Wapinita Airstrip
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wapinita Airstrip clear sky chart from 2005-11-06 to 2024-11-05.

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	6% 6% 2 6% 4 4 4 4 6% 7% 51%	105387
	Night	6% 8% 3 7% 5% 4 5% 4 6% 7% 47%	102328
Transparency	Day	32% 7% 12% 23% 17% 9%	105130
	Night	35% 8% 15% 22% 14% 6%	102174
Seeing	Day	9% 15% 26% 28% 17% 5%	14580
	Night	9% 8% 23% 38% 20% 3	23579

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	11% 15% 6% 12% 6% 7% 6% 5% 7% 8% 17%	2539
	11th to 20th	Day	14% 18% 5% 10% 7% 7% 6% 4 4 5% 21%	2540
	21st to end	Day	12% 14% 4 13% 8% 7% 7% 5% 6% 7% 16%	2931
February	1st to 10th	Day	9% 12% 5% 9% 7% 4 6% 4 7% 9% 28%	1710
	11th to 20th	Day	9% 8% 3 8% 6% 6% 6% 5% 7% 9% 34%	1665
	21st to end	Day	7% 10% 4 9% 6% 5% 6% 6% 7% 9% 30%	1560
March	1st to 10th	Day	5% 10% 3 8% 6% 5% 6% 6% 9% 10% 33%	3157
	11th to 20th	Day	3 7% 3 7% 5% 5% 4 4 6% 7% 48%	3490
	21st to end	Day	6% 9% 4 11% 8% 7% 7% 5% 7% 8% 28%	4004
April	1st to 10th	Day	8% 12% 3 8% 6% 6% 6% 4 7% 7% 33%	2280
	11th to 20th	Day	6% 9% 3 7% 7% 4 5% 5% 5% 7% 42%	2249
	21st to end	Day	5% 6% 2 7% 5% 4 6% 4 7% 9% 44%	2390
May	1st to 10th	Day	9% 6% 2 7% 5% 4 5% 3 5% 5% 49%	4420
	11th to 20th	Day	4 3 1 4 3 3 3 2 4 7% 64%	4377
	21st to end	Day	8% 6% 2 5% 4 5% 5% 4 7% 9% 46%	4813
June	1st to 10th	Day	7% 6% 3 6% 5% 4 5% 4 6% 8% 45%	2660
	11th to 20th	Day	5% 4 2 6% 4 4 4 4 5% 7% 55%	2660
	21st to end	Day	3 2 1 3 3 3 3 3 4 6% 69%	2660
July	1st to 10th	Day	1 1 1 1 1 1 1 3 4 86%	4420
	11th to 20th	Day	2 1 2 1 1 2 2 3 3 84%	4420
	21st to end	Day	1 1 1 1 1 1 1 3 4 83%	4790
August	1st to 10th	Day	2 2 1 3 2 2 2 3 4 6% 75%	4263
	11th to 20th	Day	1 2 1 2 2 3 3 3 5% 6% 72%	4026
	21st to end	Day	2 3 1 3 3 3 3 2 4 5% 71%	4185
September	1st to 10th	Day	2 1 1 2 1 3 3 2 3 5% 78%	2280
	11th to 20th	Day	3 4 2 4 4 3 5% 4 5% 6% 60%	2280
	21st to end	Day	6% 4 2 4 3 4 4 3 4 7% 59%	2033
October	1st to 10th	Day	4 4 2 4 2 2 4 3 6% 6% 62%	3180
	11th to 20th	Day	4 3 1 6% 5% 5% 6% 5% 8% 10% 48%	3161
	21st to end	Day	7% 6% 3 6% 5% 6% 7% 5% 7% 9% 39%	3261
November	1st to 10th	Day	8% 10% 4 9% 6% 6% 6% 5% 7% 8% 31%	1701
	11th to 20th	Day	8% 11% 4 12% 8% 7% 6% 5% 8% 7% 24%	1520
	21st to end	Day	6% 12% 3 9% 7% 7% 6% 6% 7% 7% 30%	1520
December	1st to 10th	Day	8% 12% 4 11% 6% 6% 5% 5% 6% 6% 29%	1520
	11th to 20th	Day	8% 14% 5% 12% 8% 7% 7% 5% 7% 8% 18%	1928
	21st to end	Day	11% 15% 5% 13% 7% 8% 6% 4 6% 7% 18%	2794
January	1st to 10th	Night	9% 16% 7% 12% 8% 7% 6% 5% 6% 7% 16%	4406
	11th to 20th	Night	17% 17% 5% 9% 6% 5% 4 4 6% 7% 21%	4420
	21st to end	Night	14% 14% 6% 12% 7% 6% 6% 5% 6% 6% 18%	4724
February	1st to 10th	Night	8% 14% 4 9% 5% 5% 4 4 7% 7% 32%	2470
	11th to 20th	Night	7% 11% 3 6% 5% 6% 6% 5% 5% 7% 39%	2402
	21st to end	Night	7% 11% 4 8% 6% 6% 5% 5% 7% 9% 31%	1892
March	1st to 10th	Night	5% 7% 3 8% 7% 6% 7% 5% 8% 10% 35%	3715
	11th to 20th	Night	4 6% 2 6% 4 4 5% 4 6% 7% 53%	3490
	21st to end	Night	6% 8% 3 9% 8% 7% 7% 5% 8% 11% 29%	3648
April	1st to 10th	Night	8% 8% 3 8% 5% 5% 5% 5% 6% 8% 39%	1900
	11th to 20th	Night	6% 6% 2 7% 5% 6% 5% 5% 6% 7% 44%	1879
	21st to end	Night	7% 7% 2 5% 5% 4 4 4 6% 8% 48%	1786
May	1st to 10th	Night	10% 6% 2 5% 4 3 3 3 5% 6% 54%	2540
	11th to 20th	Night	3 3 2 3 3 3 3 3 4 6% 67%	2516
	21st to end	Night	4 5% 1 4 4 4 4 4 6% 9% 56%	2762
June	1st to 10th	Night	9% 6% 3 5% 4 3 4 4 6% 7% 50%	1520
	11th to 20th	Night	5% 4 1 4 4 3 4 3 5% 7% 61%	1520
	21st to end	Night	3 3 1 4 3 2 3 3 5% 5% 70%	1520
July	1st to 10th	Night	1 1 1 1 1 1 1 2 3 88%	2540
	11th to 20th	Night	1 1 2 2 1 2 1 3 3 83%	2540
	21st to end	Night	1 1 1 1 1 2 1 2 3 87%	2761
August	1st to 10th	Night	1 1 1 2 2 2 3 2 5% 6% 75%	2655
	11th to 20th	Night	1 1 1 2 2 2 3 3 4 5% 77%	2812
	21st to end	Night	1 1 1 3 2 2 3 2 3 5% 77%	3493
September	1st to 10th	Night	2 1 1 2 2 2 2 2 3 5% 80%	1900
	11th to 20th	Night	4 2 1 3 3 3 4 3 5% 6% 65%	1900
	21st to end	Night	4 3 1 3 3 3 3 3 6% 7% 63%	2144
October	1st to 10th	Night	3 3 1 3 3 3 3 2 4 6% 70%	3800
	11th to 20th	Night	4 4 1 4 4 5% 5% 4 7% 10% 51%	3777
	21st to end	Night	8% 5% 2 6% 5% 5% 6% 5% 8% 8% 41%	4301
November	1st to 10th	Night	9% 8% 3 7% 7% 5% 5% 4 7% 8% 36%	2477
	11th to 20th	Night	8% 11% 4 10% 6% 5% 6% 4 8% 8% 29%	2660
	21st to end	Night	6% 10% 3 8% 5% 5% 5% 5% 7% 8% 37%	2660
December	1st to 10th	Night	9% 13% 5% 9% 7% 6% 5% 4 6% 8% 27%	2660
	11th to 20th	Night	9% 16% 5% 11% 8% 8% 7% 4 7% 7% 18%	3276
	21st to end	Night	10% 13% 7% 13% 8% 6% 6% 4 5% 7% 22%	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	60% 12% 13% 12% 3	2539
	11th to 20th	Day	64% 9% 14% 10% 3 1	2540
	21st to end	Day	61% 11% 12% 11% 4	2931
February	1st to 10th	Day	51% 10% 17% 17% 4 1	1710
	11th to 20th	Day	45% 11% 16% 20% 7%	1674
	21st to end	Day	48% 10% 17% 17% 8% 1	1560
March	1st to 10th	Day	40% 11% 12% 25% 11%	3157
	11th to 20th	Day	34% 8% 14% 33% 12%	3490
	21st to end	Day	49% 12% 14% 18% 6%	4004
April	1st to 10th	Day	49% 9% 16% 17% 9%	2280
	11th to 20th	Day	43% 8% 17% 17% 13% 3	2252
	21st to end	Day	34% 11% 16% 26% 11% 2	2390
May	1st to 10th	Day	34% 8% 11% 27% 20%	4420
	11th to 20th	Day	21% 5% 9% 34% 27% 3	4380
	21st to end	Day	34% 9% 21% 28% 8%	4814
June	1st to 10th	Day	37% 6% 13% 27% 14% 2	2660
	11th to 20th	Day	29% 6% 14% 35% 14% 3	2660
	21st to end	Day	18% 5% 12% 33% 24% 9%	2660
July	1st to 10th	Day	6% 2 6% 14% 25% 47%	4351
	11th to 20th	Day	8% 3 5% 9% 25% 51%	4345
	21st to end	Day	8% 2 6% 20% 36% 29%	4639
August	1st to 10th	Day	13% 3 5% 19% 35% 26%	4247
	11th to 20th	Day	13% 4 9% 35% 30% 9%	4065
	21st to end	Day	16% 4 9% 28% 31% 11%	4184
September	1st to 10th	Day	12% 3 8% 30% 31% 16%	2280
	11th to 20th	Day	24% 6% 11% 28% 23% 8%	2280
	21st to end	Day	27% 6% 14% 26% 20% 6%	2033
October	1st to 10th	Day	22% 7% 9% 31% 25% 7%	3180
	11th to 20th	Day	29% 9% 19% 25% 17% 1	3161
	21st to end	Day	38% 8% 14% 27% 12% 1	3261
November	1st to 10th	Day	49% 10% 14% 19% 8% 1	1701
	11th to 20th	Day	55% 11% 16% 14% 4	1520
	21st to end	Day	50% 9% 16% 17% 8% 1	1520
December	1st to 10th	Day	53% 10% 12% 18% 7%	1520
	11th to 20th	Day	59% 12% 16% 11% 2	1928
	21st to end	Day	62% 9% 14% 12% 2	2794
January	1st to 10th	Night	63% 11% 13% 10% 3	4406
	11th to 20th	Night	61% 9% 16% 10% 4 1	4420
	21st to end	Night	60% 12% 13% 11% 4	4724
February	1st to 10th	Night	50% 9% 18% 18% 5%	2470
	11th to 20th	Night	42% 11% 19% 20% 8%	2404
	21st to end	Night	46% 11% 15% 19% 9% 1	1892
March	1st to 10th	Night	39% 10% 13% 26% 11% 1	3715
	11th to 20th	Night	29% 9% 16% 34% 11%	3490
	21st to end	Night	45% 14% 20% 18% 4	3648
April	1st to 10th	Night	40% 12% 20% 20% 8% 1	1900
	11th to 20th	Night	38% 10% 18% 21% 11% 3	1879
	21st to end	Night	34% 11% 16% 26% 11% 2	1786
May	1st to 10th	Night	30% 7% 11% 32% 19% 1	2540
	11th to 20th	Night	18% 7% 10% 40% 23% 2	2516
	21st to end	Night	23% 11% 33% 26% 7%	2762
June	1st to 10th	Night	35% 8% 13% 30% 12% 2	1520
	11th to 20th	Night	23% 8% 14% 38% 13% 3	1520
	21st to end	Night	19% 4 12% 34% 24% 8%	1520
July	1st to 10th	Night	6% 2 6% 15% 28% 43%	2500
	11th to 20th	Night	9% 2 5% 13% 22% 49%	2492
	21st to end	Night	6% 1 5% 20% 39% 28%	2674
August	1st to 10th	Night	12% 2 6% 17% 38% 25%	2647
	11th to 20th	Night	11% 3 11% 39% 27% 8%	2839
	21st to end	Night	12% 4 13% 30% 32% 10%	3493
September	1st to 10th	Night	10% 2 11% 29% 31% 16%	1900
	11th to 20th	Night	20% 6% 12% 29% 21% 11%	1900
	21st to end	Night	22% 6% 12% 30% 23% 8%	2144
October	1st to 10th	Night	18% 4 12% 35% 28% 3	3800
	11th to 20th	Night	27% 7% 23% 25% 16% 2	3777
	21st to end	Night	35% 9% 17% 26% 12% 1	4301
November	1st to 10th	Night	45% 11% 14% 21% 9% 1	2477
	11th to 20th	Night	50% 11% 16% 18% 5%	2660
	21st to end	Night	41% 10% 18% 22% 8% 1	2660
December	1st to 10th	Night	53% 9% 16% 17% 5%	2660
	11th to 20th	Night	60% 9% 15% 13% 3	3276
	21st to end	Night	56% 10% 16% 14% 5%	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	23% 14% 31% 18% 12% 3	180
	11th to 20th	Day	18% 15% 28% 28% 8% 3	180
	21st to end	Day	13% 17% 28% 28% 13% 2	283
February	1st to 10th	Day	18% 20% 27% 24% 9% 1	370
	11th to 20th	Day	14% 23% 29% 24% 9% 1	365
	21st to end	Day	15% 24% 26% 24% 9% 2	377
March	1st to 10th	Day	15% 21% 29% 27% 8% 1	460
	11th to 20th	Day	9% 21% 26% 31% 11% 2	460
	21st to end	Day	15% 22% 27% 27% 8% 1	506
April	1st to 10th	Day	17% 22% 26% 21% 12% 3	460
	11th to 20th	Day	13% 22% 31% 19% 10% 4	452
	21st to end	Day	6% 23% 32% 22% 14% 2	460
May	1st to 10th	Day	11% 17% 29% 24% 14% 4	463
	11th to 20th	Day	16% 14% 23% 27% 16% 5%	488
	21st to end	Day	13% 12% 23% 28% 19% 5%	529
June	1st to 10th	Day	9% 16% 24% 25% 20% 6%	490
	11th to 20th	Day	9% 23% 24% 27% 14% 4	490
	21st to end	Day	3 11% 27% 31% 21% 7%	490
July	1st to 10th	Day	1 6% 30% 35% 24% 5%	486
	11th to 20th	Day	2 10% 25% 31% 26% 6%	484
	21st to end	Day	2 4 24% 34% 25% 10%	531
August	1st to 10th	Day	2 6% 22% 33% 24% 13%	487
	11th to 20th	Day	1 6% 18% 31% 29% 14%	477
	21st to end	Day	3 9% 24% 30% 25% 9%	539
September	1st to 10th	Day	2 8% 21% 32% 29% 8%	490
	11th to 20th	Day	5% 9% 24% 31% 27% 4	490
	21st to end	Day	9% 9% 21% 33% 22% 5%	490
October	1st to 10th	Day	8% 12% 24% 30% 20% 5%	490
	11th to 20th	Day	9% 15% 21% 28% 22% 5%	490
	21st to end	Day	12% 19% 26% 25% 15% 4	427
November	1st to 10th	Day	14% 17% 26% 33% 10% 1	278
	11th to 20th	Day	12% 16% 29% 23% 17% 4	180
	21st to end	Day	14% 14% 27% 30% 13% 1	180
December	1st to 10th	Day	13% 16% 24% 27% 14% 7%	180
	11th to 20th	Day	18% 17% 34% 27% 4 1	180
	21st to end	Day	16% 18% 27% 25% 14% 1	198
January	1st to 10th	Night	16% 14% 23% 30% 15% 3	760
	11th to 20th	Night	15% 11% 23% 30% 18% 2	760
	21st to end	Night	14% 9% 21% 36% 18% 2	836
February	1st to 10th	Night	14% 11% 24% 34% 15% 1	760
	11th to 20th	Night	12% 12% 28% 33% 15% 1	744
	21st to end	Night	14% 13% 27% 35% 11%	628
March	1st to 10th	Night	9% 12% 27% 36% 15% 1	760
	11th to 20th	Night	8% 10% 24% 40% 16% 1	760
	21st to end	Night	8% 14% 28% 36% 13% 1	836
April	1st to 10th	Night	12% 10% 30% 30% 16% 2	760
	11th to 20th	Night	8% 12% 30% 30% 16% 3	751
	21st to end	Night	8% 9% 30% 34% 17% 2	646
May	1st to 10th	Night	5% 9% 29% 36% 19% 3	380
	11th to 20th	Night	7% 6% 21% 37% 27% 2	374
	21st to end	Night	5% 5% 18% 46% 24% 2	411
June	1st to 10th	Night	12% 6% 22% 40% 20% 1	380
	11th to 20th	Night	6% 9% 28% 41% 16% 1	380
	21st to end	Night	4 3 23% 47% 22% 1	380
July	1st to 10th	Night	2 1 17% 54% 26% 2	370
	11th to 20th	Night	1 1 18% 55% 22% 2	368
	21st to end	Night	1 1 15% 51% 29% 3	416
August	1st to 10th	Night	2 2 10% 46% 36% 5%	452
	11th to 20th	Night	2 1 9% 39% 41% 9%	564
	21st to end	Night	1 3 19% 43% 29% 4	831
September	1st to 10th	Night	1 3 15% 44% 33% 4	760
	11th to 20th	Night	4 2 14% 44% 30% 6%	760
	21st to end	Night	6% 5% 17% 40% 28% 5%	760
October	1st to 10th	Night	8% 4 20% 40% 25% 4	760
	11th to 20th	Night	5% 7% 21% 38% 24% 4	760
	21st to end	Night	11% 8% 24% 37% 17% 3	836
November	1st to 10th	Night	11% 9% 26% 40% 15% 1	760
	11th to 20th	Night	13% 13% 26% 31% 15% 1	760
	21st to end	Night	9% 9% 24% 37% 19% 3	760
December	1st to 10th	Night	14% 11% 22% 35% 16% 3	760
	11th to 20th	Night	14% 11% 24% 36% 14% 1	760
	21st to end	Night	15% 16% 27% 33% 9% 1	836

Page generated at 2024-11-02 23:11:08. Version ac07

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