Stub Stewart State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stub Stewart State Park clear sky chart from 2005-11-06 to 2024-10-24.

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	18% 10% 3 7% 5% 4 4 3 5% 6% 35%	101955
	Night	18% 11% 3 7% 4 4 4 3 4 5% 36%	96936
Transparency	Day	51% 3 12% 18% 12% 4	101695
	Night	51% 3 13% 19% 11% 4	96785
Seeing	Day	22% 11% 26% 25% 13% 3	15011
	Night	22% 6% 22% 33% 15% 2	23480

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	31% 19% 5% 10% 6% 5% 5% 4 4 3 8%	2539
	11th to 20th	Day	33% 15% 4 9% 5% 3 3 2 3 3 20%	2540
	21st to end	Day	31% 16% 4 10% 6% 5% 4 3 4 3 13%	3064
February	1st to 10th	Day	26% 17% 4 9% 6% 5% 4 3 4 6% 16%	1710
	11th to 20th	Day	27% 19% 6% 9% 5% 4 4 3 4 3 17%	1665
	21st to end	Day	25% 19% 5% 9% 6% 5% 4 3 4 3 16%	1465
March	1st to 10th	Day	18% 20% 5% 12% 7% 6% 5% 3 4 5% 16%	3319
	11th to 20th	Day	21% 14% 3 7% 4 4 3 2 3 3 35%	3490
	21st to end	Day	23% 18% 5% 10% 6% 5% 5% 3 4 4 15%	3881
April	1st to 10th	Day	26% 16% 5% 9% 5% 5% 4 3 5% 5% 17%	2280
	11th to 20th	Day	24% 16% 4 8% 5% 4 4 3 4 4 23%	2275
	21st to end	Day	23% 13% 4 7% 6% 5% 5% 5% 6% 5% 22%	2470
May	1st to 10th	Day	20% 11% 3 7% 5% 4 4 3 5% 6% 33%	4327
	11th to 20th	Day	11% 6% 2 6% 5% 4 5% 4 6% 8% 42%	4377
	21st to end	Day	20% 10% 3 8% 7% 6% 7% 5% 6% 6% 23%	4813
June	1st to 10th	Day	21% 10% 3 7% 6% 5% 4 3 5% 6% 31%	2660
	11th to 20th	Day	18% 9% 3 8% 5% 5% 6% 5% 7% 8% 25%	2751
	21st to end	Day	10% 7% 2 5% 4 4 4 3 6% 8% 47%	2850
July	1st to 10th	Day	5% 4 1 4 3 3 3 2 4 5% 68%	4649
	11th to 20th	Day	5% 2 1 2 2 2 2 2 3 5% 72%	4420
	21st to end	Day	7% 4 1 3 2 2 3 2 4 6% 65%	4790
August	1st to 10th	Day	4 3 1 3 3 2 2 3 4 6% 67%	4102
	11th to 20th	Day	6% 5% 2 6% 5% 6% 6% 4 6% 8% 46%	4026
	21st to end	Day	9% 7% 3 6% 4 4 4 4 5% 6% 49%	4340
September	1st to 10th	Day	7% 4 2 4 3 4 3 3 5% 7% 57%	2280
	11th to 20th	Day	13% 7% 2 7% 5% 4 5% 4 6% 7% 41%	2258
	21st to end	Day	16% 7% 2 6% 4 4 4 3 4 6% 44%	2010
October	1st to 10th	Day	20% 8% 2 6% 4 5% 4 2 5% 7% 39%	1900
	11th to 20th	Day	19% 8% 3 9% 5% 4 4 4 5% 7% 32%	1900
	21st to end	Day	27% 10% 4 7% 4 4 3 3 3 5% 30%	1982
November	1st to 10th	Day	28% 14% 4 9% 5% 6% 5% 4 5% 5% 17%	1540
	11th to 20th	Day	31% 12% 5% 9% 4 4 4 3 3 5% 20%	1520
	21st to end	Day	25% 13% 5% 9% 6% 5% 3 3 5% 4 23%	1520
December	1st to 10th	Day	23% 17% 3 8% 5% 5% 5% 4 3 4 23%	1520
	11th to 20th	Day	27% 15% 5% 8% 6% 6% 4 4 4 5% 16%	1928
	21st to end	Day	27% 17% 5% 12% 7% 5% 4 4 4 4 11%	2794
January	1st to 10th	Night	30% 14% 4 10% 7% 6% 6% 4 4 4 12%	4406
	11th to 20th	Night	29% 17% 5% 10% 5% 4 3 3 4 4 17%	4420
	21st to end	Night	36% 16% 4 8% 4 4 3 3 4 4 14%	4583
February	1st to 10th	Night	23% 18% 4 8% 7% 5% 5% 3 4 5% 19%	2470
	11th to 20th	Night	23% 15% 4 8% 5% 4 5% 4 4 5% 24%	2402
	21st to end	Night	21% 17% 4 9% 6% 4 5% 4 4 5% 21%	1989
March	1st to 10th	Night	15% 19% 4 9% 6% 7% 5% 3 4 5% 21%	3550
	11th to 20th	Night	16% 13% 2 7% 4 4 3 3 4 5% 40%	3490
	21st to end	Night	23% 18% 4 9% 6% 5% 5% 3 5% 5% 17%	3772
April	1st to 10th	Night	22% 14% 4 8% 5% 6% 5% 3 4 5% 23%	1900
	11th to 20th	Night	18% 14% 3 8% 6% 4 4 4 5% 6% 29%	1850
	21st to end	Night	18% 12% 2 7% 5% 5% 4 4 5% 7% 32%	1710
May	1st to 10th	Night	19% 8% 2 5% 4 4 3 3 5% 5% 42%	2620
	11th to 20th	Night	8% 5% 2 5% 3 4 4 4 5% 8% 53%	2516
	21st to end	Night	10% 9% 3 7% 6% 6% 6% 4 6% 7% 36%	2762
June	1st to 10th	Night	16% 7% 3 6% 6% 4 3 3 5% 6% 40%	1520
	11th to 20th	Night	13% 8% 2 6% 5% 4 4 4 6% 8% 41%	1421
	21st to end	Night	7% 5% 1 5% 3 3 4 2 5% 5% 60%	1330
July	1st to 10th	Night	2 2 1 2 2 2 3 2 3 5% 76%	2306
	11th to 20th	Night	3 3 1 2 2 2 2 2 3 4 76%	2540
	21st to end	Night	3 1 1 2 2 3 3 2 3 5% 76%	2761
August	1st to 10th	Night	2 2 1 2 1 2 2 2 4 5% 78%	2834
	11th to 20th	Night	6% 4 2 4 2 3 4 4 5% 7% 61%	2812
	21st to end	Night	9% 5% 1 5% 3 2 3 2 4 5% 60%	3331
September	1st to 10th	Night	5% 4 1 3 3 3 3 2 4 6% 66%	1900
	11th to 20th	Night	9% 5% 3 5% 4 4 5% 3 5% 6% 51%	1919
	21st to end	Night	10% 6% 2 5% 4 4 4 3 5% 7% 52%	2169
October	1st to 10th	Night	15% 6% 2 4 4 3 4 3 4 7% 47%	2280
	11th to 20th	Night	17% 8% 2 6% 4 4 4 3 5% 7% 39%	2280
	21st to end	Night	24% 7% 2 6% 3 4 4 3 4 5% 37%	2439
November	1st to 10th	Night	27% 11% 4 9% 5% 5% 4 3 4 6% 23%	2536
	11th to 20th	Night	30% 11% 3 7% 5% 5% 5% 4 4 5% 21%	2660
	21st to end	Night	23% 12% 4 8% 5% 4 4 3 4 5% 28%	2660
December	1st to 10th	Night	23% 14% 5% 8% 5% 4 5% 3 5% 5% 24%	2660
	11th to 20th	Night	26% 16% 4 9% 5% 5% 4 3 4 6% 18%	3276
	21st to end	Night	27% 17% 4 9% 6% 5% 5% 3 4 4 17%	4862

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	83% 1 7% 7% 2	2539
	11th to 20th	Day	72% 1 8% 12% 4 2	2540
	21st to end	Day	77% 2 7% 8% 5%	3064
February	1st to 10th	Day	72% 2 11% 12% 4	1710
	11th to 20th	Day	72% 3 8% 11% 5% 1	1674
	21st to end	Day	74% 2 9% 8% 6% 1	1465
March	1st to 10th	Day	72% 1 11% 11% 5%	3319
	11th to 20th	Day	57% 1 7% 27% 8%	3490
	21st to end	Day	74% 2 11% 11% 3	3881
April	1st to 10th	Day	70% 2 12% 13% 2	2280
	11th to 20th	Day	66% 2 9% 14% 8% 2	2278
	21st to end	Day	63% 3 12% 14% 6% 1	2470
May	1st to 10th	Day	54% 1 10% 23% 12%	4327
	11th to 20th	Day	39% 2 20% 27% 11% 1	4380
	21st to end	Day	61% 3 19% 14% 3	4814
June	1st to 10th	Day	56% 2 16% 17% 9%	2660
	11th to 20th	Day	56% 4 17% 16% 6%	2751
	21st to end	Day	36% 3 19% 28% 10% 3	2850
July	1st to 10th	Day	20% 2 9% 17% 21% 30%	4577
	11th to 20th	Day	16% 2 6% 22% 37% 16%	4345
	21st to end	Day	18% 4 12% 29% 32% 5%	4639
August	1st to 10th	Day	19% 2 10% 27% 29% 13%	4086
	11th to 20th	Day	31% 10% 17% 25% 13% 4	4065
	21st to end	Day	34% 6% 11% 24% 20% 5%	4339
September	1st to 10th	Day	26% 2 14% 28% 20% 10%	2280
	11th to 20th	Day	41% 5% 13% 21% 15% 6%	2258
	21st to end	Day	42% 3 14% 21% 16% 4	2010
October	1st to 10th	Day	47% 3 9% 24% 15% 3	1900
	11th to 20th	Day	52% 5% 12% 18% 13% 1	1900
	21st to end	Day	59% 3 7% 17% 14% 1	1982
November	1st to 10th	Day	70% 2 10% 13% 4	1540
	11th to 20th	Day	69% 2 10% 11% 6% 2	1520
	21st to end	Day	66% 3 7% 12% 12% 1	1520
December	1st to 10th	Day	66% 3 7% 13% 10% 1	1520
	11th to 20th	Day	71% 2 11% 13% 3	1928
	21st to end	Day	78% 1 10% 8% 3	2794
January	1st to 10th	Night	76% 2 9% 9% 4 1	4406
	11th to 20th	Night	72% 2 8% 13% 4 2	4420
	21st to end	Night	76% 1 8% 8% 6% 1	4583
February	1st to 10th	Night	68% 3 10% 14% 5% 1	2470
	11th to 20th	Night	63% 3 12% 14% 6% 2	2404
	21st to end	Night	66% 3 11% 12% 7% 1	1989
March	1st to 10th	Night	67% 2 11% 17% 4	3550
	11th to 20th	Night	48% 2 14% 26% 9% 1	3490
	21st to end	Night	71% 2 13% 13% 2	3772
April	1st to 10th	Night	64% 3 13% 15% 5%	1900
	11th to 20th	Night	55% 4 13% 17% 8% 3	1850
	21st to end	Night	53% 3 16% 19% 7% 2	1710
May	1st to 10th	Night	45% 1 12% 30% 11% 1	2620
	11th to 20th	Night	29% 2 17% 34% 15% 2	2516
	21st to end	Night	46% 5% 29% 16% 4	2762
June	1st to 10th	Night	46% 3 17% 24% 8% 1	1520
	11th to 20th	Night	41% 3 21% 27% 8%	1421
	21st to end	Night	26% 2 22% 34% 11% 5%	1330
July	1st to 10th	Night	12% 2 12% 20% 22% 32%	2269
	11th to 20th	Night	15% 1 8% 22% 32% 23%	2492
	21st to end	Night	11% 3 13% 32% 32% 9%	2674
August	1st to 10th	Night	11% 1 12% 29% 31% 16%	2826
	11th to 20th	Night	20% 6% 26% 31% 12% 5%	2839
	21st to end	Night	26% 4 17% 25% 23% 4	3331
September	1st to 10th	Night	21% 3 15% 29% 22% 11%	1900
	11th to 20th	Night	34% 4 15% 24% 15% 8%	1919
	21st to end	Night	33% 3 17% 22% 18% 7%	2169
October	1st to 10th	Night	37% 3 10% 29% 17% 4	2280
	11th to 20th	Night	46% 3 12% 22% 15% 3	2280
	21st to end	Night	50% 3 10% 19% 15% 2	2439
November	1st to 10th	Night	63% 3 10% 16% 7%	2536
	11th to 20th	Night	66% 3 11% 12% 7% 1	2660
	21st to end	Night	60% 2 10% 13% 13% 2	2660
December	1st to 10th	Night	62% 4 9% 14% 10% 1	2660
	11th to 20th	Night	69% 3 10% 11% 7%	3276
	21st to end	Night	72% 2 11% 11% 3	4862

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	42% 12% 21% 13% 9% 3	180
	11th to 20th	Day	39% 7% 23% 14% 12% 4	180
	21st to end	Day	35% 8% 18% 23% 13% 2	364
February	1st to 10th	Day	35% 9% 27% 17% 9% 2	370
	11th to 20th	Day	37% 14% 27% 15% 7% 1	365
	21st to end	Day	36% 16% 22% 19% 5% 1	332
March	1st to 10th	Day	33% 15% 27% 19% 6%	460
	11th to 20th	Day	32% 13% 24% 20% 9% 2	460
	21st to end	Day	33% 14% 24% 18% 9% 1	506
April	1st to 10th	Day	33% 13% 21% 21% 9% 3	460
	11th to 20th	Day	29% 16% 29% 15% 7% 4	452
	21st to end	Day	28% 12% 30% 19% 10% 2	460
May	1st to 10th	Day	18% 17% 28% 21% 12% 4	463
	11th to 20th	Day	24% 10% 27% 22% 12% 4	488
	21st to end	Day	20% 10% 26% 28% 13% 4	529
June	1st to 10th	Day	22% 10% 26% 27% 13% 1	490
	11th to 20th	Day	18% 17% 35% 23% 6% 1	581
	21st to end	Day	8% 12% 33% 30% 14% 3	680
July	1st to 10th	Day	10% 7% 30% 35% 13% 5%	621
	11th to 20th	Day	7% 10% 27% 35% 17% 3	484
	21st to end	Day	4 6% 25% 41% 20% 4	531
August	1st to 10th	Day	7% 6% 24% 37% 21% 6%	487
	11th to 20th	Day	5% 4 23% 35% 25% 7%	477
	21st to end	Day	8% 7% 31% 31% 17% 5%	539
September	1st to 10th	Day	8% 8% 27% 36% 19% 3	490
	11th to 20th	Day	14% 8% 24% 31% 18% 6%	490
	21st to end	Day	18% 12% 24% 29% 14% 3	490
October	1st to 10th	Day	22% 9% 21% 27% 18% 3	490
	11th to 20th	Day	22% 9% 24% 24% 18% 4	490
	21st to end	Day	31% 12% 24% 18% 11% 4	479
November	1st to 10th	Day	31% 12% 26% 20% 10% 1	205
	11th to 20th	Day	31% 11% 24% 19% 9% 7%	180
	21st to end	Day	24% 12% 24% 22% 14% 3	180
December	1st to 10th	Day	32% 8% 23% 21% 11% 4	180
	11th to 20th	Day	38% 7% 24% 20% 10% 1	180
	21st to end	Day	35% 11% 20% 21% 11% 2	198
January	1st to 10th	Night	36% 6% 19% 23% 13% 2	760
	11th to 20th	Night	35% 6% 16% 25% 17% 1	760
	21st to end	Night	31% 5% 14% 31% 17% 3	836
February	1st to 10th	Night	28% 8% 21% 28% 14% 1	760
	11th to 20th	Night	30% 8% 18% 28% 15% 1	744
	21st to end	Night	29% 7% 20% 32% 12%	628
March	1st to 10th	Night	26% 8% 22% 30% 13% 1	760
	11th to 20th	Night	28% 6% 18% 34% 13% 1	760
	21st to end	Night	29% 10% 21% 28% 11% 1	836
April	1st to 10th	Night	27% 9% 22% 28% 13% 1	760
	11th to 20th	Night	24% 7% 25% 32% 11% 1	722
	21st to end	Night	22% 6% 26% 32% 13% 1	570
May	1st to 10th	Night	15% 8% 31% 31% 13% 1	434
	11th to 20th	Night	13% 7% 27% 35% 17% 1	374
	21st to end	Night	15% 7% 28% 34% 16%	411
June	1st to 10th	Night	18% 4 29% 37% 11%	380
	11th to 20th	Night	13% 7% 33% 35% 11% 1	380
	21st to end	Night	8% 6% 33% 42% 11% 1	380
July	1st to 10th	Night	5% 4 32% 45% 13%	370
	11th to 20th	Night	4 6% 39% 39% 11%	368
	21st to end	Night	3 3 35% 44% 13%	416
August	1st to 10th	Night	4 3 27% 42% 22% 2	553
	11th to 20th	Night	6% 2 17% 48% 25% 2	564
	21st to end	Night	7% 4 28% 39% 20% 1	734
September	1st to 10th	Night	6% 5% 26% 45% 17% 1	760
	11th to 20th	Night	9% 4 20% 37% 26% 4	760
	21st to end	Night	12% 6% 21% 40% 19% 2	760
October	1st to 10th	Night	16% 4 23% 37% 18% 2	760
	11th to 20th	Night	19% 4 19% 32% 22% 4	760
	21st to end	Night	26% 5% 21% 27% 19% 2	804
November	1st to 10th	Night	30% 5% 16% 35% 13% 1	740
	11th to 20th	Night	34% 7% 17% 28% 13% 1	760
	21st to end	Night	27% 5% 19% 31% 17% 2	760
December	1st to 10th	Night	27% 5% 17% 33% 15% 2	760
	11th to 20th	Night	35% 7% 16% 28% 13% 1	760
	21st to end	Night	39% 7% 20% 24% 9% 1	836

Page generated at 2024-10-20 23:20:01. Version ac07

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