Fort Steele Resort & RV Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Steele Resort & RV Park clear sky chart from 2005-11-06 to 2024-12-02.

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	6% 9% 3 9% 6% 5% 6% 5% 7% 8% 37%	105697
	Night	6% 12% 4 10% 6% 5% 5% 4 6% 7% 35%	102505
Transparency	Day	41% 10% 17% 19% 10% 2	105455
	Night	43% 10% 18% 19% 8% 2	102393
Seeing	Day	15% 9% 24% 29% 18% 5%	15251
	Night	13% 5% 21% 39% 20% 2	24365

By Month

Percentage Cloud Cover NW (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	5% 19% 11% 20% 8% 7% 7% 4 6% 6% 8%	2219
	11th to 20th	Day	6% 18% 5% 11% 6% 4 5% 4 6% 7% 27%	2515
	21st to end	Day	7% 15% 6% 13% 9% 8% 8% 5% 7% 7% 15%	2794
February	1st to 10th	Day	4 12% 5% 13% 9% 6% 7% 6% 9% 8% 21%	1520
	11th to 20th	Day	3 12% 5% 14% 8% 6% 6% 6% 10% 7% 23%	1683
	21st to end	Day	3 12% 4 12% 9% 8% 8% 5% 8% 7% 23%	1570
March	1st to 10th	Day	3 13% 4 13% 6% 7% 7% 5% 7% 8% 28%	3138
	11th to 20th	Day	3 9% 3 10% 7% 5% 6% 6% 7% 7% 36%	3362
	21st to end	Day	7% 14% 5% 13% 7% 7% 6% 5% 7% 8% 21%	3997
April	1st to 10th	Day	6% 13% 6% 10% 7% 6% 7% 5% 6% 8% 27%	2280
	11th to 20th	Day	6% 13% 5% 11% 7% 6% 5% 5% 6% 8% 29%	2414
	21st to end	Day	8% 13% 4 10% 7% 6% 6% 4 6% 7% 30%	2470
May	1st to 10th	Day	13% 13% 5% 10% 6% 6% 5% 4 5% 5% 29%	4296
	11th to 20th	Day	7% 9% 3 9% 5% 6% 6% 6% 7% 9% 32%	4503
	21st to end	Day	11% 12% 4 10% 6% 6% 6% 5% 8% 8% 24%	5161
June	1st to 10th	Day	13% 10% 3 8% 8% 6% 6% 5% 6% 6% 30%	2850
	11th to 20th	Day	10% 10% 3 9% 7% 7% 6% 6% 8% 8% 26%	2850
	21st to end	Day	5% 5% 2 6% 6% 5% 6% 5% 7% 8% 44%	2850
July	1st to 10th	Day	3 3 1 4 3 4 5% 4 6% 7% 60%	4740
	11th to 20th	Day	3 2 1 3 2 3 3 3 5% 7% 68%	4658
	21st to end	Day	1 2 1 4 3 3 4 4 6% 8% 63%	4790
August	1st to 10th	Day	3 3 1 3 3 4 5% 5% 7% 11% 54%	4401
	11th to 20th	Day	5% 3 1 3 3 4 4 4 7% 9% 57%	4115
	21st to end	Day	5% 3 2 6% 4 4 5% 4 6% 8% 53%	4491
September	1st to 10th	Day	6% 4 2 5% 4 4 4 4 6% 8% 54%	2280
	11th to 20th	Day	7% 6% 3 7% 4 5% 5% 4 5% 8% 47%	2122
	21st to end	Day	8% 6% 2 7% 4 5% 5% 4 6% 9% 44%	2090
October	1st to 10th	Day	6% 4 1 5% 4 4 5% 5% 7% 9% 49%	3447
	11th to 20th	Day	6% 6% 2 8% 5% 5% 6% 5% 7% 9% 42%	2842
	21st to end	Day	9% 11% 5% 9% 5% 5% 5% 3 5% 7% 36%	3101
November	1st to 10th	Day	9% 13% 5% 11% 7% 7% 7% 5% 7% 7% 22%	1764
	11th to 20th	Day	8% 10% 5% 11% 7% 7% 7% 5% 7% 7% 26%	1523
	21st to end	Day	4 12% 4 12% 7% 9% 8% 7% 8% 8% 21%	1400
December	1st to 10th	Day	7% 15% 4 13% 9% 7% 7% 6% 7% 7% 18%	1337
	11th to 20th	Day	8% 19% 7% 15% 10% 7% 6% 4 5% 5% 13%	1682
	21st to end	Day	6% 16% 6% 15% 11% 11% 8% 4 4 5% 13%	2442
January	1st to 10th	Night	6% 28% 12% 17% 7% 5% 5% 3 5% 4 8%	4726
	11th to 20th	Night	6% 15% 6% 12% 7% 6% 7% 5% 6% 7% 24%	4414
	21st to end	Night	9% 21% 7% 13% 7% 6% 6% 4 6% 7% 14%	4862
February	1st to 10th	Night	5% 15% 6% 13% 9% 7% 6% 5% 6% 8% 20%	2660
	11th to 20th	Night	3 14% 5% 11% 7% 7% 6% 5% 6% 8% 28%	2383
	21st to end	Night	4 14% 5% 10% 7% 6% 6% 6% 7% 7% 27%	1884
March	1st to 10th	Night	3 11% 6% 13% 6% 6% 6% 5% 6% 7% 31%	3736
	11th to 20th	Night	4 12% 4 9% 6% 4 5% 6% 5% 8% 38%	3616
	21st to end	Night	8% 17% 5% 10% 6% 5% 5% 5% 7% 8% 25%	3653
April	1st to 10th	Night	6% 10% 3 7% 4 5% 5% 6% 7% 9% 36%	1900
	11th to 20th	Night	5% 11% 4 10% 5% 5% 6% 5% 6% 8% 35%	1716
	21st to end	Night	6% 11% 3 7% 7% 5% 5% 5% 6% 7% 37%	1710
May	1st to 10th	Night	10% 14% 4 9% 5% 6% 5% 4 5% 6% 31%	2651
	11th to 20th	Night	5% 7% 2 8% 5% 5% 5% 4 7% 10% 40%	2374
	21st to end	Night	11% 12% 4 10% 5% 4 4 4 6% 9% 31%	2414
June	1st to 10th	Night	10% 7% 4 8% 5% 6% 4 5% 7% 8% 37%	1330
	11th to 20th	Night	11% 7% 2 8% 6% 6% 6% 5% 8% 7% 33%	1330
	21st to end	Night	3 5% 2 7% 4 4 4 4 8% 9% 49%	1330
July	1st to 10th	Night	2 2 1 4 3 3 5% 5% 7% 8% 59%	2220
	11th to 20th	Night	2 2 1 3 3 3 3 3 5% 7% 69%	2300
	21st to end	Night	2 1 1 2 2 2 3 2 5% 6% 74%	2762
August	1st to 10th	Night	3 4 1 4 2 3 4 4 6% 9% 61%	2529
	11th to 20th	Night	3 3 1 4 3 4 4 4 7% 10% 57%	2720
	21st to end	Night	4 3 1 4 3 3 4 4 7% 10% 58%	3173
September	1st to 10th	Night	4 4 2 3 3 3 3 3 6% 7% 62%	1900
	11th to 20th	Night	6% 6% 2 4 3 4 5% 4 5% 8% 53%	2057
	21st to end	Night	6% 6% 3 6% 3 3 5% 3 6% 8% 51%	2090
October	1st to 10th	Night	4 4 1 5% 4 5% 4 4 7% 9% 53%	3531
	11th to 20th	Night	7% 6% 2 7% 4 4 4 3 5% 8% 50%	4086
	21st to end	Night	7% 8% 3 9% 6% 5% 5% 5% 5% 7% 40%	4457
November	1st to 10th	Night	8% 13% 5% 10% 6% 6% 6% 5% 7% 8% 26%	2535
	11th to 20th	Night	7% 14% 5% 11% 7% 6% 5% 5% 8% 8% 24%	2854
	21st to end	Night	5% 17% 7% 13% 8% 7% 6% 5% 6% 7% 20%	3000
December	1st to 10th	Night	7% 17% 5% 14% 9% 5% 7% 4 6% 6% 19%	2878
	11th to 20th	Night	7% 20% 7% 19% 10% 7% 6% 4 5% 6% 10%	3510
	21st to end	Night	5% 17% 7% 17% 11% 8% 7% 4 5% 5% 13%	5214

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	68% 12% 12% 5% 2	2219
	11th to 20th	Day	54% 9% 18% 11% 3 5%	2539
	21st to end	Day	62% 18% 11% 6% 2	2794
February	1st to 10th	Day	55% 14% 17% 8% 6% 1	1520
	11th to 20th	Day	53% 14% 16% 11% 5%	1692
	21st to end	Day	52% 12% 17% 11% 6%	1570
March	1st to 10th	Day	48% 7% 20% 15% 9%	3138
	11th to 20th	Day	37% 13% 29% 17% 4	3363
	21st to end	Day	54% 14% 16% 11% 4	3997
April	1st to 10th	Day	52% 10% 19% 15% 4	2280
	11th to 20th	Day	50% 8% 18% 19% 5% 1	2414
	21st to end	Day	51% 10% 15% 18% 6% 1	2470
May	1st to 10th	Day	54% 8% 13% 18% 6% 1	4296
	11th to 20th	Day	42% 10% 17% 25% 6%	4507
	21st to end	Day	49% 12% 19% 14% 6%	5162
June	1st to 10th	Day	52% 8% 14% 17% 9% 1	2850
	11th to 20th	Day	51% 10% 15% 16% 6% 1	2850
	21st to end	Day	34% 10% 17% 24% 13% 2	2850
July	1st to 10th	Day	21% 7% 12% 26% 26% 7%	4666
	11th to 20th	Day	16% 5% 8% 20% 37% 13%	4577
	21st to end	Day	18% 5% 10% 26% 24% 17%	4639
August	1st to 10th	Day	22% 7% 20% 27% 18% 6%	4384
	11th to 20th	Day	21% 8% 23% 33% 14% 2	4156
	21st to end	Day	25% 7% 22% 32% 13% 1	4490
September	1st to 10th	Day	28% 7% 15% 31% 17% 3	2280
	11th to 20th	Day	34% 8% 17% 28% 12% 1	2122
	21st to end	Day	35% 10% 21% 24% 9% 1	2090
October	1st to 10th	Day	28% 9% 23% 35% 5%	3447
	11th to 20th	Day	33% 12% 22% 26% 6%	2842
	21st to end	Day	45% 10% 19% 19% 7%	3101
November	1st to 10th	Day	57% 12% 16% 12% 3	1764
	11th to 20th	Day	53% 13% 18% 11% 5%	1523
	21st to end	Day	53% 18% 20% 7% 2	1400
December	1st to 10th	Day	61% 11% 15% 12% 2	1337
	11th to 20th	Day	71% 11% 9% 7% 1	1684
	21st to end	Day	68% 9% 12% 6% 4 1	2442
January	1st to 10th	Night	72% 10% 10% 6% 2	4726
	11th to 20th	Night	56% 10% 11% 14% 5% 4	4452
	21st to end	Night	65% 12% 11% 9% 3	4862
February	1st to 10th	Night	57% 11% 15% 10% 6%	2660
	11th to 20th	Night	50% 11% 19% 13% 6%	2384
	21st to end	Night	48% 10% 19% 15% 7%	1884
March	1st to 10th	Night	41% 9% 26% 16% 7%	3736
	11th to 20th	Night	36% 11% 31% 17% 3 1	3616
	21st to end	Night	50% 12% 20% 14% 3	3653
April	1st to 10th	Night	39% 13% 25% 16% 8%	1900
	11th to 20th	Night	42% 9% 20% 22% 6%	1716
	21st to end	Night	43% 9% 16% 25% 6% 1	1710
May	1st to 10th	Night	50% 10% 13% 21% 6%	2651
	11th to 20th	Night	33% 10% 20% 28% 10%	2374
	21st to end	Night	45% 11% 19% 18% 7%	2414
June	1st to 10th	Night	42% 9% 18% 21% 8% 2	1330
	11th to 20th	Night	43% 10% 17% 20% 8% 1	1330
	21st to end	Night	28% 9% 18% 28% 15% 2	1330
July	1st to 10th	Night	18% 9% 18% 27% 19% 9%	2185
	11th to 20th	Night	15% 4 10% 22% 34% 16%	2258
	21st to end	Night	12% 4 9% 29% 28% 18%	2674
August	1st to 10th	Night	19% 6% 20% 31% 20% 5%	2521
	11th to 20th	Night	20% 7% 27% 27% 17% 2	2745
	21st to end	Night	18% 7% 25% 33% 16% 2	3173
September	1st to 10th	Night	21% 7% 14% 34% 19% 5%	1900
	11th to 20th	Night	28% 8% 18% 31% 13% 2	2057
	21st to end	Night	28% 9% 22% 26% 13% 1	2090
October	1st to 10th	Night	23% 8% 26% 34% 9%	3531
	11th to 20th	Night	29% 9% 23% 32% 7% 1	4086
	21st to end	Night	36% 12% 23% 25% 3	4457
November	1st to 10th	Night	50% 13% 18% 14% 4 1	2535
	11th to 20th	Night	51% 11% 18% 13% 6%	2854
	21st to end	Night	60% 11% 16% 10% 3	3000
December	1st to 10th	Night	63% 9% 13% 12% 3	2878
	11th to 20th	Night	72% 12% 9% 6% 1	3507
	21st to end	Night	66% 11% 12% 7% 4	5214

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	21% 2 12% 37% 19% 9%	180
	11th to 20th	Day	14% 2 17% 37% 21% 8%	180
	21st to end	Day	10% 2 22% 39% 18% 9%	198
February	1st to 10th	Day	13% 4 34% 36% 10% 3	180
	11th to 20th	Day	11% 6% 25% 35% 21% 3	310
	21st to end	Day	13% 8% 25% 31% 19% 4	382
March	1st to 10th	Day	13% 14% 32% 23% 13% 5%	460
	11th to 20th	Day	16% 10% 25% 22% 20% 6%	460
	21st to end	Day	19% 12% 25% 27% 12% 5%	506
April	1st to 10th	Day	21% 13% 25% 25% 13% 3	460
	11th to 20th	Day	19% 12% 26% 23% 15% 5%	452
	21st to end	Day	20% 13% 24% 23% 15% 6%	460
May	1st to 10th	Day	19% 9% 25% 27% 16% 4	463
	11th to 20th	Day	18% 10% 22% 28% 19% 4	562
	21st to end	Day	20% 7% 19% 29% 21% 4	734
June	1st to 10th	Day	22% 11% 25% 26% 14% 3	680
	11th to 20th	Day	18% 14% 24% 26% 16% 2	680
	21st to end	Day	10% 10% 25% 30% 21% 5%	680
July	1st to 10th	Day	8% 8% 22% 34% 24% 4	671
	11th to 20th	Day	7% 10% 26% 33% 22% 3	625
	21st to end	Day	6% 12% 29% 34% 16% 4	531
August	1st to 10th	Day	5% 7% 26% 37% 19% 5%	487
	11th to 20th	Day	6% 5% 27% 30% 24% 7%	477
	21st to end	Day	11% 9% 25% 30% 19% 6%	539
September	1st to 10th	Day	10% 10% 26% 30% 17% 7%	490
	11th to 20th	Day	13% 11% 21% 28% 18% 8%	490
	21st to end	Day	19% 12% 26% 24% 17% 2	490
October	1st to 10th	Day	15% 11% 25% 29% 16% 5%	481
	11th to 20th	Day	18% 8% 27% 22% 20% 6%	300
	21st to end	Day	25% 8% 24% 28% 12% 3	330
November	1st to 10th	Day	23% 8% 20% 35% 14% 1	300
	11th to 20th	Day	24% 10% 21% 34% 8% 3	253
	21st to end	Day	14% 7% 17% 38% 21% 6%	200
December	1st to 10th	Day	18% 2 15% 34% 21% 9%	182
	11th to 20th	Day	18% 5% 16% 39% 16% 7%	180
	21st to end	Day	16% 2 14% 40% 24% 4	198
January	1st to 10th	Night	19% 7% 23% 34% 14% 3	950
	11th to 20th	Night	15% 5% 20% 43% 14% 4	779
	21st to end	Night	15% 3 20% 43% 14% 5%	836
February	1st to 10th	Night	14% 6% 22% 42% 13% 3	760
	11th to 20th	Night	11% 5% 23% 41% 18% 2	744
	21st to end	Night	12% 4 21% 39% 19% 4	628
March	1st to 10th	Night	12% 6% 26% 37% 17% 2	760
	11th to 20th	Night	15% 6% 24% 34% 18% 3	760
	21st to end	Night	14% 5% 24% 38% 16% 3	836
April	1st to 10th	Night	13% 5% 25% 35% 22% 1	760
	11th to 20th	Night	11% 7% 28% 38% 16%	588
	21st to end	Night	13% 6% 27% 36% 17% 1	570
May	1st to 10th	Night	13% 6% 20% 37% 23% 2	452
	11th to 20th	Night	11% 3 15% 40% 28% 3	374
	21st to end	Night	20% 3 15% 33% 27% 2	411
June	1st to 10th	Night	17% 4 20% 35% 21% 3	380
	11th to 20th	Night	16% 5% 18% 39% 22% 1	380
	21st to end	Night	8% 4 19% 41% 25% 3	380
July	1st to 10th	Night	4 1 14% 45% 34% 2	370
	11th to 20th	Night	4 2 18% 52% 22% 2	368
	21st to end	Night	2 2 18% 44% 32% 1	416
August	1st to 10th	Night	5% 1 10% 46% 35% 3	378
	11th to 20th	Night	6% 3 11% 40% 37% 3	509
	21st to end	Night	7% 4 16% 45% 26% 2	641
September	1st to 10th	Night	6% 2 19% 43% 25% 5%	760
	11th to 20th	Night	10% 3 15% 35% 33% 4	760
	21st to end	Night	12% 5% 19% 39% 21% 4	760
October	1st to 10th	Night	13% 3 21% 40% 21% 1	760
	11th to 20th	Night	15% 2 22% 39% 20% 3	760
	21st to end	Night	18% 5% 23% 38% 14% 2	836
November	1st to 10th	Night	17% 7% 22% 40% 12% 2	780
	11th to 20th	Night	18% 10% 25% 32% 14% 2	964
	21st to end	Night	14% 9% 22% 36% 17% 2	1000
December	1st to 10th	Night	16% 3 21% 39% 17% 3	960
	11th to 20th	Night	16% 4 20% 43% 15% 1	950
	21st to end	Night	16% 5% 18% 43% 16% 2	1045

Page generated at 2024-11-29 07:43:06. Version ac07

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