Pinetop
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinetop clear sky chart from 2005-11-06 to 2024-11-28.

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 5% 2 5% 4 4 4 4 5% 6% 57%	105380
	Night	3 5% 2 5% 3 3 4 3 5% 6% 60%	102921
Transparency	Day	26% 6% 7% 15% 26% 19%	105146
	Night	23% 6% 8% 17% 28% 19%	102744
Seeing	Day	12% 19% 28% 24% 13% 4	14771
	Night	8% 12% 24% 30% 22% 5%	24882

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	2 9% 4 7% 4 3 3 4 4 5% 56%	2858
	11th to 20th	Day	3 7% 3 4 3 3 4 4 5% 6% 58%	2860
	21st to end	Day	4 12% 4 7% 4 4 4 3 4 6% 47%	3146
February	1st to 10th	Day	2 10% 4 5% 3 3 3 2 4 5% 59%	1710
	11th to 20th	Day	3 9% 3 5% 5% 4 3 3 5% 5% 56%	1758
	21st to end	Day	3 11% 2 6% 3 4 3 2 5% 7% 55%	1701
March	1st to 10th	Day	2 6% 2 6% 4 4 4 3 4 6% 58%	3444
	11th to 20th	Day	3 11% 4 7% 5% 4 4 4 4 6% 47%	3490
	21st to end	Day	3 11% 4 8% 3 3 3 3 4 4 54%	3825
April	1st to 10th	Day	2 3 1 5% 3 3 4 4 5% 7% 63%	2133
	11th to 20th	Day	2 4 1 4 3 3 3 3 4 4 69%	2251
	21st to end	Day	3 3 1 4 3 3 3 2 4 5% 66%	2280
May	1st to 10th	Day	1 2 1 2 2 2 2 1 3 4 80%	4100
	11th to 20th	Day	2 3 1 4 3 5% 5% 4 6% 6% 62%	4071
	21st to end	Day	2 2 1 1 1 2 2 2 2 4 82%	4477
June	1st to 10th	Day	1 2 1 2 3 3 4 3 5% 7% 69%	2470
	11th to 20th	Day	2 1 3 2 3 3 2 3 4 77%	2470
	21st to end	Day	2 4 1 6% 4 4 5% 4 5% 5% 60%	2470
July	1st to 10th	Day	3 4 1 5% 5% 5% 5% 4 6% 6% 56%	4110
	11th to 20th	Day	4 4 2 7% 7% 7% 8% 7% 9% 8% 37%	4110
	21st to end	Day	5% 5% 2 8% 7% 7% 9% 7% 9% 9% 31%	4454
August	1st to 10th	Day	5% 5% 2 9% 8% 7% 9% 6% 7% 7% 35%	4092
	11th to 20th	Day	5% 3 2 8% 6% 8% 8% 6% 8% 8% 39%	3976
	21st to end	Day	5% 4 1 7% 7% 7% 7% 5% 7% 8% 42%	4180
September	1st to 10th	Day	6% 5% 3 7% 5% 6% 6% 5% 6% 6% 44%	2204
	11th to 20th	Day	4 3 1 5% 4 4 4 4 5% 6% 60%	2090
	21st to end	Day	4 3 1 4 3 4 4 4 4 5% 63%	2090
October	1st to 10th	Day	5% 4 2 5% 3 3 3 2 3 5% 65%	3235
	11th to 20th	Day	4 3 1 3 3 2 2 2 4 5% 70%	3150
	21st to end	Day	2 2 1 2 2 1 2 2 4 6% 77%	3438
November	1st to 10th	Day	2 3 1 3 2 2 3 3 4 5% 71%	1959
	11th to 20th	Day	2 3 1 4 3 3 3 3 4 5% 69%	1980
	21st to end	Day	3 6% 2 6% 3 2 3 2 4 5% 61%	1773
December	1st to 10th	Day	5% 6% 2 5% 4 4 3 4 5% 5% 59%	1710
	11th to 20th	Day	3 12% 4 8% 4 4 3 3 5% 5% 49%	2169
	21st to end	Day	3 10% 3 8% 4 4 4 3 3 4 53%	3146
January	1st to 10th	Night	3 9% 4 8% 4 4 4 4 5% 6% 49%	4097
	11th to 20th	Night	2 5% 2 5% 3 3 3 2 4 5% 66%	4110
	21st to end	Night	5% 14% 5% 7% 4 4 3 3 4 5% 45%	4521
February	1st to 10th	Night	2 9% 3 5% 3 3 2 2 4 4 61%	2470
	11th to 20th	Night	3 8% 2 6% 5% 4 4 4 4 5% 57%	2305
	21st to end	Night	4 7% 3 5% 3 3 3 3 5% 7% 56%	1751
March	1st to 10th	Night	2 6% 2 4 3 2 2 2 4 6% 66%	3430
	11th to 20th	Night	4 8% 2 6% 4 3 4 3 5% 6% 54%	3490
	21st to end	Night	3 9% 3 6% 4 3 4 3 5% 7% 53%	3828
April	1st to 10th	Night	2 5% 1 3 4 3 3 3 5% 7% 65%	2047
	11th to 20th	Night	1 5% 1 4 2 2 2 2 4 6% 70%	1877
	21st to end	Night	2 2 1 3 2 2 2 2 4 7% 73%	1900
May	1st to 10th	Night	1 1 1 2 2 1 2 2 4 4 80%	2866
	11th to 20th	Night	2 2 1 4 3 3 2 3 5% 5% 71%	2834
	21st to end	Night	1 1 1 1 1 1 1 2 3 88%	3110
June	1st to 10th	Night	1 2 1 4 2 3 3 3 5% 7% 68%	1710
	11th to 20th	Night	2 2 1 1 1 2 2 2 3 5% 80%	1710
	21st to end	Night	3 3 1 4 4 3 5% 3 5% 6% 63%	1710
July	1st to 10th	Night	2 2 1 4 4 4 5% 4 7% 7% 60%	2860
	11th to 20th	Night	3 5% 2 9% 8% 8% 8% 7% 10% 10% 29%	2860
	21st to end	Night	4 5% 3 8% 7% 7% 8% 6% 9% 13% 31%	3109
August	1st to 10th	Night	3 3 1 7% 6% 7% 8% 7% 9% 11% 38%	2847
	11th to 20th	Night	3 4 2 5% 4 5% 6% 6% 10% 12% 42%	2860
	21st to end	Night	3 3 2 6% 5% 6% 7% 7% 10% 10% 42%	3487
September	1st to 10th	Night	4 4 2 6% 4 4 5% 4 7% 9% 50%	1971
	11th to 20th	Night	3 3 1 4 2 3 3 3 4 5% 67%	2090
	21st to end	Night	3 2 1 4 3 2 4 2 4 5% 70%	2090
October	1st to 10th	Night	2 2 1 3 2 3 3 2 4 5% 72%	3734
	11th to 20th	Night	2 2 1 2 2 2 2 2 4 5% 77%	3778
	21st to end	Night	2 2 1 2 2 2 3 2 3 4 76%	4120
November	1st to 10th	Night	3 3 1 3 3 2 3 2 5% 5% 69%	2340
	11th to 20th	Night	2 3 1 4 2 2 2 2 4 5% 73%	2416
	21st to end	Night	2 6% 2 4 3 3 3 3 5% 6% 62%	2561
December	1st to 10th	Night	5% 7% 2 4 2 2 3 3 4 6% 62%	2470
	11th to 20th	Night	5% 9% 3 6% 3 3 4 4 6% 7% 49%	3041
	21st to end	Night	4 9% 3 6% 4 4 4 3 4 5% 54%	4521

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	30% 4 6% 21% 26% 14%	2859
	11th to 20th	Day	28% 5% 6% 24% 24% 13%	2860
	21st to end	Day	36% 5% 7% 15% 29% 9%	3146
February	1st to 10th	Day	30% 3 5% 15% 24% 22%	1710
	11th to 20th	Day	31% 4 5% 18% 22% 20%	1767
	21st to end	Day	30% 5% 5% 15% 27% 18%	1701
March	1st to 10th	Day	24% 6% 6% 17% 34% 13%	3444
	11th to 20th	Day	34% 8% 7% 17% 25% 9%	3490
	21st to end	Day	33% 4 6% 22% 29% 6%	3825
April	1st to 10th	Day	19% 4 6% 19% 37% 16%	2133
	11th to 20th	Day	19% 4 3 14% 35% 24%	2254
	21st to end	Day	20% 4 5% 16% 39% 15%	2280
May	1st to 10th	Day	11% 2 3 13% 49% 22%	4100
	11th to 20th	Day	19% 7% 7% 11% 37% 20%	4074
	21st to end	Day	9% 3 3 8% 27% 51%	4477
June	1st to 10th	Day	14% 5% 5% 13% 34% 28%	2470
	11th to 20th	Day	11% 3 4 8% 28% 47%	2470
	21st to end	Day	24% 7% 7% 11% 26% 25%	2470
July	1st to 10th	Day	26% 8% 8% 8% 12% 39%	4046
	11th to 20th	Day	36% 13% 13% 23% 9% 5%	4041
	21st to end	Day	40% 14% 19% 18% 7% 1	4314
August	1st to 10th	Day	40% 12% 19% 14% 10% 5%	4078
	11th to 20th	Day	36% 11% 12% 19% 18% 5%	4015
	21st to end	Day	35% 11% 13% 17% 18% 5%	4179
September	1st to 10th	Day	36% 8% 9% 15% 19% 14%	2204
	11th to 20th	Day	25% 6% 7% 15% 32% 16%	2090
	21st to end	Day	22% 5% 6% 14% 32% 20%	2090
October	1st to 10th	Day	23% 5% 4 13% 23% 33%	3235
	11th to 20th	Day	18% 3 2 13% 45% 20%	3150
	21st to end	Day	10% 2 3 11% 38% 35%	3438
November	1st to 10th	Day	15% 4 4 24% 33% 21%	1959
	11th to 20th	Day	17% 4 5% 15% 33% 26%	1980
	21st to end	Day	26% 3 5% 15% 31% 20%	1773
December	1st to 10th	Day	29% 4 5% 17% 24% 20%	1710
	11th to 20th	Day	37% 5% 8% 16% 21% 14%	2168
	21st to end	Day	34% 4 6% 14% 24% 18%	3146
January	1st to 10th	Night	33% 6% 7% 14% 26% 13%	4097
	11th to 20th	Night	22% 5% 6% 23% 32% 12%	4110
	21st to end	Night	40% 5% 5% 13% 28% 10%	4521
February	1st to 10th	Night	27% 4 6% 17% 23% 23%	2470
	11th to 20th	Night	30% 5% 5% 17% 24% 19%	2306
	21st to end	Night	28% 4 6% 13% 28% 20%	1751
March	1st to 10th	Night	18% 5% 5% 20% 39% 13%	3430
	11th to 20th	Night	25% 7% 8% 21% 28% 10%	3490
	21st to end	Night	27% 9% 6% 27% 24% 7%	3828
April	1st to 10th	Night	19% 4 4 23% 33% 15%	2047
	11th to 20th	Night	17% 3 3 17% 38% 22%	1877
	21st to end	Night	13% 4 5% 23% 40% 15%	1900
May	1st to 10th	Night	8% 4 5% 15% 52% 17%	2866
	11th to 20th	Night	13% 5% 6% 17% 40% 20%	2835
	21st to end	Night	6% 2 3 9% 34% 47%	3110
June	1st to 10th	Night	15% 3 5% 13% 32% 33%	1710
	11th to 20th	Night	9% 3 3 10% 30% 46%	1710
	21st to end	Night	21% 4 10% 13% 25% 27%	1710
July	1st to 10th	Night	21% 6% 10% 13% 12% 38%	2815
	11th to 20th	Night	39% 12% 18% 18% 6% 7%	2806
	21st to end	Night	38% 13% 27% 14% 7% 1	3011
August	1st to 10th	Night	34% 13% 24% 13% 10% 6%	2838
	11th to 20th	Night	28% 10% 19% 22% 17% 4	2887
	21st to end	Night	30% 9% 15% 20% 20% 5%	3487
September	1st to 10th	Night	28% 8% 15% 19% 20% 11%	1971
	11th to 20th	Night	19% 5% 8% 18% 36% 15%	2090
	21st to end	Night	17% 4 6% 18% 33% 22%	2090
October	1st to 10th	Night	15% 4 5% 13% 31% 33%	3734
	11th to 20th	Night	11% 2 3 15% 43% 26%	3778
	21st to end	Night	12% 3 3 12% 36% 33%	4120
November	1st to 10th	Night	18% 3 4 21% 33% 22%	2340
	11th to 20th	Night	15% 4 5% 20% 29% 28%	2416
	21st to end	Night	23% 4 5% 16% 28% 23%	2561
December	1st to 10th	Night	25% 3 6% 19% 25% 21%	2470
	11th to 20th	Night	34% 5% 8% 15% 23% 15%	3041
	21st to end	Night	32% 4 7% 13% 21% 23%	4521

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% 25% 30% 19% 9% 1	270
	11th to 20th	Day	17% 22% 25% 23% 11% 2	270
	21st to end	Day	13% 24% 30% 18% 13% 2	297
February	1st to 10th	Day	16% 26% 27% 20% 9% 2	270
	11th to 20th	Day	23% 29% 26% 17% 4	363
	21st to end	Day	24% 33% 24% 15% 3 1	382
March	1st to 10th	Day	21% 33% 26% 15% 4 1	460
	11th to 20th	Day	19% 28% 28% 15% 9% 1	460
	21st to end	Day	22% 33% 29% 12% 4	506
April	1st to 10th	Day	11% 34% 33% 15% 5% 2	460
	11th to 20th	Day	18% 29% 35% 13% 4 1	452
	21st to end	Day	16% 26% 37% 15% 5% 1	460
May	1st to 10th	Day	10% 27% 38% 20% 4 1	463
	11th to 20th	Day	7% 22% 40% 21% 7% 3	488
	21st to end	Day	9% 27% 39% 18% 6% 1	529
June	1st to 10th	Day	4 17% 38% 31% 8% 2	490
	11th to 20th	Day	6% 17% 38% 24% 11% 3	490
	21st to end	Day	6% 11% 35% 31% 13% 4	490
July	1st to 10th	Day	5% 3 27% 36% 22% 7%	486
	11th to 20th	Day	9% 3 12% 33% 32% 11%	484
	21st to end	Day	8% 4 11% 33% 33% 11%	531
August	1st to 10th	Day	10% 2 13% 36% 29% 9%	487
	11th to 20th	Day	7% 6% 14% 37% 27% 9%	477
	21st to end	Day	7% 3 15% 37% 25% 12%	539
September	1st to 10th	Day	7% 7% 22% 35% 22% 7%	490
	11th to 20th	Day	6% 11% 34% 30% 15% 4	490
	21st to end	Day	8% 16% 28% 27% 17% 5%	490
October	1st to 10th	Day	9% 17% 27% 24% 17% 5%	339
	11th to 20th	Day	11% 17% 26% 29% 12% 5%	300
	21st to end	Day	11% 18% 28% 24% 15% 3	330
November	1st to 10th	Day	10% 22% 31% 24% 12% 1	300
	11th to 20th	Day	9% 17% 29% 27% 15% 3	300
	21st to end	Day	19% 21% 29% 19% 11% 2	291
December	1st to 10th	Day	15% 21% 27% 27% 8% 2	270
	11th to 20th	Day	10% 31% 27% 21% 9% 2	270
	21st to end	Day	23% 22% 26% 21% 7% 1	297
January	1st to 10th	Night	11% 15% 26% 29% 14% 6%	760
	11th to 20th	Night	11% 15% 31% 26% 13% 3	760
	21st to end	Night	12% 19% 27% 25% 14% 3	836
February	1st to 10th	Night	10% 21% 27% 26% 13% 3	760
	11th to 20th	Night	10% 21% 33% 26% 8% 1	744
	21st to end	Night	14% 20% 34% 22% 8% 2	628
March	1st to 10th	Night	13% 20% 33% 23% 10% 1	760
	11th to 20th	Night	11% 14% 29% 27% 15% 4	760
	21st to end	Night	10% 18% 30% 28% 13% 2	836
April	1st to 10th	Night	6% 18% 34% 29% 11% 2	717
	11th to 20th	Night	9% 21% 29% 32% 7% 1	563
	21st to end	Night	5% 18% 29% 29% 16% 3	570
May	1st to 10th	Night	4 15% 28% 36% 15% 2	570
	11th to 20th	Night	3 10% 29% 37% 18% 2	561
	21st to end	Night	5% 13% 28% 35% 17% 1	617
June	1st to 10th	Night	3 6% 23% 43% 22% 3	570
	11th to 20th	Night	4 6% 29% 39% 22% 1	570
	21st to end	Night	4 4 15% 37% 36% 5%	570
July	1st to 10th	Night	5% 1 8% 35% 45% 6%	555
	11th to 20th	Night	5% 1 5% 25% 49% 14%	552
	21st to end	Night	8% 1 4 22% 51% 13%	624
August	1st to 10th	Night	5% 1 5% 19% 54% 15%	567
	11th to 20th	Night	5% 2 6% 23% 53% 12%	564
	21st to end	Night	4 1 6% 26% 49% 14%	627
September	1st to 10th	Night	6% 1 12% 33% 40% 8%	641
	11th to 20th	Night	5% 2 19% 35% 33% 6%	760
	21st to end	Night	4 9% 15% 35% 29% 8%	760
October	1st to 10th	Night	5% 12% 24% 36% 20% 3	760
	11th to 20th	Night	4 9% 25% 39% 19% 4	760
	21st to end	Night	5% 13% 24% 28% 22% 7%	836
November	1st to 10th	Night	6% 13% 25% 34% 16% 6%	780
	11th to 20th	Night	4 14% 30% 30% 18% 5%	800
	21st to end	Night	10% 18% 26% 27% 15% 5%	788
December	1st to 10th	Night	13% 15% 22% 29% 18% 2	760
	11th to 20th	Night	12% 17% 30% 27% 12% 2	760
	21st to end	Night	13% 18% 30% 26% 10% 3	836

Page generated at 2024-11-24 22:22:14. Version ac07

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