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 2024-02-20.

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	20% 11% 4 6% 6% 3 4 4 5% 6% 31%	78726
	Night	20% 11% 3 6% 5% 3 4 4 4 6% 32%	80457
Transparency	Day	55% 3 12% 18% 10% 2	78426
	Night	54% 3 12% 18% 10% 3	80278
Seeing	Day	22% 10% 26% 26% 13% 3	14008
	Night	23% 6% 21% 33% 16% 2	22713

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% 9% 7% 4 5% 5% 4 3 8%	2539
	11th to 20th	Day	33% 14% 5% 8% 6% 2 3 3 3 3 20%	2540
	21st to end	Day	31% 15% 5% 9% 7% 4 5% 4 4 3 13%	3064
February	1st to 10th	Day	27% 16% 5% 8% 6% 4 4 4 4 6% 16%	1710
	11th to 20th	Day	27% 17% 6% 7% 6% 3 4 4 4 3 18%	1657
	21st to end	Day	25% 17% 7% 8% 7% 4 5% 3 4 4 16%	1381
March	1st to 10th	Day	26% 16% 5% 9% 7% 4 5% 4 4 5% 16%	1903
	11th to 20th	Day	30% 15% 4 8% 6% 3 4 3 3 5% 19%	1980
	21st to end	Day	29% 15% 5% 10% 7% 4 5% 5% 5% 4 11%	2209
April	1st to 10th	Day	27% 14% 6% 8% 6% 4 4 4 5% 5% 16%	2160
	11th to 20th	Day	26% 15% 5% 7% 6% 3 4 4 3 5% 21%	2153
	21st to end	Day	23% 13% 4 6% 6% 4 5% 6% 6% 6% 22%	2340
May	1st to 10th	Day	16% 10% 3 6% 6% 4 5% 4 5% 7% 33%	2466
	11th to 20th	Day	19% 10% 4 7% 6% 3 5% 5% 6% 7% 28%	2477
	21st to end	Day	22% 8% 4 6% 6% 3 6% 6% 7% 7% 25%	2723
June	1st to 10th	Day	21% 9% 5% 6% 7% 3 4 4 4 6% 30%	2520
	11th to 20th	Day	19% 8% 4 7% 6% 4 6% 5% 7% 8% 25%	2606
	21st to end	Day	11% 6% 3 5% 4 3 4 4 5% 8% 47%	2700
July	1st to 10th	Day	8% 6% 2 5% 5% 2 4 4 4 6% 54%	2651
	11th to 20th	Day	9% 3 2 3 3 2 3 4 5% 7% 58%	2520
	21st to end	Day	5% 3 1 2 2 2 2 3 4 6% 70%	2741
August	1st to 10th	Day	6% 4 2 3 3 2 3 4 5% 7% 60%	2339
	11th to 20th	Day	7% 4 1 3 3 2 3 4 4 7% 62%	2298
	21st to end	Day	8% 6% 2 4 5% 3 5% 5% 5% 7% 51%	2471
September	1st to 10th	Day	7% 4 2 4 4 3 3 4 5% 7% 58%	2160
	11th to 20th	Day	12% 6% 3 6% 6% 3 5% 5% 6% 7% 42%	2140
	21st to end	Day	17% 7% 2 5% 5% 3 4 4 4 6% 44%	1905
October	1st to 10th	Day	21% 7% 2 5% 5% 4 4 3 5% 7% 37%	1800
	11th to 20th	Day	20% 8% 3 8% 6% 2 4 4 5% 7% 33%	1800
	21st to end	Day	27% 10% 4 6% 5% 3 3 3 3 5% 30%	1951
November	1st to 10th	Day	28% 14% 4 8% 6% 4 6% 5% 5% 5% 17%	1540
	11th to 20th	Day	31% 11% 5% 8% 5% 4 4 4 3 5% 20%	1520
	21st to end	Day	25% 12% 5% 8% 7% 3 4 4 5% 4 23%	1520
December	1st to 10th	Day	24% 15% 4 7% 6% 3 6% 5% 3 4 23%	1520
	11th to 20th	Day	28% 15% 4 8% 7% 4 5% 4 4 5% 16%	1928
	21st to end	Day	27% 17% 5% 10% 8% 4 5% 4 4 4 11%	2794
January	1st to 10th	Night	30% 14% 4 8% 8% 5% 5% 5% 4 4 12%	4406
	11th to 20th	Night	29% 16% 5% 9% 5% 3 3 4 4 4 17%	4420
	21st to end	Night	36% 16% 4 7% 5% 3 4 4 4 4 14%	4583
February	1st to 10th	Night	23% 17% 4 8% 7% 4 5% 5% 4 5% 19%	2470
	11th to 20th	Night	24% 14% 4 7% 6% 3 5% 5% 4 5% 25%	2394
	21st to end	Night	21% 15% 5% 8% 7% 3 5% 5% 4 5% 21%	1875
March	1st to 10th	Night	23% 15% 5% 8% 7% 4 4 3 3 5% 23%	2052
	11th to 20th	Night	24% 11% 3 9% 7% 4 4 4 5% 7% 23%	1980
	21st to end	Night	25% 12% 5% 8% 8% 4 6% 4 5% 6% 18%	2147
April	1st to 10th	Night	23% 14% 5% 7% 6% 4 6% 4 4 5% 23%	1800
	11th to 20th	Night	19% 13% 3 7% 7% 3 4 5% 5% 7% 27%	1752
	21st to end	Night	19% 12% 2 6% 5% 4 4 4 5% 7% 33%	1620
May	1st to 10th	Night	11% 8% 3 7% 7% 3 4 5% 6% 7% 40%	1492
	11th to 20th	Night	14% 7% 3 6% 5% 4 5% 6% 5% 9% 36%	1416
	21st to end	Night	13% 7% 3 6% 7% 4 6% 5% 6% 8% 36%	1552
June	1st to 10th	Night	16% 7% 4 6% 6% 3 4 4 4 7% 40%	1440
	11th to 20th	Night	14% 7% 3 6% 6% 3 4 4 5% 8% 40%	1347
	21st to end	Night	7% 5% 1 4 3 2 3 4 4 5% 61%	1260
July	1st to 10th	Night	4 3 1 3 3 2 3 4 5% 7% 65%	1304
	11th to 20th	Night	4 3 1 2 3 2 3 3 5% 6% 67%	1440
	21st to end	Night	3 1 2 2 1 2 2 2 6% 80%	1576
August	1st to 10th	Night	3 2 1 2 2 2 3 2 5% 6% 72%	1597
	11th to 20th	Night	4 2 1 2 2 2 2 3 3 6% 72%	1602
	21st to end	Night	6% 3 1 3 4 2 4 4 5% 7% 62%	1883
September	1st to 10th	Night	5% 4 1 3 3 2 3 2 4 6% 66%	1800
	11th to 20th	Night	9% 5% 2 4 5% 3 5% 4 5% 6% 51%	1818
	21st to end	Night	10% 6% 2 4 5% 2 4 4 5% 7% 51%	2054
October	1st to 10th	Night	16% 6% 2 3 4 3 4 4 4 6% 47%	2160
	11th to 20th	Night	17% 8% 2 5% 5% 3 4 4 5% 7% 40%	2160
	21st to end	Night	24% 7% 2 5% 4 3 5% 4 4 5% 37%	2403
November	1st to 10th	Night	28% 11% 4 7% 6% 3 4 4 4 6% 24%	2536
	11th to 20th	Night	30% 11% 3 6% 6% 4 5% 5% 4 5% 21%	2660
	21st to end	Night	23% 11% 4 7% 6% 4 4 5% 4 5% 28%	2660
December	1st to 10th	Night	23% 12% 5% 7% 5% 3 5% 4 5% 6% 24%	2660
	11th to 20th	Night	27% 15% 4 8% 6% 4 5% 4 4 6% 18%	3276
	21st to end	Night	27% 16% 5% 8% 7% 3 5% 4 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	1666
	21st to end	Day	73% 2 9% 8% 6% 1	1381
March	1st to 10th	Day	71% 2 10% 11% 6%	1903
	11th to 20th	Day	71% 2 8% 15% 4 1	1980
	21st to end	Day	78% 3 10% 9%	2209
April	1st to 10th	Day	71% 2 11% 13% 3	2160
	11th to 20th	Day	67% 2 8% 13% 7% 2	2156
	21st to end	Day	63% 3 13% 14% 6% 1	2340
May	1st to 10th	Day	52% 2 15% 22% 8% 1	2466
	11th to 20th	Day	55% 3 14% 19% 8% 1	2480
	21st to end	Day	57% 4 18% 18% 4	2724
June	1st to 10th	Day	57% 2 17% 16% 8%	2520
	11th to 20th	Day	57% 3 18% 16% 5%	2606
	21st to end	Day	36% 3 19% 28% 10% 4	2700
July	1st to 10th	Day	33% 2 13% 25% 21% 5%	2579
	11th to 20th	Day	26% 2 10% 31% 23% 7%	2445
	21st to end	Day	16% 1 11% 34% 31% 7%	2589
August	1st to 10th	Day	24% 3 15% 34% 20% 5%	2322
	11th to 20th	Day	24% 3 14% 31% 21% 7%	2298
	21st to end	Day	33% 3 11% 31% 19% 3	2471
September	1st to 10th	Day	26% 2 13% 29% 20% 10%	2160
	11th to 20th	Day	40% 4 13% 20% 16% 6%	2140
	21st to end	Day	43% 3 13% 20% 17% 5%	1905
October	1st to 10th	Day	48% 2 9% 23% 15% 3	1800
	11th to 20th	Day	52% 4 12% 18% 12% 1	1800
	21st to end	Day	60% 3 7% 16% 14% 1	1951
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% 15% 6% 2	2396
	21st to end	Night	66% 3 11% 12% 7% 1	1875
March	1st to 10th	Night	65% 3 11% 15% 6%	2052
	11th to 20th	Night	62% 4 12% 15% 6% 1	1980
	21st to end	Night	68% 3 15% 13% 2	2147
April	1st to 10th	Night	65% 3 12% 15% 5%	1800
	11th to 20th	Night	57% 4 12% 17% 8% 3	1752
	21st to end	Night	52% 3 17% 19% 7% 2	1620
May	1st to 10th	Night	43% 2 17% 26% 10% 1	1492
	11th to 20th	Night	44% 3 20% 24% 7% 2	1416
	21st to end	Night	46% 5% 21% 20% 7%	1552
June	1st to 10th	Night	46% 3 17% 25% 8% 1	1440
	11th to 20th	Night	43% 3 21% 26% 7%	1347
	21st to end	Night	26% 2 22% 33% 11% 5%	1260
July	1st to 10th	Night	21% 3 18% 28% 20% 10%	1267
	11th to 20th	Night	19% 2 13% 30% 28% 8%	1392
	21st to end	Night	10% 2 12% 35% 29% 13%	1488
August	1st to 10th	Night	15% 2 20% 32% 25% 6%	1589
	11th to 20th	Night	16% 2 16% 35% 21% 10%	1602
	21st to end	Night	24% 2 13% 35% 22% 4	1883
September	1st to 10th	Night	21% 3 14% 30% 22% 11%	1800
	11th to 20th	Night	34% 3 15% 23% 16% 9%	1818
	21st to end	Night	34% 2 16% 22% 19% 8%	2054
October	1st to 10th	Night	39% 2 10% 29% 17% 4	2160
	11th to 20th	Night	45% 3 11% 22% 16% 3	2160
	21st to end	Night	50% 3 10% 19% 15% 2	2403
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	36% 14% 27% 15% 7% 1	363
	21st to end	Day	35% 18% 23% 19% 6% 1	302
March	1st to 10th	Day	33% 15% 28% 18% 6%	420
	11th to 20th	Day	34% 14% 24% 19% 9% 1	420
	21st to end	Day	33% 14% 23% 19% 10% 1	462
April	1st to 10th	Day	34% 14% 21% 20% 9% 3	420
	11th to 20th	Day	32% 14% 26% 16% 7% 5%	412
	21st to end	Day	29% 11% 30% 19% 10% 2	420
May	1st to 10th	Day	17% 17% 27% 23% 12% 4	423
	11th to 20th	Day	26% 10% 25% 22% 12% 4	448
	21st to end	Day	20% 10% 26% 28% 13% 4	485
June	1st to 10th	Day	22% 10% 26% 27% 14% 1	450
	11th to 20th	Day	19% 16% 35% 24% 6% 1	536
	21st to end	Day	8% 12% 32% 31% 14% 3	630
July	1st to 10th	Day	10% 6% 30% 36% 14% 5%	574
	11th to 20th	Day	8% 10% 27% 34% 17% 3	444
	21st to end	Day	3 5% 24% 43% 20% 5%	487
August	1st to 10th	Day	7% 6% 23% 37% 21% 6%	447
	11th to 20th	Day	6% 4 23% 36% 25% 7%	437
	21st to end	Day	8% 7% 31% 32% 17% 5%	495
September	1st to 10th	Day	8% 8% 28% 36% 17% 2	450
	11th to 20th	Day	14% 7% 21% 33% 19% 6%	450
	21st to end	Day	19% 12% 22% 29% 14% 4	450
October	1st to 10th	Day	23% 8% 21% 27% 18% 3	450
	11th to 20th	Day	22% 7% 25% 23% 18% 5%	450
	21st to end	Day	31% 11% 24% 18% 12% 5%	466
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% 7% 18% 28% 15% 1	742
	21st to end	Night	29% 8% 20% 32% 12%	592
March	1st to 10th	Night	26% 8% 22% 29% 13% 1	720
	11th to 20th	Night	28% 6% 18% 34% 13% 1	720
	21st to end	Night	29% 9% 21% 29% 11% 2	792
April	1st to 10th	Night	27% 9% 22% 27% 13% 1	720
	11th to 20th	Night	25% 7% 23% 33% 11% 1	684
	21st to end	Night	22% 6% 25% 32% 14% 1	540
May	1st to 10th	Night	14% 8% 30% 32% 14% 1	412
	11th to 20th	Night	14% 5% 26% 36% 18% 1	354
	21st to end	Night	15% 7% 27% 33% 17%	389
June	1st to 10th	Night	18% 3 28% 38% 12%	360
	11th to 20th	Night	14% 6% 32% 36% 12% 1	360
	21st to end	Night	8% 5% 32% 43% 11% 1	360
July	1st to 10th	Night	5% 3 31% 47% 14%	350
	11th to 20th	Night	5% 6% 39% 39% 11%	348
	21st to end	Night	3 3 35% 46% 13% 1	394
August	1st to 10th	Night	4 2 25% 43% 23% 2	523
	11th to 20th	Night	5% 2 16% 49% 26% 2	534
	21st to end	Night	7% 4 28% 39% 20% 1	695
September	1st to 10th	Night	6% 5% 26% 44% 17% 2	720
	11th to 20th	Night	9% 4 18% 37% 27% 5%	720
	21st to end	Night	13% 5% 19% 41% 20% 2	720
October	1st to 10th	Night	17% 4 23% 36% 18% 2	720
	11th to 20th	Night	19% 3 19% 32% 22% 4	720
	21st to end	Night	26% 5% 21% 27% 19% 2	792
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 2024-02-17 03:28:39. Version ac07

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