Salt Fork State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salt Fork State Park clear sky chart from 2005-11-06 to 2024-07-16.

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	16% 11% 4 8% 5% 5% 4 4 5% 7% 31%	89418
	Night	17% 12% 4 8% 4 4 4 3 5% 6% 33%	89991
Transparency	Day	51% 6% 10% 20% 11% 1	89190
	Night	51% 5% 10% 21% 11% 2	89823
Seeing	Day	24% 12% 27% 21% 12% 5%	14308
	Night	22% 10% 26% 27% 13% 2	24467

By Month

Percentage Cloud Cover SE (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	20% 20% 6% 11% 4 4 3 3 4 6% 19%	2836
	11th to 20th	Day	15% 24% 8% 11% 7% 4 4 3 3 4 17%	2840
	21st to end	Day	27% 21% 7% 11% 6% 4 3 2 3 3 13%	3124
February	1st to 10th	Day	20% 16% 5% 10% 6% 4 3 3 4 4 25%	1710
	11th to 20th	Day	16% 15% 6% 12% 5% 4 3 3 5% 5% 25%	1739
	21st to end	Day	19% 15% 4 9% 5% 4 3 3 3 4 30%	1570
March	1st to 10th	Day	22% 16% 4 8% 5% 5% 4 3 4 5% 25%	3375
	11th to 20th	Day	13% 10% 3 8% 5% 5% 5% 3 5% 6% 36%	3480
	21st to end	Day	22% 9% 3 8% 5% 4 4 3 5% 6% 33%	3815
April	1st to 10th	Day	15% 13% 3 7% 6% 4 4 4 5% 7% 32%	2116
	11th to 20th	Day	17% 9% 3 7% 5% 5% 5% 3 5% 7% 35%	2383
	21st to end	Day	19% 8% 2 7% 5% 5% 4 4 6% 8% 32%	2470
May	1st to 10th	Day	22% 10% 3 7% 5% 5% 5% 4 5% 6% 27%	4082
	11th to 20th	Day	20% 9% 3 7% 4 4 4 3 6% 7% 33%	4081
	21st to end	Day	12% 6% 2 7% 6% 6% 6% 5% 7% 9% 35%	4476
June	1st to 10th	Day	12% 8% 2 6% 5% 5% 5% 6% 7% 8% 36%	2486
	11th to 20th	Day	12% 6% 3 8% 5% 5% 6% 6% 7% 8% 35%	2613
	21st to end	Day	11% 6% 2 6% 5% 6% 6% 5% 8% 9% 36%	2470
July	1st to 10th	Day	11% 8% 2 6% 6% 5% 5% 4 7% 9% 36%	2470
	11th to 20th	Day	11% 7% 2 7% 5% 5% 5% 4 7% 8% 40%	2407
	21st to end	Day	11% 7% 2 7% 5% 6% 6% 5% 7% 10% 35%	2547
August	1st to 10th	Day	10% 5% 3 6% 6% 7% 6% 6% 8% 9% 34%	2327
	11th to 20th	Day	11% 7% 2 5% 6% 6% 7% 5% 7% 10% 34%	2303
	21st to end	Day	10% 5% 2 6% 5% 6% 5% 4 7% 10% 40%	2516
September	1st to 10th	Day	15% 6% 2 5% 4 3 4 3 5% 8% 45%	2051
	11th to 20th	Day	9% 6% 2 5% 4 5% 5% 3 6% 10% 45%	1980
	21st to end	Day	17% 8% 2 6% 5% 4 4 3 4 7% 39%	1980
October	1st to 10th	Day	13% 8% 3 6% 5% 5% 4 3 6% 7% 40%	1864
	11th to 20th	Day	17% 8% 2 7% 4 5% 5% 4 5% 5% 37%	1800
	21st to end	Day	23% 10% 3 6% 4 4 4 2 4 5% 35%	1980
November	1st to 10th	Day	11% 9% 3 7% 4 4 3 4 4 6% 46%	1704
	11th to 20th	Day	18% 13% 3 7% 5% 4 4 3 5% 5% 33%	1710
	21st to end	Day	18% 14% 5% 8% 5% 4 4 4 4 5% 29%	1583
December	1st to 10th	Day	21% 18% 7% 10% 4 4 4 4 3 5% 19%	1520
	11th to 20th	Day	19% 17% 6% 11% 6% 4 4 3 4 6% 21%	1910
	21st to end	Day	23% 23% 5% 10% 6% 4 4 3 3 5% 14%	3100
January	1st to 10th	Night	18% 21% 8% 12% 5% 5% 4 3 4 4 19%	4109
	11th to 20th	Night	16% 20% 6% 15% 5% 5% 6% 3 4 4 15%	4120
	21st to end	Night	28% 19% 7% 12% 4 3 2 2 3 3 17%	4532
February	1st to 10th	Night	21% 15% 4 9% 5% 4 4 3 4 4 26%	2470
	11th to 20th	Night	19% 15% 5% 10% 6% 5% 4 3 4 4 25%	2323
	21st to end	Night	21% 16% 4 9% 6% 4 4 2 4 5% 25%	1884
March	1st to 10th	Night	22% 13% 3 6% 4 4 3 2 4 5% 33%	3478
	11th to 20th	Night	16% 11% 4 8% 4 4 4 3 5% 6% 35%	3480
	21st to end	Night	19% 9% 2 6% 4 4 3 3 4 5% 39%	3817
April	1st to 10th	Night	18% 12% 3 7% 5% 4 4 3 5% 6% 34%	2062
	11th to 20th	Night	16% 8% 3 7% 4 4 4 4 6% 8% 36%	1761
	21st to end	Night	15% 9% 3 7% 4 4 5% 4 5% 7% 38%	1710
May	1st to 10th	Night	29% 9% 3 7% 4 5% 3 3 5% 6% 26%	2813
	11th to 20th	Night	18% 10% 3 6% 4 3 4 3 4 6% 40%	2812
	21st to end	Night	11% 5% 3 6% 5% 4 5% 5% 7% 9% 42%	3079
June	1st to 10th	Night	9% 6% 2 7% 5% 5% 4 4 6% 8% 44%	1676
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 8% 11% 43%	1546
	21st to end	Night	11% 5% 1 5% 5% 5% 4 4 6% 10% 44%	1710
July	1st to 10th	Night	8% 6% 3 7% 4 5% 5% 5% 6% 8% 44%	1710
	11th to 20th	Night	7% 4 2 6% 4 4 5% 4 7% 9% 47%	1674
	21st to end	Night	8% 6% 2 6% 6% 5% 5% 6% 8% 8% 39%	1771
August	1st to 10th	Night	5% 5% 2 7% 5% 5% 6% 6% 8% 9% 42%	1611
	11th to 20th	Night	9% 6% 2 8% 4 5% 5% 4 6% 7% 44%	1598
	21st to end	Night	8% 6% 2 4 4 4 5% 4 6% 9% 49%	1820
September	1st to 10th	Night	12% 5% 2 6% 4 4 5% 3 4 6% 49%	1907
	11th to 20th	Night	10% 4 1 4 3 4 4 2 6% 9% 52%	1980
	21st to end	Night	14% 7% 3 7% 4 4 4 3 5% 6% 45%	1980
October	1st to 10th	Night	14% 5% 2 6% 4 4 4 4 5% 6% 45%	2094
	11th to 20th	Night	16% 8% 3 7% 5% 5% 4 3 4 6% 39%	2160
	21st to end	Night	23% 9% 2 6% 4 4 4 3 5% 6% 35%	2376
November	1st to 10th	Night	13% 8% 2 6% 4 3 3 3 5% 7% 46%	2372
	11th to 20th	Night	18% 11% 3 7% 4 4 4 4 5% 6% 34%	2470
	21st to end	Night	21% 12% 4 7% 4 4 5% 4 5% 6% 29%	2591
December	1st to 10th	Night	23% 15% 6% 10% 4 4 4 3 4 5% 23%	2660
	11th to 20th	Night	18% 18% 6% 9% 5% 4 4 3 5% 6% 24%	3285
	21st to end	Night	23% 21% 5% 9% 5% 5% 4 3 4 5% 16%	4550

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	67% 5% 8% 13% 5%	2837
	11th to 20th	Day	72% 4 8% 12% 4 1	2840
	21st to end	Day	77% 4 6% 9% 3 1	3124
February	1st to 10th	Day	64% 3 10% 14% 8% 1	1710
	11th to 20th	Day	60% 5% 8% 17% 9% 1	1748
	21st to end	Day	60% 2 8% 19% 9% 2	1570
March	1st to 10th	Day	61% 4 8% 20% 6%	3375
	11th to 20th	Day	47% 7% 9% 26% 10% 1	3480
	21st to end	Day	51% 5% 9% 20% 14% 1	3815
April	1st to 10th	Day	52% 5% 10% 19% 11% 3	2116
	11th to 20th	Day	48% 5% 11% 17% 16% 3	2383
	21st to end	Day	50% 6% 9% 20% 13% 2	2470
May	1st to 10th	Day	56% 6% 8% 21% 8% 1	4120
	11th to 20th	Day	49% 6% 10% 22% 12% 1	4085
	21st to end	Day	41% 8% 13% 21% 12% 4	4489
June	1st to 10th	Day	43% 8% 11% 24% 13% 1	2486
	11th to 20th	Day	42% 7% 14% 23% 13% 1	2613
	21st to end	Day	41% 7% 14% 23% 13% 2	2470
July	1st to 10th	Day	43% 7% 13% 22% 13% 2	2405
	11th to 20th	Day	40% 6% 12% 26% 15% 1	2338
	21st to end	Day	41% 7% 14% 24% 13% 2	2405
August	1st to 10th	Day	41% 8% 13% 25% 13%	2314
	11th to 20th	Day	42% 7% 13% 27% 10% 1	2303
	21st to end	Day	38% 7% 12% 24% 14% 4	2516
September	1st to 10th	Day	38% 4 12% 22% 19% 4	2051
	11th to 20th	Day	35% 4 14% 27% 17% 2	1980
	21st to end	Day	46% 5% 9% 23% 17% 1	1980
October	1st to 10th	Day	43% 5% 10% 22% 19% 1	1864
	11th to 20th	Day	48% 5% 10% 23% 13% 1	1800
	21st to end	Day	53% 3 10% 21% 12% 1	1980
November	1st to 10th	Day	40% 4 9% 28% 15% 3	1704
	11th to 20th	Day	52% 4 8% 22% 10% 3	1710
	21st to end	Day	57% 5% 9% 19% 9% 1	1583
December	1st to 10th	Day	67% 5% 9% 15% 4	1520
	11th to 20th	Day	65% 4 9% 17% 5%	1906
	21st to end	Day	74% 5% 9% 8% 3	3100
January	1st to 10th	Night	69% 4 8% 14% 4	4109
	11th to 20th	Night	72% 4 10% 11% 3	4120
	21st to end	Night	74% 3 6% 13% 3 1	4532
February	1st to 10th	Night	62% 4 9% 16% 8% 1	2470
	11th to 20th	Night	62% 4 8% 17% 8% 1	2325
	21st to end	Night	63% 4 8% 15% 9% 2	1884
March	1st to 10th	Night	54% 4 7% 24% 10%	3478
	11th to 20th	Night	48% 6% 9% 28% 7% 1	3480
	21st to end	Night	47% 5% 8% 27% 12% 2	3817
April	1st to 10th	Night	50% 5% 9% 19% 14% 2	2062
	11th to 20th	Night	45% 5% 12% 18% 18% 3	1761
	21st to end	Night	45% 5% 11% 21% 16% 2	1710
May	1st to 10th	Night	59% 5% 8% 18% 8% 2	2840
	11th to 20th	Night	45% 7% 9% 25% 12% 1	2813
	21st to end	Night	35% 8% 14% 24% 14% 4	3087
June	1st to 10th	Night	37% 7% 11% 25% 18% 3	1676
	11th to 20th	Night	33% 7% 16% 23% 18% 3	1546
	21st to end	Night	35% 8% 13% 25% 17% 2	1710
July	1st to 10th	Night	37% 7% 11% 23% 19% 3	1665
	11th to 20th	Night	30% 7% 15% 26% 19% 3	1620
	21st to end	Night	37% 9% 13% 25% 14% 3	1672
August	1st to 10th	Night	34% 9% 15% 26% 17%	1600
	11th to 20th	Night	37% 8% 13% 25% 16% 2	1598
	21st to end	Night	31% 7% 14% 26% 18% 5%	1820
September	1st to 10th	Night	37% 5% 11% 21% 21% 6%	1907
	11th to 20th	Night	29% 5% 13% 27% 24% 2	1980
	21st to end	Night	40% 4 11% 22% 22% 1	1980
October	1st to 10th	Night	38% 5% 11% 23% 20% 2	2094
	11th to 20th	Night	46% 5% 8% 26% 15% 1	2160
	21st to end	Night	49% 4 9% 22% 13% 2	2376
November	1st to 10th	Night	38% 4 11% 25% 18% 4	2372
	11th to 20th	Night	51% 4 9% 21% 13% 2	2470
	21st to end	Night	56% 4 11% 21% 7% 1	2591
December	1st to 10th	Night	65% 3 9% 16% 5% 1	2660
	11th to 20th	Night	61% 4 11% 18% 5%	3288
	21st to end	Night	71% 5% 9% 12% 3	4550

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	34% 21% 30% 10% 5%	270
	11th to 20th	Day	37% 24% 30% 8% 1	270
	21st to end	Day	36% 23% 30% 9% 2	297
February	1st to 10th	Day	34% 20% 33% 9% 3	270
	11th to 20th	Day	39% 23% 31% 5% 1	270
	21st to end	Day	38% 24% 32% 6%	225
March	1st to 10th	Day	31% 21% 29% 15% 5%	422
	11th to 20th	Day	31% 19% 31% 13% 5% 1	460
	21st to end	Day	33% 17% 31% 15% 4	506
April	1st to 10th	Day	28% 18% 32% 15% 7% 1	460
	11th to 20th	Day	28% 17% 28% 16% 8% 3	452
	21st to end	Day	27% 16% 35% 14% 6% 2	460
May	1st to 10th	Day	30% 15% 29% 16% 8% 2	463
	11th to 20th	Day	23% 10% 31% 22% 8% 6%	487
	21st to end	Day	15% 8% 25% 28% 17% 6%	529
June	1st to 10th	Day	18% 7% 28% 29% 14% 5%	490
	11th to 20th	Day	18% 9% 24% 31% 14% 6%	490
	21st to end	Day	13% 7% 32% 28% 15% 4	490
July	1st to 10th	Day	17% 4 20% 25% 19% 14%	485
	11th to 20th	Day	15% 4 23% 30% 19% 9%	465
	21st to end	Day	16% 4 22% 28% 18% 12%	488
August	1st to 10th	Day	14% 3 17% 34% 22% 11%	446
	11th to 20th	Day	18% 4 17% 32% 19% 10%	439
	21st to end	Day	12% 4 23% 29% 23% 10%	495
September	1st to 10th	Day	18% 4 20% 28% 21% 10%	450
	11th to 20th	Day	12% 4 16% 29% 27% 11%	450
	21st to end	Day	23% 8% 23% 25% 16% 6%	450
October	1st to 10th	Day	17% 7% 26% 27% 19% 4	450
	11th to 20th	Day	23% 12% 30% 24% 11%	450
	21st to end	Day	32% 12% 30% 19% 7% 1	495
November	1st to 10th	Day	21% 15% 35% 15% 11% 3	302
	11th to 20th	Day	30% 15% 29% 18% 6% 2	270
	21st to end	Day	25% 21% 39% 13% 2	210
December	1st to 10th	Day	32% 21% 32% 9% 4 2	180
	11th to 20th	Day	31% 22% 32% 11% 3	180
	21st to end	Day	38% 18% 32% 10% 3	292
January	1st to 10th	Night	31% 17% 33% 14% 4	760
	11th to 20th	Night	32% 17% 31% 16% 3	760
	21st to end	Night	31% 19% 28% 19% 2	836
February	1st to 10th	Night	31% 17% 29% 21% 3	760
	11th to 20th	Night	30% 20% 32% 17% 1	743
	21st to end	Night	30% 17% 34% 17% 2	628
March	1st to 10th	Night	26% 17% 29% 24% 4	760
	11th to 20th	Night	26% 18% 27% 22% 6% 1	760
	21st to end	Night	29% 14% 31% 20% 5% 1	836
April	1st to 10th	Night	25% 15% 32% 23% 6%	760
	11th to 20th	Night	20% 13% 36% 22% 9% 1	637
	21st to end	Night	20% 9% 36% 28% 6% 1	570
May	1st to 10th	Night	22% 9% 27% 28% 13% 1	570
	11th to 20th	Night	21% 7% 23% 34% 14% 1	561
	21st to end	Night	12% 4 21% 36% 26% 3	617
June	1st to 10th	Night	11% 4 26% 37% 21% 1	536
	11th to 20th	Night	14% 4 22% 37% 23% 1	406
	21st to end	Night	13% 3 21% 38% 23% 2	570
July	1st to 10th	Night	11% 2 15% 40% 25% 6%	555
	11th to 20th	Night	10% 2 17% 38% 28% 5%	540
	21st to end	Night	11% 2 13% 39% 30% 4	591
August	1st to 10th	Night	8% 3 12% 41% 33% 4	537
	11th to 20th	Night	11% 3 11% 36% 33% 6%	534
	21st to end	Night	11% 1 18% 31% 32% 6%	632
September	1st to 10th	Night	14% 3 16% 31% 31% 5%	720
	11th to 20th	Night	11% 4 14% 34% 32% 5%	720
	21st to end	Night	17% 7% 21% 31% 20% 4	720
October	1st to 10th	Night	16% 6% 20% 33% 22% 3	720
	11th to 20th	Night	21% 10% 28% 29% 11% 1	720
	21st to end	Night	29% 10% 26% 26% 8% 1	792
November	1st to 10th	Night	19% 9% 29% 30% 13% 1	740
	11th to 20th	Night	26% 13% 29% 22% 9% 1	760
	21st to end	Night	29% 13% 27% 26% 5%	760
December	1st to 10th	Night	34% 13% 28% 19% 5%	760
	11th to 20th	Night	29% 15% 29% 22% 4	760
	21st to end	Night	34% 13% 30% 21% 2	836

Page generated at 2024-07-13 10:19:52. Version ac07

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