Webequie Indian Reserve
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Webequie Indian Reserve clear sky chart from 2005-11-06 to 2026-07-01.

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	13% 11% 4 10% 6% 6% 6% 4 6% 6% 28%	138520
	Night	11% 12% 5% 12% 7% 7% 7% 5% 6% 6% 22%	134155
Transparency	Day	56% 3 10% 22% 9% 1	141831
	Night	62% 3 9% 18% 7%	138931
Seeing	Day	19% 5% 24% 29% 17% 6%	17924
	Night	19% 6% 25% 33% 15% 2	27140

By Month

Percentage Cloud Cover NE (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	4 15% 7% 20% 11% 10% 7% 5% 7% 5% 8%	3527
	11th to 20th	Day	4 11% 6% 21% 11% 11% 11% 7% 8% 4 6%	4140
	21st to end	Day	8% 10% 5% 14% 9% 9% 12% 7% 10% 6% 11%	5156
February	1st to 10th	Day	4 13% 5% 11% 9% 9% 11% 9% 9% 8% 14%	1680
	11th to 20th	Day	5% 12% 4 11% 9% 8% 7% 8% 9% 8% 19%	1728
	21st to end	Day	3 10% 5% 11% 8% 8% 9% 7% 11% 9% 21%	1730
March	1st to 10th	Day	4 11% 6% 14% 10% 7% 7% 6% 7% 6% 20%	4578
	11th to 20th	Day	8% 13% 5% 12% 9% 9% 7% 5% 5% 6% 20%	4750
	21st to end	Day	7% 13% 4 11% 8% 9% 10% 6% 6% 6% 19%	6096
April	1st to 10th	Day	9% 11% 5% 11% 7% 7% 6% 5% 6% 6% 27%	2520
	11th to 20th	Day	13% 13% 4 10% 7% 5% 4 3 5% 7% 30%	2660
	21st to end	Day	13% 11% 4 8% 6% 6% 5% 3 6% 7% 33%	2856
May	1st to 10th	Day	13% 14% 5% 10% 5% 4 4 3 4 6% 32%	8241
	11th to 20th	Day	22% 10% 4 7% 4 4 4 3 4 6% 32%	8717
	21st to end	Day	14% 8% 3 7% 4 4 5% 3 5% 6% 40%	9716
June	1st to 10th	Day	19% 9% 3 6% 5% 4 5% 4 6% 7% 32%	3324
	11th to 20th	Day	16% 7% 2 7% 6% 6% 5% 4 6% 7% 35%	3360
	21st to end	Day	15% 7% 2 6% 5% 5% 5% 5% 6% 8% 36%	3360
July	1st to 10th	Day	10% 5% 2 6% 4 5% 5% 4 7% 8% 45%	7260
	11th to 20th	Day	18% 7% 2 7% 5% 4 5% 4 6% 8% 35%	7138
	21st to end	Day	10% 6% 2 6% 4 4 5% 4 7% 10% 42%	7091
August	1st to 10th	Day	18% 5% 2 6% 4 5% 5% 4 6% 7% 37%	4563
	11th to 20th	Day	13% 5% 2 6% 4 4 4 3 5% 7% 47%	4496
	21st to end	Day	14% 6% 3 6% 5% 4 4 3 7% 8% 40%	4633
September	1st to 10th	Day	23% 10% 2 8% 4 4 5% 4 5% 6% 29%	2400
	11th to 20th	Day	25% 9% 3 9% 4 4 5% 4 5% 6% 26%	2291
	21st to end	Day	20% 14% 4 6% 4 4 4 3 5% 6% 31%	2200
October	1st to 10th	Day	24% 16% 4 9% 4 5% 4 3 4 6% 20%	2065
	11th to 20th	Day	22% 22% 6% 10% 5% 5% 4 3 4 5% 15%	1800
	21st to end	Day	21% 23% 7% 13% 6% 4 4 3 4 4 13%	1980
November	1st to 10th	Day	18% 22% 9% 14% 7% 6% 4 3 4 3 12%	1701
	11th to 20th	Day	19% 21% 8% 15% 10% 6% 4 3 3 4 8%	1470
	21st to end	Day	16% 23% 6% 20% 10% 5% 4 3 3 3 7%	1470
December	1st to 10th	Day	5% 16% 9% 18% 10% 7% 8% 4 7% 4 12%	2350
	11th to 20th	Day	6% 15% 8% 16% 7% 7% 9% 5% 7% 6% 14%	2415
	21st to end	Day	12% 16% 7% 14% 8% 6% 6% 4 5% 6% 16%	3058
January	1st to 10th	Night	4 15% 7% 20% 10% 10% 9% 5% 6% 5% 10%	9398
	11th to 20th	Night	4 13% 8% 20% 9% 11% 10% 7% 8% 4 6%	8768
	21st to end	Night	5% 11% 6% 13% 9% 12% 12% 7% 8% 5% 13%	9058
February	1st to 10th	Night	4 10% 6% 14% 9% 9% 13% 8% 7% 5% 14%	2940
	11th to 20th	Night	5% 11% 6% 11% 8% 8% 9% 8% 9% 7% 18%	2776
	21st to end	Night	3 10% 5% 11% 7% 8% 9% 8% 8% 7% 23%	2076
March	1st to 10th	Night	5% 7% 3 11% 8% 10% 8% 6% 8% 7% 26%	5482
	11th to 20th	Night	11% 13% 5% 14% 10% 8% 5% 4 5% 6% 20%	5429
	21st to end	Night	8% 12% 5% 11% 6% 8% 8% 5% 6% 7% 23%	5119
April	1st to 10th	Night	10% 14% 4 9% 7% 6% 6% 4 5% 7% 29%	2100
	11th to 20th	Night	12% 12% 5% 9% 6% 6% 5% 5% 5% 6% 31%	1908
	21st to end	Night	12% 11% 3 8% 6% 5% 4 4 6% 6% 36%	1761
May	1st to 10th	Night	11% 12% 4 13% 6% 5% 4 3 4 4 34%	4688
	11th to 20th	Night	18% 11% 4 11% 5% 5% 4 3 5% 5% 29%	4161
	21st to end	Night	15% 7% 3 6% 4 4 4 4 5% 7% 40%	4492
June	1st to 10th	Night	19% 9% 3 6% 5% 4 5% 5% 5% 6% 34%	1292
	11th to 20th	Night	17% 5% 3 8% 5% 5% 4 4 6% 7% 36%	1260
	21st to end	Night	15% 7% 2 6% 5% 5% 4 4 6% 8% 38%	1260
July	1st to 10th	Night	10% 6% 2 6% 4 4 5% 5% 6% 8% 44%	2720
	11th to 20th	Night	15% 6% 2 6% 5% 5% 5% 4 6% 8% 38%	2842
	21st to end	Night	11% 5% 2 6% 4 5% 4 4 6% 9% 42%	3780
August	1st to 10th	Night	20% 6% 2 5% 4 4 5% 4 6% 8% 36%	2597
	11th to 20th	Night	12% 6% 1 4 3 3 3 3 6% 9% 50%	2563
	21st to end	Night	12% 8% 3 6% 4 5% 5% 4 7% 8% 38%	3264
September	1st to 10th	Night	16% 8% 3 7% 6% 5% 4 4 5% 6% 37%	2000
	11th to 20th	Night	20% 10% 4 7% 5% 4 5% 4 5% 7% 30%	2088
	21st to end	Night	21% 10% 3 6% 4 5% 5% 3 5% 7% 31%	2200
October	1st to 10th	Night	26% 16% 3 8% 5% 4 3 3 4 5% 22%	2332
	11th to 20th	Night	22% 19% 6% 10% 5% 5% 4 3 5% 5% 17%	2600
	21st to end	Night	19% 21% 7% 11% 6% 5% 4 3 4 5% 14%	2860
November	1st to 10th	Night	20% 21% 8% 13% 7% 6% 4 2 4 4 12%	2812
	11th to 20th	Night	18% 20% 7% 17% 9% 5% 4 2 4 4 9%	3150
	21st to end	Night	14% 24% 8% 17% 8% 6% 5% 3 2 3 9%	3150
December	1st to 10th	Night	6% 17% 8% 18% 11% 8% 8% 5% 6% 3 10%	5060
	11th to 20th	Night	9% 14% 6% 16% 9% 8% 6% 6% 6% 5% 14%	6007
	21st to end	Night	11% 16% 5% 14% 8% 7% 6% 5% 6% 5% 16%	8162

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	76% 2 6% 9% 6% 1	3528
	11th to 20th	Day	78% 2 7% 11% 2	4169
	21st to end	Day	68% 2 7% 17% 6%	5156
February	1st to 10th	Day	62% 5% 8% 17% 8%	1680
	11th to 20th	Day	58% 3 10% 21% 8%	1736
	21st to end	Day	52% 4 11% 19% 13%	1730
March	1st to 10th	Day	62% 2 6% 17% 11% 2	4580
	11th to 20th	Day	65% 2 7% 17% 8% 1	4750
	21st to end	Day	65% 2 5% 20% 8% 1	6096
April	1st to 10th	Day	57% 3 8% 19% 12%	2520
	11th to 20th	Day	56% 2 7% 24% 10% 1	2660
	21st to end	Day	52% 2 7% 23% 15% 1	2856
May	1st to 10th	Day	55% 2 8% 22% 11% 1	8250
	11th to 20th	Day	55% 3 8% 22% 12% 1	8721
	21st to end	Day	46% 3 8% 24% 17% 3	9717
June	1st to 10th	Day	51% 3 8% 23% 13% 1	3324
	11th to 20th	Day	48% 4 8% 24% 14% 1	3360
	21st to end	Day	45% 4 12% 25% 13% 1	3360
July	1st to 10th	Day	36% 4 15% 35% 10%	7182
	11th to 20th	Day	47% 5% 13% 29% 5%	7051
	21st to end	Day	37% 5% 19% 34% 4	6889
August	1st to 10th	Day	46% 4 15% 29% 6%	4548
	11th to 20th	Day	36% 3 12% 38% 11%	4538
	21st to end	Day	41% 5% 16% 28% 10%	4632
September	1st to 10th	Day	57% 3 15% 19% 7%	2400
	11th to 20th	Day	60% 4 13% 20% 3	2291
	21st to end	Day	56% 3 15% 18% 7%	2200
October	1st to 10th	Day	69% 4 11% 12% 5%	3351
	11th to 20th	Day	57% 6% 13% 20% 4	2912
	21st to end	Day	71% 4 10% 14% 2	3180
November	1st to 10th	Day	79% 3 8% 9% 1	1701
	11th to 20th	Day	83% 3 7% 6% 1	1470
	21st to end	Day	83% 4 5% 8% 1	1470
December	1st to 10th	Day	73% 3 8% 13% 3	2350
	11th to 20th	Day	69% 3 5% 16% 6%	2415
	21st to end	Day	70% 2 8% 14% 6%	3058
January	1st to 10th	Night	77% 2 7% 9% 4 1	9398
	11th to 20th	Night	78% 2 8% 10% 2	8814
	21st to end	Night	70% 2 6% 16% 6%	9058
February	1st to 10th	Night	67% 5% 8% 14% 5%	2940
	11th to 20th	Night	59% 4 10% 21% 6%	2778
	21st to end	Night	56% 4 10% 19% 11% 1	2076
March	1st to 10th	Night	54% 3 7% 19% 14% 2	5493
	11th to 20th	Night	65% 2 9% 14% 10%	5430
	21st to end	Night	60% 2 4 24% 9%	5119
April	1st to 10th	Night	55% 3 6% 22% 15%	2100
	11th to 20th	Night	55% 3 6% 23% 12% 1	1908
	21st to end	Night	48% 3 8% 23% 17% 1	1761
May	1st to 10th	Night	55% 2 6% 25% 12% 1	4695
	11th to 20th	Night	59% 2 6% 19% 13% 1	4162
	21st to end	Night	44% 3 7% 23% 20% 3	4493
June	1st to 10th	Night	51% 3 7% 24% 13% 1	1292
	11th to 20th	Night	46% 5% 9% 24% 15% 1	1260
	21st to end	Night	43% 3 10% 30% 13% 1	1260
July	1st to 10th	Night	37% 4 13% 36% 10%	2690
	11th to 20th	Night	43% 6% 15% 28% 8%	2806
	21st to end	Night	37% 5% 17% 35% 6%	3668
August	1st to 10th	Night	46% 5% 17% 26% 7%	2588
	11th to 20th	Night	31% 4 18% 41% 6%	2587
	21st to end	Night	43% 4 17% 22% 14%	3264
September	1st to 10th	Night	49% 3 17% 24% 7% 1	2000
	11th to 20th	Night	55% 4 16% 23% 2	2088
	21st to end	Night	53% 4 15% 19% 8%	2200
October	1st to 10th	Night	61% 3 12% 18% 5%	3826
	11th to 20th	Night	60% 4 12% 20% 4	4227
	21st to end	Night	73% 5% 7% 12% 4	4610
November	1st to 10th	Night	77% 3 8% 9% 2	2812
	11th to 20th	Night	80% 3 8% 7% 1	3150
	21st to end	Night	83% 2 6% 7% 2	3150
December	1st to 10th	Night	76% 4 8% 10% 2	5060
	11th to 20th	Night	69% 3 8% 16% 4	6006
	21st to end	Night	68% 2 7% 17% 4	8162

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	10% 2 35% 36% 15% 3	220
	11th to 20th	Day	9% 4 30% 30% 20% 7%	269
	21st to end	Day	14% 4 20% 33% 23% 6%	363
February	1st to 10th	Day	10% 5% 25% 37% 20% 3	330
	11th to 20th	Day	6% 4 32% 32% 17% 8%	330
	21st to end	Day	6% 6% 30% 36% 17% 4	273
March	1st to 10th	Day	11% 5% 24% 32% 18% 9%	330
	11th to 20th	Day	10% 5% 27% 37% 15% 5%	382
	21st to end	Day	14% 5% 25% 30% 19% 7%	594
April	1st to 10th	Day	12% 5% 26% 32% 19% 6%	540
	11th to 20th	Day	22% 5% 26% 25% 17% 5%	532
	21st to end	Day	19% 3 24% 28% 19% 7%	666
May	1st to 10th	Day	23% 5% 22% 26% 18% 6%	753
	11th to 20th	Day	22% 5% 26% 28% 15% 5%	775
	21st to end	Day	21% 7% 24% 29% 16% 3	844
June	1st to 10th	Day	24% 4 22% 29% 16% 6%	780
	11th to 20th	Day	18% 5% 23% 29% 19% 6%	780
	21st to end	Day	18% 5% 21% 30% 18% 8%	780
July	1st to 10th	Day	17% 5% 20% 29% 23% 7%	722
	11th to 20th	Day	17% 4 23% 33% 17% 7%	718
	21st to end	Day	18% 4 19% 28% 22% 10%	794
August	1st to 10th	Day	19% 5% 16% 30% 21% 9%	726
	11th to 20th	Day	19% 5% 17% 28% 22% 9%	715
	21st to end	Day	24% 5% 18% 25% 22% 6%	598
September	1st to 10th	Day	28% 6% 24% 26% 13% 3	530
	11th to 20th	Day	24% 7% 22% 27% 15% 5%	530
	21st to end	Day	26% 5% 26% 23% 15% 4	530
October	1st to 10th	Day	26% 9% 29% 24% 11% 2	400
	11th to 20th	Day	32% 10% 25% 19% 10% 5%	330
	21st to end	Day	26% 10% 27% 24% 10% 3	363
November	1st to 10th	Day	26% 10% 32% 21% 10% 1	305
	11th to 20th	Day	24% 7% 28% 27% 13% 1	220
	21st to end	Day	28% 10% 29% 21% 7% 5%	220
December	1st to 10th	Day	13% 6% 29% 37% 13% 2	220
	11th to 20th	Day	12% 9% 32% 34% 12% 2	220
	21st to end	Day	14% 6% 24% 36% 14% 6%	242
January	1st to 10th	Night	13% 6% 28% 37% 14% 2	1050
	11th to 20th	Night	14% 6% 27% 34% 15% 4	1050
	21st to end	Night	11% 5% 22% 37% 21% 4	1155
February	1st to 10th	Night	7% 5% 30% 36% 21% 1	1050
	11th to 20th	Night	10% 4 25% 37% 20% 4	1018
	21st to end	Night	9% 3 24% 37% 21% 6%	692
March	1st to 10th	Night	10% 4 26% 37% 18% 3	840
	11th to 20th	Night	13% 5% 34% 35% 12% 2	840
	21st to end	Night	14% 6% 25% 35% 16% 3	714
April	1st to 10th	Night	14% 6% 24% 38% 15% 2	630
	11th to 20th	Night	17% 5% 25% 36% 15% 2	623
	21st to end	Night	18% 3 27% 34% 17% 2	630
May	1st to 10th	Night	20% 5% 25% 34% 15% 1	630
	11th to 20th	Night	22% 6% 27% 34% 11%	450
	21st to end	Night	26% 4 23% 35% 11%	455
June	1st to 10th	Night	22% 3 29% 35% 10% 1	420
	11th to 20th	Night	21% 4 24% 35% 15% 1	420
	21st to end	Night	17% 5% 24% 38% 13% 3	420
July	1st to 10th	Night	17% 4 20% 41% 18% 1	390
	11th to 20th	Night	16% 3 22% 42% 17% 1	388
	21st to end	Night	14% 3 18% 39% 24% 3	580
August	1st to 10th	Night	22% 4 13% 41% 18% 1	597
	11th to 20th	Night	19% 4 18% 35% 22% 2	594
	21st to end	Night	20% 4 19% 40% 15% 1	660
September	1st to 10th	Night	20% 5% 22% 40% 12% 2	600
	11th to 20th	Night	27% 7% 22% 32% 10% 1	688
	21st to end	Night	27% 5% 25% 30% 13% 1	800
October	1st to 10th	Night	36% 9% 24% 24% 8% 1	800
	11th to 20th	Night	32% 8% 22% 24% 13% 2	800
	21st to end	Night	29% 8% 24% 27% 11% 1	880
November	1st to 10th	Night	30% 9% 28% 22% 10% 1	921
	11th to 20th	Night	28% 6% 27% 28% 11%	1050
	21st to end	Night	26% 9% 30% 25% 8% 2	1050
December	1st to 10th	Night	16% 8% 32% 31% 12% 2	1050
	11th to 20th	Night	15% 5% 29% 32% 16% 3	1050
	21st to end	Night	19% 5% 25% 31% 15% 5%	1155

Page generated at 2026-06-28 02:10:44. Version ac07

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