Scofield State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Scofield State Park clear sky chart from 2005-11-06 to 2024-11-01.

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	3 7% 3 7% 5% 5% 5% 4 6% 7% 49%	100926
	Night	2 5% 2 7% 5% 4 4 4 6% 7% 52%	98256
Transparency	Day	32% 4 9% 22% 21% 12%	100691
	Night	27% 3 11% 26% 22% 11%	98080
Seeing	Day	12% 20% 32% 23% 10% 3	14924
	Night	7% 15% 25% 32% 18% 3	25339

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 5% 4 14% 7% 7% 5% 5% 7% 9% 37%	2858
	11th to 20th	Day	1 7% 4 12% 9% 8% 6% 5% 7% 7% 35%	2860
	21st to end	Day	2 11% 7% 12% 4 3 3 3 4 6% 46%	3146
February	1st to 10th	Day	1 9% 5% 11% 6% 5% 4 4 6% 7% 44%	1710
	11th to 20th	Day	3 11% 5% 9% 4 3 4 5% 7% 8% 42%	1707
	21st to end	Day	2 10% 4 11% 7% 5% 5% 4 5% 7% 40%	1570
March	1st to 10th	Day	2 8% 5% 12% 5% 5% 5% 3 7% 8% 41%	3430
	11th to 20th	Day	3 15% 4 9% 4 4 5% 4 5% 6% 41%	3490
	21st to end	Day	3 17% 6% 13% 6% 5% 6% 4 6% 6% 26%	3825
April	1st to 10th	Day	3 9% 3 8% 5% 5% 6% 4 6% 7% 43%	2133
	11th to 20th	Day	4 9% 3 9% 6% 6% 5% 4 6% 6% 43%	2327
	21st to end	Day	5% 10% 3 7% 5% 5% 4 3 6% 7% 45%	2470
May	1st to 10th	Day	5% 9% 5% 8% 5% 5% 5% 5% 6% 6% 41%	4110
	11th to 20th	Day	4 6% 2 5% 5% 5% 5% 5% 7% 8% 47%	4071
	21st to end	Day	5% 8% 2 6% 5% 5% 5% 4 6% 8% 46%	4477
June	1st to 10th	Day	4 5% 1 5% 4 4 5% 4 6% 8% 54%	2536
	11th to 20th	Day	5% 4 2 5% 3 3 4 3 4 6% 61%	2657
	21st to end	Day	3 4 1 4 4 4 4 3 5% 6% 63%	2470
July	1st to 10th	Day	3 3 1 3 3 3 4 3 4 4 70%	4110
	11th to 20th	Day	4 4 2 6% 6% 7% 6% 6% 9% 8% 42%	4110
	21st to end	Day	3 4 1 5% 5% 5% 5% 5% 7% 7% 52%	4454
August	1st to 10th	Day	4 4 2 5% 5% 5% 7% 5% 8% 8% 48%	4092
	11th to 20th	Day	3 2 1 5% 5% 6% 6% 5% 6% 7% 55%	4028
	21st to end	Day	3 3 1 5% 4 5% 5% 4 6% 7% 57%	4407
September	1st to 10th	Day	4 4 2 5% 4 4 4 3 5% 6% 59%	2186
	11th to 20th	Day	5% 4 1 5% 4 4 3 3 5% 6% 60%	2090
	21st to end	Day	5% 5% 2 4 3 2 2 2 5% 5% 65%	2090
October	1st to 10th	Day	7% 7% 2 5% 4 5% 3 3 4 5% 55%	1971
	11th to 20th	Day	5% 5% 2 5% 3 3 3 3 4 6% 61%	1900
	21st to end	Day	3 5% 2 6% 3 3 3 4 4 6% 61%	2090
November	1st to 10th	Day	3 7% 2 6% 4 4 3 4 6% 8% 54%	1738
	11th to 20th	Day	2 5% 2 5% 3 3 5% 4 7% 7% 57%	1710
	21st to end	Day	2 6% 4 7% 5% 4 4 4 6% 7% 52%	1561
December	1st to 10th	Day	1 6% 3 8% 6% 5% 4 4 7% 8% 48%	1520
	11th to 20th	Day	1 8% 3 9% 6% 5% 6% 6% 7% 9% 40%	1926
	21st to end	Day	2 7% 4 11% 6% 5% 5% 4 7% 8% 42%	3096
January	1st to 10th	Night	1 5% 3 19% 10% 5% 4 3 5% 6% 40%	4097
	11th to 20th	Night	1 4 3 15% 10% 9% 6% 4 6% 7% 36%	4110
	21st to end	Night	1 10% 6% 13% 5% 3 3 3 5% 8% 42%	4521
February	1st to 10th	Night	1 7% 3 7% 5% 6% 5% 4 6% 9% 48%	2470
	11th to 20th	Night	1 6% 3 8% 5% 4 5% 5% 7% 9% 47%	2357
	21st to end	Night	2 5% 3 6% 5% 5% 5% 6% 7% 7% 48%	1884
March	1st to 10th	Night	1 4 3 7% 5% 5% 5% 5% 7% 9% 49%	3444
	11th to 20th	Night	1 8% 3 9% 5% 5% 5% 4 6% 7% 46%	3490
	21st to end	Night	1 9% 4 13% 6% 5% 5% 5% 6% 6% 40%	3828
April	1st to 10th	Night	2 6% 2 6% 5% 5% 5% 4 6% 7% 52%	2047
	11th to 20th	Night	4 6% 3 7% 4 4 4 4 6% 8% 50%	1799
	21st to end	Night	3 6% 2 5% 4 4 4 4 7% 9% 53%	1710
May	1st to 10th	Night	3 8% 2 9% 6% 5% 5% 4 7% 8% 44%	2860
	11th to 20th	Night	2 4 2 5% 4 4 4 4 5% 6% 59%	2834
	21st to end	Night	4 5% 1 5% 3 3 4 3 5% 8% 58%	3110
June	1st to 10th	Night	4 4 1 3 3 4 3 5% 7% 9% 56%	1633
	11th to 20th	Night	3 3 1 4 3 3 4 3 4 5% 66%	1520
	21st to end	Night	2 1 1 3 3 4 5% 4 5% 6% 67%	1699
July	1st to 10th	Night	2 2 1 4 3 3 4 3 3 4 73%	2860
	11th to 20th	Night	3 4 2 5% 4 4 5% 5% 9% 10% 48%	2860
	21st to end	Night	3 2 2 6% 4 4 6% 6% 6% 8% 54%	3109
August	1st to 10th	Night	3 4 1 5% 4 5% 5% 5% 6% 9% 54%	2847
	11th to 20th	Night	3 3 2 6% 4 4 5% 4 6% 7% 56%	2811
	21st to end	Night	2 2 1 5% 4 3 3 3 4 6% 66%	3260
September	1st to 10th	Night	3 3 1 3 2 2 3 3 5% 7% 67%	1990
	11th to 20th	Night	3 2 1 3 3 4 3 3 4 7% 67%	2090
	21st to end	Night	5% 3 1 4 2 3 2 2 4 5% 69%	2090
October	1st to 10th	Night	4 5% 1 5% 3 3 3 3 4 6% 62%	2209
	11th to 20th	Night	2 3 2 5% 3 3 3 3 5% 6% 64%	2280
	21st to end	Night	3 4 2 5% 4 3 3 3 5% 6% 62%	2508
November	1st to 10th	Night	2 5% 2 5% 4 3 4 4 6% 7% 59%	2347
	11th to 20th	Night	1 4 1 4 4 4 4 4 7% 8% 58%	2470
	21st to end	Night	2 6% 2 7% 5% 4 4 4 6% 8% 54%	2596
December	1st to 10th	Night	2 6% 3 8% 5% 4 4 4 7% 8% 50%	2660
	11th to 20th	Night	2 7% 3 7% 7% 6% 5% 5% 8% 8% 42%	3271
	21st to end	Night	2 7% 3 9% 8% 6% 5% 5% 7% 8% 38%	4585

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	36% 6% 12% 31% 14% 1	2859
	11th to 20th	Day	34% 5% 20% 26% 13% 2	2860
	21st to end	Day	36% 3 18% 26% 14% 3	3146
February	1st to 10th	Day	37% 6% 19% 21% 14% 4	1710
	11th to 20th	Day	34% 4 15% 26% 18% 2	1716
	21st to end	Day	40% 3 11% 28% 16% 2	1570
March	1st to 10th	Day	39% 2 9% 31% 14% 5%	3430
	11th to 20th	Day	44% 2 13% 27% 12% 3	3490
	21st to end	Day	53% 3 10% 24% 9% 1	3825
April	1st to 10th	Day	37% 4 11% 25% 19% 5%	2133
	11th to 20th	Day	39% 3 10% 26% 20% 2	2330
	21st to end	Day	36% 3 8% 32% 20% 1	2470
May	1st to 10th	Day	36% 3 4 24% 27% 5%	4110
	11th to 20th	Day	34% 3 4 28% 29% 2	4074
	21st to end	Day	35% 3 5% 25% 28% 4	4477
June	1st to 10th	Day	27% 3 6% 22% 33% 9%	2536
	11th to 20th	Day	25% 3 4 15% 31% 21%	2657
	21st to end	Day	22% 3 2 14% 27% 32%	2470
July	1st to 10th	Day	18% 4 2 7% 11% 58%	4046
	11th to 20th	Day	33% 6% 4 15% 22% 21%	4041
	21st to end	Day	28% 4 6% 14% 18% 29%	4314
August	1st to 10th	Day	30% 5% 9% 24% 18% 16%	4078
	11th to 20th	Day	27% 4 9% 13% 29% 18%	4067
	21st to end	Day	26% 4 6% 17% 22% 25%	4406
September	1st to 10th	Day	26% 4 6% 14% 27% 24%	2186
	11th to 20th	Day	27% 3 7% 17% 26% 20%	2090
	21st to end	Day	22% 3 4 20% 37% 14%	2090
October	1st to 10th	Day	32% 2 6% 20% 28% 11%	1971
	11th to 20th	Day	24% 3 5% 29% 32% 8%	1900
	21st to end	Day	24% 3 11% 32% 26% 5%	2090
November	1st to 10th	Day	27% 5% 12% 28% 23% 6%	1738
	11th to 20th	Day	22% 4 18% 31% 23% 3	1710
	21st to end	Day	29% 3 12% 29% 21% 5%	1561
December	1st to 10th	Day	29% 6% 22% 26% 12% 5%	1520
	11th to 20th	Day	35% 4 17% 28% 15% 2	1924
	21st to end	Day	37% 3 13% 16% 20% 11%	3096
January	1st to 10th	Night	35% 3 14% 27% 19% 2	4097
	11th to 20th	Night	34% 3 20% 27% 12% 4	4110
	21st to end	Night	36% 2 17% 27% 15% 3	4521
February	1st to 10th	Night	28% 6% 20% 28% 15% 3	2470
	11th to 20th	Night	28% 5% 12% 28% 23% 3	2358
	21st to end	Night	27% 4 14% 30% 20% 5%	1884
March	1st to 10th	Night	28% 2 12% 37% 18% 3	3444
	11th to 20th	Night	37% 2 10% 34% 15% 3	3490
	21st to end	Night	39% 2 12% 27% 17% 2	3828
April	1st to 10th	Night	27% 5% 14% 26% 21% 7%	2047
	11th to 20th	Night	28% 4 10% 31% 23% 3	1799
	21st to end	Night	25% 2 12% 36% 22% 2	1710
May	1st to 10th	Night	32% 2 5% 26% 27% 6%	2860
	11th to 20th	Night	26% 3 6% 32% 30% 4	2835
	21st to end	Night	25% 3 7% 31% 29% 5%	3110
June	1st to 10th	Night	23% 3 7% 28% 29% 10%	1633
	11th to 20th	Night	20% 3 5% 17% 31% 24%	1520
	21st to end	Night	17% 3 3 12% 27% 37%	1699
July	1st to 10th	Night	16% 3 3 8% 13% 57%	2815
	11th to 20th	Night	27% 4 6% 17% 24% 23%	2806
	21st to end	Night	26% 4 8% 18% 16% 28%	3011
August	1st to 10th	Night	27% 3 9% 24% 19% 19%	2838
	11th to 20th	Night	27% 3 9% 17% 22% 22%	2838
	21st to end	Night	19% 5% 5% 16% 29% 26%	3260
September	1st to 10th	Night	18% 3 7% 17% 29% 26%	1990
	11th to 20th	Night	19% 2 8% 22% 25% 23%	2090
	21st to end	Night	19% 2 3 19% 38% 19%	2090
October	1st to 10th	Night	24% 3 7% 25% 28% 13%	2209
	11th to 20th	Night	19% 3 6% 27% 36% 9%	2280
	21st to end	Night	20% 2 12% 33% 27% 6%	2508
November	1st to 10th	Night	22% 4 11% 31% 24% 7%	2347
	11th to 20th	Night	19% 3 16% 34% 24% 4	2470
	21st to end	Night	26% 4 12% 28% 24% 8%	2596
December	1st to 10th	Night	28% 4 19% 28% 15% 5%	2660
	11th to 20th	Night	33% 5% 15% 29% 15% 3	3272
	21st to end	Night	36% 3 14% 21% 17% 9%	4585

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	17% 21% 30% 24% 7% 1	270
	11th to 20th	Day	17% 24% 25% 26% 6% 2	270
	21st to end	Day	10% 29% 31% 19% 10%	297
February	1st to 10th	Day	15% 36% 30% 12% 6%	270
	11th to 20th	Day	15% 33% 30% 15% 6% 1	312
	21st to end	Day	15% 33% 37% 13% 2 1	382
March	1st to 10th	Day	15% 28% 35% 17% 5%	460
	11th to 20th	Day	14% 23% 34% 22% 5% 1	460
	21st to end	Day	17% 30% 39% 12% 3	506
April	1st to 10th	Day	17% 28% 31% 14% 9% 2	460
	11th to 20th	Day	18% 30% 37% 10% 5% 1	452
	21st to end	Day	19% 28% 28% 17% 7% 2	460
May	1st to 10th	Day	20% 27% 34% 13% 5% 1	463
	11th to 20th	Day	15% 19% 35% 19% 9% 2	488
	21st to end	Day	14% 20% 29% 22% 12% 3	529
June	1st to 10th	Day	7% 17% 37% 26% 11% 2	556
	11th to 20th	Day	11% 19% 34% 22% 11% 3	677
	21st to end	Day	6% 18% 39% 29% 8% 1	490
July	1st to 10th	Day	8% 11% 30% 35% 12% 4	486
	11th to 20th	Day	5% 7% 33% 36% 14% 4	484
	21st to end	Day	6% 5% 25% 39% 20% 5%	531
August	1st to 10th	Day	7% 6% 36% 33% 15% 3	487
	11th to 20th	Day	5% 9% 34% 33% 14% 4	477
	21st to end	Day	6% 10% 33% 29% 17% 5%	539
September	1st to 10th	Day	6% 13% 28% 29% 16% 8%	490
	11th to 20th	Day	10% 17% 30% 24% 15% 4	490
	21st to end	Day	9% 16% 28% 28% 14% 5%	490
October	1st to 10th	Day	14% 17% 26% 22% 14% 6%	371
	11th to 20th	Day	11% 19% 28% 23% 16% 3	300
	21st to end	Day	12% 24% 30% 22% 11% 1	330
November	1st to 10th	Day	14% 27% 23% 21% 14% 1	270
	11th to 20th	Day	10% 18% 38% 21% 9% 4	270
	21st to end	Day	9% 19% 31% 26% 13% 2	270
December	1st to 10th	Day	11% 17% 35% 25% 9% 3	270
	11th to 20th	Day	7% 27% 30% 28% 8%	270
	21st to end	Day	14% 24% 34% 20% 7% 1	297
January	1st to 10th	Night	7% 17% 28% 27% 16% 4	760
	11th to 20th	Night	8% 18% 28% 31% 13% 3	760
	21st to end	Night	8% 21% 25% 30% 14% 3	836
February	1st to 10th	Night	9% 24% 31% 24% 9% 4	760
	11th to 20th	Night	5% 26% 28% 29% 9% 2	744
	21st to end	Night	9% 22% 33% 27% 7% 1	628
March	1st to 10th	Night	5% 19% 30% 32% 11% 2	760
	11th to 20th	Night	6% 15% 27% 34% 17% 2	760
	21st to end	Night	8% 23% 31% 27% 9% 2	836
April	1st to 10th	Night	12% 18% 31% 27% 11% 1	717
	11th to 20th	Night	10% 20% 34% 25% 9% 1	563
	21st to end	Night	8% 23% 30% 24% 14% 2	570
May	1st to 10th	Night	10% 18% 28% 29% 13% 2	570
	11th to 20th	Night	7% 10% 26% 33% 20% 3	561
	21st to end	Night	9% 14% 24% 29% 21% 2	617
June	1st to 10th	Night	7% 11% 27% 31% 22% 3	570
	11th to 20th	Night	6% 17% 26% 35% 14% 2	570
	21st to end	Night	3 8% 26% 39% 22% 3	570
July	1st to 10th	Night	5% 6% 20% 28% 35% 6%	555
	11th to 20th	Night	5% 4 15% 38% 33% 5%	552
	21st to end	Night	6% 3 9% 38% 38% 6%	624
August	1st to 10th	Night	5% 4 14% 41% 32% 4	567
	11th to 20th	Night	6% 3 16% 39% 32% 4	564
	21st to end	Night	5% 4 16% 37% 33% 5%	627
September	1st to 10th	Night	5% 4 17% 35% 33% 6%	660
	11th to 20th	Night	5% 5% 19% 38% 26% 8%	760
	21st to end	Night	7% 9% 18% 30% 27% 9%	760
October	1st to 10th	Night	6% 11% 23% 34% 23% 3	760
	11th to 20th	Night	5% 15% 22% 31% 23% 4	760
	21st to end	Night	7% 17% 23% 32% 17% 5%	836
November	1st to 10th	Night	7% 14% 25% 33% 18% 4	742
	11th to 20th	Night	7% 19% 25% 30% 14% 4	760
	21st to end	Night	8% 18% 22% 31% 16% 4	886
December	1st to 10th	Night	9% 18% 31% 30% 12% 2	950
	11th to 20th	Night	8% 19% 28% 32% 12% 1	950
	21st to end	Night	11% 19% 29% 31% 8% 1	874

Page generated at 2024-10-29 09:20:45. Version ac07

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