day	4 4 2 4 3 3 3 2 5% 8% 63%	3250
	21st to end	Day	4 4 2 3 2 2 2 2 4 5% 70%	3361
November	1st to 10th	Day	2 4 1 3 3 3 3 3 5% 8% 65%	1853
	11th to 20th	Day	2 6% 2 4 3 3 2 2 4 5% 67%	1863
	21st to end	Day	3 6% 1 4 3 3 3 3 5% 6% 65%	1799
December	1st to 10th	Day	1 5% 2 3 2 2 3 2 4 6% 70%	2620
	11th to 20th	Day	2 3 2 4 3 2 3 3 5% 7% 66%	3026
	21st to end	Day	2 5% 2 5% 3 3 4 4 6% 9% 56%	4004
January	1st to 10th	Night	1 7% 3 8% 4 4 4 3 5% 7% 55%	6327
	11th to 20th	Night	1 5% 2 6% 4 4 4 4 5% 7% 59%	6325
	21st to end	Night	1 4 3 7% 4 3 4 3 4 5% 62%	6468
February	1st to 10th	Night	1 7% 3 6% 3 3 3 4 5% 8% 57%	2543
	11th to 20th	Night	2 7% 3 7% 4 4 4 4 5% 8% 50%	2338
	21st to end	Night	2 6% 3 6% 3 3 3 3 4 6% 62%	1980
March	1st to 10th	Night	2 6% 3 7% 3 3 4 3 4 6% 59%	5374
	11th to 20th	Night	5% 9% 3 6% 3 3 3 3 5% 6% 54%	5186
	21st to end	Night	5% 7% 2 6% 4 4 4 3 5% 8% 51%	5039
April	1st to 10th	Night	5% 7% 3 5% 5% 3 3 4 5% 8% 53%	2000
	11th to 20th	Night	7% 9% 3 7% 4 3 5% 3 6% 7% 47%	1977
	21st to end	Night	9% 8% 3 7% 5% 4 4 4 6% 7% 45%	2000
May	1st to 10th	Night	10% 8% 3 5% 4 3 4 3 6% 6% 48%	4156
	11th to 20th	Night	7% 6% 2 6% 4 4 4 4 6% 8% 48%	3848
	21st to end	Night	9% 6% 2 5% 4 4 5% 4 5% 6% 48%	3972
June	1st to 10th	Night	5% 4 2 5% 4 4 5% 5% 7% 10% 51%	1600
	11th to 20th	Night	4 3 1 4 4 4 4 4 7% 7% 57%	1600
	21st to end	Night	4 5% 2 6% 4 5% 5% 5% 7% 9% 49%	1600
July	1st to 10th	Night	4 4 2 5% 4 5% 5% 5% 8% 10% 49%	3640
	11th to 20th	Night	4 4 1 5% 4 5% 6% 6% 8% 11% 45%	3640
	21st to end	Night	4 4 2 6% 5% 6% 5% 5% 8% 9% 46%	3987
August	1st to 10th	Night	6% 6% 2 6% 5% 6% 6% 5% 8% 9% 42%	4201
	11th to 20th	Night	5% 4 2 6% 4 6% 5% 5% 8% 10% 46%	4483
	21st to end	Night	7% 5% 2 7% 5% 5% 6% 5% 8% 9% 41%	4993
September	1st to 10th	Night	5% 4 2 5% 4 5% 5% 5% 6% 9% 52%	2000
	11th to 20th	Night	5% 3 1 4 3 3 4 3 6% 10% 58%	2065
	21st to end	Night	5% 4 1 5% 3 3 4 3 5% 6% 62%	2200
October	1st to 10th	Night	4 3 1 4 2 3 3 2 3 6% 69%	3770
	11th to 20th	Night	6% 4 2 4 3 3 5% 4 6% 7% 57%	3898
	21st to end	Night	3 4 2 5% 3 2 3 2 3 5% 68%	4405
November	1st to 10th	Night	2 4 1 4 2 2 2 3 5% 7% 67%	2665
	11th to 20th	Night	1 4 2 4 2 2 3 3 5% 5% 69%	2692
	21st to end	Night	3 6% 2 5% 3 3 3 3 5% 6% 61%	2600
December	1st to 10th	Night	1 3 1 4 3 2 2 2 4 5% 72%	4568
	11th to 20th	Night	1 4 2 4 3 3 3 3 5% 8% 63%	5181
	21st to end	Night	2 6% 2 6% 4 4 4 4 5% 7% 54%	6974

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	23% 6% 8% 31% 22% 11%	3639
	11th to 20th	Day	22% 7% 10% 22% 28% 11%	3686
	21st to end	Day	23% 4 8% 27% 27% 12%	4510
February	1st to 10th	Day	25% 5% 12% 25% 22% 11%	1855
	11th to 20th	Day	25% 6% 7% 28% 27% 8%	1959
	21st to end	Day	26% 4 7% 20% 25% 18%	1650
March	1st to 10th	Day	20% 6% 7% 16% 31% 21%	4500
	11th to 20th	Day	28% 5% 10% 21% 28% 7%	4803
	21st to end	Day	24% 6% 12% 36% 19% 3	5915
April	1st to 10th	Day	26% 6% 12% 24% 22% 9%	2400
	11th to 20th	Day	32% 8% 11% 21% 18% 10%	2374
	21st to end	Day	31% 8% 13% 25% 20% 3	2400
May	1st to 10th	Day	32% 7% 10% 25% 18% 8%	5808
	11th to 20th	Day	26% 8% 12% 20% 23% 12%	6055
	21st to end	Day	27% 10% 15% 24% 18% 7%	6926
June	1st to 10th	Day	26% 8% 16% 25% 17% 9%	2800
	11th to 20th	Day	23% 7% 11% 19% 24% 16%	2800
	21st to end	Day	24% 8% 13% 20% 23% 13%	2800
July	1st to 10th	Day	21% 7% 11% 18% 26% 16%	6271
	11th to 20th	Day	25% 8% 15% 25% 18% 9%	6265
	21st to end	Day	29% 8% 15% 16% 17% 16%	6671
August	1st to 10th	Day	32% 9% 16% 25% 13% 5%	4081
	11th to 20th	Day	25% 8% 13% 19% 22% 11%	3882
	21st to end	Day	26% 6% 13% 22% 24% 9%	4311
September	1st to 10th	Day	21% 5% 10% 24% 25% 15%	2400
	11th to 20th	Day	19% 5% 10% 18% 30% 18%	2333
	21st to end	Day	20% 4 8% 20% 35% 14%	2200
October	1st to 10th	Day	13% 3 7% 16% 38% 23%	3412
	11th to 20th	Day	21% 3 9% 24% 34% 9%	3250
	21st to end	Day	17% 2 6% 21% 39% 14%	3361
November	1st to 10th	Day	17% 4 10% 25% 28% 17%	1853
	11th to 20th	Day	19% 4 5% 26% 35% 11%	1863
	21st to end	Day	19% 4 9% 21% 30% 17%	1799
December	1st to 10th	Day	17% 3 7% 32% 31% 9%	2620
	11th to 20th	Day	18% 3 7% 30% 31% 10%	3024
	21st to end	Day	23% 5% 9% 28% 25% 9%	4004
January	1st to 10th	Night	27% 5% 7% 29% 24% 7%	6327
	11th to 20th	Night	22% 6% 11% 24% 23% 14%	6325
	21st to end	Night	23% 4 10% 25% 24% 13%	6468
February	1st to 10th	Night	24% 6% 10% 27% 23% 10%	2543
	11th to 20th	Night	30% 5% 11% 27% 19% 7%	2338
	21st to end	Night	22% 5% 7% 24% 26% 15%	1980
March	1st to 10th	Night	24% 5% 8% 13% 36% 14%	5374
	11th to 20th	Night	28% 6% 11% 14% 29% 11%	5186
	21st to end	Night	29% 7% 11% 32% 18% 2	5039
April	1st to 10th	Night	28% 6% 11% 25% 22% 9%	2000
	11th to 20th	Night	33% 6% 11% 23% 19% 7%	1977
	21st to end	Night	35% 8% 12% 25% 16% 4	2000
May	1st to 10th	Night	33% 9% 13% 28% 12% 6%	4154
	11th to 20th	Night	30% 9% 13% 23% 17% 8%	3849
	21st to end	Night	32% 10% 15% 25% 14% 4	3972
June	1st to 10th	Night	25% 10% 21% 24% 14% 7%	1600
	11th to 20th	Night	21% 8% 16% 23% 19% 14%	1600
	21st to end	Night	28% 7% 12% 25% 19% 10%	1600
July	1st to 10th	Night	28% 6% 14% 20% 27% 5%	3600
	11th to 20th	Night	28% 7% 22% 24% 16% 3	3592
	21st to end	Night	31% 8% 16% 15% 20% 10%	3873
August	1st to 10th	Night	40% 11% 16% 19% 10% 4	3052
	11th to 20th	Night	33% 9% 17% 21% 17% 4	3243
	21st to end	Night	27% 8% 15% 28% 17% 5%	3597
September	1st to 10th	Night	27% 7% 11% 21% 23% 11%	2000
	11th to 20th	Night	21% 7% 10% 24% 24% 14%	2065
	21st to end	Night	22% 4 9% 23% 31% 11%	2200
October	1st to 10th	Night	17% 3 9% 18% 35% 17%	3770
	11th to 20th	Night	24% 4 9% 26% 27% 10%	3898
	21st to end	Night	20% 3 7% 25% 30% 15%	4405
November	1st to 10th	Night	17% 3 11% 24% 29% 16%	2665
	11th to 20th	Night	17% 4 8% 27% 32% 13%	2692
	21st to end	Night	24% 4 8% 22% 30% 13%	2600
December	1st to 10th	Night	16% 3 8% 32% 32% 10%	4568
	11th to 20th	Night	21% 3 6% 26% 36% 7%	5182
	21st to end	Night	26% 6% 9% 24% 26% 10%	6974

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	5% 9% 35% 34% 14% 3	300
	11th to 20th	Day	7% 12% 37% 32% 11% 1	300
	21st to end	Day	5% 13% 34% 30% 14% 3	330
February	1st to 10th	Day	4 16% 44% 26% 8% 2	300
	11th to 20th	Day	4 14% 42% 31% 7% 1	300
	21st to end	Day	3 15% 45% 29% 6% 2	249
March	1st to 10th	Day	3 13% 37% 28% 15% 4	300
	11th to 20th	Day	9% 16% 37% 24% 12% 3	407
	21st to end	Day	11% 20% 39% 20% 8% 2	550
April	1st to 10th	Day	9% 19% 38% 24% 9% 2	500
	11th to 20th	Day	12% 23% 39% 18% 7% 2	492
	21st to end	Day	13% 17% 35% 24% 9% 2	500
May	1st to 10th	Day	13% 15% 34% 24% 12% 3	663
	11th to 20th	Day	13% 10% 31% 27% 16% 4	725
	21st to end	Day	8% 12% 31% 27% 16% 5%	789
June	1st to 10th	Day	6% 8% 24% 33% 22% 7%	730
	11th to 20th	Day	5% 8% 28% 32% 21% 5%	730
	21st to end	Day	5% 7% 25% 33% 24% 7%	730
July	1st to 10th	Day	5% 4 18% 34% 30% 10%	721
	11th to 20th	Day	4 3 14% 36% 32% 12%	718
	21st to end	Day	5% 2 15% 33% 32% 14%	785
August	1st to 10th	Day	7% 3 17% 38% 26% 9%	527
	11th to 20th	Day	3 5% 19% 34% 27% 12%	517
	21st to end	Day	4 3 23% 37% 25% 9%	583
September	1st to 10th	Day	4 3 25% 33% 24% 10%	530
	11th to 20th	Day	4 5% 27% 30% 23% 10%	463
	21st to end	Day	5% 7% 22% 26% 27% 12%	330
October	1st to 10th	Day	7% 6% 25% 28% 21% 12%	330
	11th to 20th	Day	3 12% 34% 28% 16% 8%	330
	21st to end	Day	9% 10% 33% 26% 16% 7%	363
November	1st to 10th	Day	5% 11% 32% 28% 18% 5%	330
	11th to 20th	Day	5% 8% 35% 32% 17% 3	321
	21st to end	Day	4 12% 33% 32% 15% 4	300
December	1st to 10th	Day	3 16% 35% 29% 15% 2	300
	11th to 20th	Day	3 12% 40% 29% 15% 1	300
	21st to end	Day	6% 13% 38% 32% 9% 1	330
January	1st to 10th	Night	5% 6% 37% 38% 11% 2	1000
	11th to 20th	Night	5% 8% 39% 36% 10% 2	998
	21st to end	Night	3 5% 41% 39% 10% 1	880
February	1st to 10th	Night	5% 8% 49% 33% 5% 1	800
	11th to 20th	Night	4 8% 51% 29% 7% 1	784
	21st to end	Night	5% 8% 48% 33% 6%	660
March	1st to 10th	Night	5% 8% 42% 37% 7% 1	800
	11th to 20th	Night	9% 6% 39% 36% 9% 1	800
	21st to end	Night	7% 9% 44% 33% 8%	689
April	1st to 10th	Night	9% 10% 45% 30% 6%	600
	11th to 20th	Night	12% 13% 34% 35% 6%	593
	21st to end	Night	12% 14% 34% 31% 8% 1	600
May	1st to 10th	Night	11% 11% 33% 34% 11% 1	600
	11th to 20th	Night	11% 8% 28% 40% 11% 1	591
	21st to end	Night	10% 7% 36% 33% 12% 1	650
June	1st to 10th	Night	5% 6% 29% 42% 17% 2	600
	11th to 20th	Night	5% 4 33% 44% 13% 1	600
	21st to end	Night	5% 4 27% 45% 17% 2	600
July	1st to 10th	Night	7% 3 20% 43% 25% 2	585
	11th to 20th	Night	5% 1 13% 49% 30% 3	582
	21st to end	Night	7% 2 13% 40% 36% 2	657
August	1st to 10th	Night	5% 3 18% 44% 28% 3	597
	11th to 20th	Night	6% 2 17% 51% 22% 2	594
	21st to end	Night	5% 3 15% 48% 27% 3	660
September	1st to 10th	Night	7% 2 18% 50% 20% 4	600
	11th to 20th	Night	7% 3 22% 44% 21% 3	600
	21st to end	Night	7% 3 26% 44% 18% 3	600
October	1st to 10th	Night	7% 6% 33% 33% 16% 4	702
	11th to 20th	Night	5% 6% 33% 38% 15% 3	800
	21st to end	Night	6% 8% 32% 37% 14% 3	971
November	1st to 10th	Night	4 5% 35% 40% 14% 2	1025
	11th to 20th	Night	3 7% 39% 39% 11% 1	1036
	21st to end	Night	6% 9% 34% 37% 13% 2	1000
December	1st to 10th	Night	3 7% 40% 38% 11% 2	1000
	11th to 20th	Night	4 7% 44% 34% 10% 1	1000
	21st to end	Night	6% 10% 42% 33% 9% 1	1100

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