Paint Mines Interpretive Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paint Mines Interpretive Park clear sky chart from 2005-11-06 to 2025-05-11.

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	4 5% 2 5% 4 4 4 4 6% 8% 56%	117728
	Night	4 5% 2 6% 4 4 4 4 5% 7% 56%	120105
Transparency	Day	24% 6% 10% 23% 25% 11%	117470
	Night	25% 6% 11% 24% 24% 10%	119953
Seeing	Day	7% 9% 29% 30% 19% 6%	16183
	Night	6% 6% 32% 39% 15% 2	26308

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 6% 2 5% 4 3 4 3 6% 9% 57%	3638
	11th to 20th	Day	1 3 2 5% 4 4 4 4 7% 8% 58%	3704
	21st to end	Day	2 5% 2 6% 3 3 3 3 4 6% 63%	4510
February	1st to 10th	Day	2 8% 2 5% 4 3 4 3 6% 7% 57%	1854
	11th to 20th	Day	1 5% 2 6% 5% 4 4 4 5% 6% 58%	1949
	21st to end	Day	1 6% 3 7% 4 4 3 4 4 6% 59%	1650
March	1st to 10th	Day	1 4 2 6% 3 3 3 4 5% 5% 62%	4500
	11th to 20th	Day	4 8% 3 6% 4 4 4 3 5% 7% 53%	4807
	21st to end	Day	2 5% 2 6% 5% 4 5% 4 6% 9% 52%	5913
April	1st to 10th	Day	5% 7% 2 4 3 3 5% 4 5% 8% 54%	2400
	11th to 20th	Day	6% 9% 2 6% 4 4 4 3 6% 7% 47%	2371
	21st to end	Day	8% 7% 1 5% 5% 4 5% 4 6% 8% 47%	2400
May	1st to 10th	Day	9% 6% 2 6% 5% 4 4 3 5% 7% 49%	4179
	11th to 20th	Day	7% 6% 2 6% 5% 5% 5% 4 7% 8% 45%	4221
	21st to end	Day	5% 4 1 4 4 4 5% 5% 8% 10% 49%	4825
June	1st to 10th	Day	6% 4 2 4 3 5% 5% 4 8% 10% 50%	2660
	11th to 20th	Day	5% 3 1 4 3 4 5% 4 7% 9% 53%	2660
	21st to end	Day	3 4 2 4 5% 5% 5% 5% 8% 10% 49%	2660
July	1st to 10th	Day	4 3 1 5% 4 5% 6% 5% 7% 10% 49%	4430
	11th to 20th	Day	3 3 1 5% 4 6% 6% 5% 8% 9% 48%	4430
	21st to end	Day	5% 3 1 5% 5% 5% 5% 4 6% 8% 53%	4774
August	1st to 10th	Day	9% 4 2 5% 5% 5% 6% 5% 8% 10% 41%	3971
	11th to 20th	Day	4 3 1 4 4 5% 6% 5% 8% 10% 50%	3726
	21st to end	Day	4 3 1 5% 4 5% 6% 5% 8% 10% 50%	4180
September	1st to 10th	Day	4 3 1 4 4 4 4 4 6% 7% 58%	2280
	11th to 20th	Day	5% 3 1 4 3 3 4 3 5% 7% 62%	2218
	21st to end	Day	5% 3 2 4 2 3 3 3 5% 6% 65%	2090
October	1st to 10th	Day	4 3 1 2 1 2 2 2 3 4 75%	3304
	11th to 20th	Day	5% 5% 2 5% 3 3 3 2 5% 7% 61%	3150
	21st to end	Day	4 3 2 4 2 2 2 2 4 5% 71%	3262
November	1st to 10th	Day	3 4 1 3 3 3 2 4 5% 8% 64%	1763
	11th to 20th	Day	2 6% 2 4 4 3 3 3 4 5% 67%	1800
	21st to end	Day	2 6% 2 4 2 3 3 2 5% 7% 65%	1799
December	1st to 10th	Day	1 5% 2 4 2 2 3 3 4 5% 70%	2620
	11th to 20th	Day	1 4 2 3 3 3 3 3 5% 7% 66%	3026
	21st to end	Day	2 5% 2 5% 3 3 3 3 5% 8% 59%	4004
January	1st to 10th	Night	1 7% 3 7% 5% 3 3 3 6% 7% 54%	6327
	11th to 20th	Night	1 5% 2 5% 4 3 4 4 6% 7% 59%	6317
	21st to end	Night	1 4 2 6% 4 4 4 3 4 5% 63%	6468
February	1st to 10th	Night	2 6% 3 6% 3 3 3 4 5% 7% 58%	2545
	11th to 20th	Night	2 7% 3 8% 4 4 4 4 6% 7% 51%	2338
	21st to end	Night	2 5% 3 5% 3 3 3 3 5% 6% 62%	1980
March	1st to 10th	Night	1 6% 2 8% 4 4 3 3 4 5% 60%	5374
	11th to 20th	Night	5% 9% 2 6% 3 3 3 3 5% 6% 54%	5181
	21st to end	Night	5% 7% 2 5% 4 4 4 4 5% 8% 51%	5040
April	1st to 10th	Night	5% 7% 2 5% 3 3 4 3 6% 7% 54%	2000
	11th to 20th	Night	7% 8% 2 6% 4 4 3 3 6% 7% 48%	1977
	21st to end	Night	9% 8% 3 6% 4 5% 4 4 6% 7% 46%	2000
May	1st to 10th	Night	8% 7% 2 5% 4 4 4 4 6% 7% 49%	3010
	11th to 20th	Night	7% 7% 3 6% 4 4 4 4 6% 9% 45%	2687
	21st to end	Night	6% 6% 2 6% 4 5% 5% 5% 6% 8% 48%	2762
June	1st to 10th	Night	5% 3 2 4 4 4 5% 5% 8% 10% 51%	1520
	11th to 20th	Night	3 4 1 5% 4 4 4 4 5% 9% 57%	1520
	21st to end	Night	4 5% 2 5% 5% 5% 5% 5% 6% 8% 49%	1520
July	1st to 10th	Night	7% 4 2 6% 5% 5% 5% 5% 6% 8% 48%	2540
	11th to 20th	Night	3 3 1 5% 5% 5% 6% 5% 9% 10% 47%	2540
	21st to end	Night	4 4 2 5% 4 4 5% 4 6% 8% 54%	2785
August	1st to 10th	Night	9% 7% 3 8% 6% 6% 6% 5% 8% 9% 34%	2965
	11th to 20th	Night	5% 5% 2 7% 5% 6% 6% 5% 7% 10% 43%	3113
	21st to end	Night	3 3 1 5% 4 5% 6% 6% 10% 11% 44%	3487
September	1st to 10th	Night	5% 4 2 6% 3 4 5% 4 6% 8% 53%	1900
	11th to 20th	Night	5% 3 1 4 3 3 4 4 5% 8% 60%	1961
	21st to end	Night	5% 4 1 4 3 3 3 3 4 6% 63%	2090
October	1st to 10th	Night	5% 3 1 4 3 2 3 2 4 5% 69%	3658
	11th to 20th	Night	6% 5% 2 4 2 3 3 3 6% 8% 57%	3778
	21st to end	Night	3 4 1 4 3 3 3 3 4 5% 67%	4263
November	1st to 10th	Night	2 5% 2 3 3 2 2 3 5% 7% 67%	2535
	11th to 20th	Night	2 4 2 4 3 2 3 3 4 5% 69%	2600
	21st to end	Night	3 6% 2 6% 3 3 3 3 4 6% 62%	2600
December	1st to 10th	Night	1 3 2 4 2 2 3 2 4 6% 71%	4569
	11th to 20th	Night	1 4 2 5% 3 3 4 3 5% 8% 63%	5181
	21st to end	Night	2 6% 2 6% 4 4 5% 4 6% 7% 55%	6974

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	21% 5% 10% 30% 23% 11%	3639
	11th to 20th	Day	22% 5% 11% 22% 28% 12%	3704
	21st to end	Day	23% 4 7% 26% 27% 12%	4510
February	1st to 10th	Day	25% 4 11% 26% 22% 11%	1854
	11th to 20th	Day	25% 5% 8% 27% 27% 8%	1959
	21st to end	Day	26% 4 6% 21% 24% 19%	1650
March	1st to 10th	Day	17% 7% 7% 16% 33% 20%	4500
	11th to 20th	Day	29% 6% 8% 22% 27% 8%	4807
	21st to end	Day	24% 7% 10% 37% 18% 3	5913
April	1st to 10th	Day	26% 6% 12% 25% 22% 9%	2400
	11th to 20th	Day	32% 7% 12% 21% 19% 10%	2374
	21st to end	Day	31% 7% 12% 26% 21% 4	2400
May	1st to 10th	Day	31% 7% 11% 23% 17% 11%	4179
	11th to 20th	Day	31% 8% 16% 22% 20% 3	4225
	21st to end	Day	22% 10% 15% 23% 20% 10%	4825
June	1st to 10th	Day	25% 8% 15% 26% 16% 10%	2660
	11th to 20th	Day	23% 7% 11% 19% 24% 16%	2660
	21st to end	Day	24% 8% 12% 21% 23% 12%	2660
July	1st to 10th	Day	25% 8% 11% 16% 26% 13%	4361
	11th to 20th	Day	25% 9% 12% 23% 22% 10%	4355
	21st to end	Day	25% 7% 11% 19% 19% 18%	4623
August	1st to 10th	Day	33% 9% 16% 25% 11% 5%	3957
	11th to 20th	Day	26% 8% 13% 19% 22% 12%	3762
	21st to end	Day	26% 7% 13% 21% 25% 8%	4179
September	1st to 10th	Day	22% 5% 10% 23% 24% 15%	2280
	11th to 20th	Day	21% 4 10% 17% 30% 19%	2218
	21st to end	Day	20% 4 6% 20% 35% 14%	2090
October	1st to 10th	Day	14% 2 7% 17% 38% 22%	3304
	11th to 20th	Day	22% 3 8% 24% 33% 9%	3150
	21st to end	Day	17% 3 5% 21% 38% 15%	3262
November	1st to 10th	Day	17% 4 10% 23% 28% 17%	1763
	11th to 20th	Day	20% 3 6% 26% 33% 12%	1800
	21st to end	Day	20% 3 9% 22% 29% 17%	1799
December	1st to 10th	Day	18% 3 7% 31% 31% 10%	2620
	11th to 20th	Day	18% 3 6% 30% 31% 10%	3024
	21st to end	Day	23% 4 9% 28% 25% 11%	4004
January	1st to 10th	Night	27% 5% 8% 29% 24% 7%	6327
	11th to 20th	Night	22% 5% 11% 24% 24% 13%	6317
	21st to end	Night	23% 5% 9% 26% 25% 12%	6468
February	1st to 10th	Night	25% 5% 10% 26% 23% 10%	2545
	11th to 20th	Night	30% 5% 10% 28% 19% 7%	2338
	21st to end	Night	22% 4 8% 25% 26% 16%	1980
March	1st to 10th	Night	21% 7% 7% 14% 37% 14%	5374
	11th to 20th	Night	29% 5% 11% 16% 29% 11%	5181
	21st to end	Night	29% 6% 12% 33% 18% 2	5040
April	1st to 10th	Night	27% 6% 12% 24% 22% 9%	2000
	11th to 20th	Night	33% 5% 13% 23% 19% 8%	1977
	21st to end	Night	35% 6% 13% 25% 16% 5%	2000
May	1st to 10th	Night	31% 8% 14% 24% 15% 8%	3010
	11th to 20th	Night	34% 8% 16% 25% 10% 7%	2688
	21st to end	Night	29% 10% 15% 23% 17% 6%	2762
June	1st to 10th	Night	26% 9% 21% 23% 15% 8%	1520
	11th to 20th	Night	21% 7% 15% 23% 18% 15%	1520
	21st to end	Night	30% 6% 10% 24% 20% 10%	1520
July	1st to 10th	Night	30% 8% 12% 20% 25% 6%	2500
	11th to 20th	Night	24% 9% 17% 27% 19% 4	2492
	21st to end	Night	25% 9% 14% 20% 19% 13%	2698
August	1st to 10th	Night	41% 12% 16% 18% 9% 4	2956
	11th to 20th	Night	34% 9% 15% 20% 17% 4	3143
	21st to end	Night	27% 9% 16% 27% 17% 5%	3487
September	1st to 10th	Night	27% 7% 10% 21% 24% 11%	1900
	11th to 20th	Night	21% 6% 10% 23% 25% 15%	1961
	21st to end	Night	22% 5% 8% 22% 32% 11%	2090
October	1st to 10th	Night	17% 4 7% 20% 35% 17%	3658
	11th to 20th	Night	24% 5% 8% 27% 27% 10%	3778
	21st to end	Night	19% 5% 7% 26% 28% 16%	4263
November	1st to 10th	Night	18% 4 11% 24% 27% 16%	2535
	11th to 20th	Night	18% 3 8% 27% 32% 13%	2600
	21st to end	Night	23% 3 10% 21% 30% 13%	2600
December	1st to 10th	Night	16% 4 7% 31% 33% 10%	4569
	11th to 20th	Night	20% 4 6% 26% 36% 8%	5182
	21st to end	Night	25% 6% 10% 22% 25% 11%	6974

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	5% 8% 33% 35% 16% 3	300
	11th to 20th	Day	7% 12% 34% 34% 12% 1	300
	21st to end	Day	5% 12% 33% 32% 14% 3	330
February	1st to 10th	Day	3 15% 46% 26% 8% 2	300
	11th to 20th	Day	4 13% 45% 29% 8% 1	300
	21st to end	Day	2 14% 47% 27% 8% 2	249
March	1st to 10th	Day	3 14% 33% 30% 16% 4	300
	11th to 20th	Day	9% 15% 37% 25% 12% 3	411
	21st to end	Day	10% 20% 42% 18% 8% 2	550
April	1st to 10th	Day	9% 18% 38% 23% 9% 2	500
	11th to 20th	Day	12% 22% 37% 19% 6% 3	492
	21st to end	Day	14% 16% 35% 25% 8% 2	500
May	1st to 10th	Day	14% 15% 32% 24% 13% 3	658
	11th to 20th	Day	12% 9% 31% 27% 17% 4	676
	21st to end	Day	9% 11% 32% 25% 18% 6%	734
June	1st to 10th	Day	7% 7% 23% 32% 24% 7%	680
	11th to 20th	Day	5% 8% 30% 30% 22% 5%	680
	21st to end	Day	5% 5% 24% 35% 23% 7%	680
July	1st to 10th	Day	5% 3 17% 31% 33% 10%	671
	11th to 20th	Day	3 1 13% 35% 36% 11%	668
	21st to end	Day	7% 2 14% 28% 36% 14%	723
August	1st to 10th	Day	7% 1 18% 36% 29% 9%	487
	11th to 20th	Day	4 4 20% 36% 26% 10%	477
	21st to end	Day	3 3 21% 38% 26% 9%	539
September	1st to 10th	Day	6% 2 25% 34% 24% 10%	490
	11th to 20th	Day	3 4 27% 33% 22% 11%	428
	21st to end	Day	7% 8% 20% 28% 24% 14%	300
October	1st to 10th	Day	9% 7% 21% 27% 22% 15%	300
	11th to 20th	Day	3 10% 29% 30% 19% 9%	300
	21st to end	Day	10% 10% 28% 28% 18% 7%	330
November	1st to 10th	Day	6% 8% 33% 28% 20% 5%	300
	11th to 20th	Day	6% 7% 33% 33% 19% 2	300
	21st to end	Day	4 13% 32% 32% 13% 6%	300
December	1st to 10th	Day	3 12% 34% 33% 14% 3	300
	11th to 20th	Day	4 12% 34% 31% 18% 1	300
	21st to end	Day	5% 13% 37% 34% 9% 1	330
January	1st to 10th	Night	5% 6% 35% 40% 11% 3	1000
	11th to 20th	Night	4 8% 39% 37% 10% 2	990
	21st to end	Night	3 6% 38% 41% 11% 1	880
February	1st to 10th	Night	4 7% 47% 34% 7% 1	800
	11th to 20th	Night	5% 8% 47% 32% 8% 1	784
	21st to end	Night	5% 8% 48% 32% 7%	660
March	1st to 10th	Night	4 8% 40% 37% 9% 1	800
	11th to 20th	Night	9% 7% 36% 36% 11% 1	800
	21st to end	Night	7% 9% 41% 34% 8%	690
April	1st to 10th	Night	8% 11% 44% 29% 7%	600
	11th to 20th	Night	12% 13% 33% 34% 7% 1	593
	21st to end	Night	12% 13% 29% 36% 8% 1	600
May	1st to 10th	Night	11% 11% 33% 34% 12% 1	600
	11th to 20th	Night	11% 8% 27% 40% 13% 2	563
	21st to end	Night	9% 7% 37% 33% 14% 1	617
June	1st to 10th	Night	5% 5% 28% 42% 18% 2	570
	11th to 20th	Night	4 5% 32% 45% 14% 1	570
	21st to end	Night	6% 4 22% 46% 21% 2	570
July	1st to 10th	Night	7% 3 16% 44% 28% 2	555
	11th to 20th	Night	5% 1 10% 49% 33% 3	552
	21st to end	Night	7% 3 11% 40% 36% 3	624
August	1st to 10th	Night	7% 3 11% 44% 32% 3	567
	11th to 20th	Night	5% 3 14% 51% 24% 2	564
	21st to end	Night	6% 1 13% 46% 31% 3	627
September	1st to 10th	Night	6% 2 16% 49% 23% 4	570
	11th to 20th	Night	6% 2 19% 46% 24% 3	570
	21st to end	Night	6% 4 21% 44% 21% 3	570
October	1st to 10th	Night	9% 7% 29% 33% 18% 4	670
	11th to 20th	Night	4 6% 31% 38% 18% 3	760
	21st to end	Night	7% 8% 27% 37% 17% 3	917
November	1st to 10th	Night	5% 5% 30% 42% 17% 2	975
	11th to 20th	Night	3 7% 36% 41% 13% 2	1000
	21st to end	Night	6% 8% 33% 37% 14% 2	1000
December	1st to 10th	Night	3 6% 39% 39% 12% 2	1000
	11th to 20th	Night	4 7% 40% 37% 11% 2	1000
	21st to end	Night	6% 9% 39% 36% 9% 1	1100

Page generated at 2025-05-08 07:34:01. Version ac07

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