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 2024-02-05.

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	15% 11% 5% 9% 7% 4 6% 6% 6% 7% 25%	77544
	Night	13% 13% 5% 10% 8% 5% 7% 6% 6% 6% 21%	81343
Transparency	Day	58% 3 11% 20% 8% 1	77222
	Night	63% 3 10% 17% 6%	81199
Seeing	Day	20% 5% 23% 29% 18% 6%	14621
	Night	20% 5% 25% 33% 15% 2	24060

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	6% 10% 7% 15% 14% 8% 10% 7% 9% 5% 9%	1899
	11th to 20th	Day	5% 10% 5% 14% 14% 7% 10% 10% 9% 6% 10%	2220
	21st to end	Day	14% 17% 6% 13% 8% 5% 6% 6% 7% 7% 10%	2783
February	1st to 10th	Day	2 10% 7% 10% 8% 6% 12% 12% 9% 8% 15%	1472
	11th to 20th	Day	5% 12% 4 9% 10% 6% 7% 9% 10% 7% 20%	1475
	21st to end	Day	3 9% 4 10% 7% 6% 9% 10% 11% 9% 23%	1480
March	1st to 10th	Day	7% 10% 5% 10% 11% 6% 8% 7% 6% 7% 24%	1798
	11th to 20th	Day	7% 12% 5% 8% 10% 4 8% 6% 7% 8% 25%	1844
	21st to end	Day	11% 10% 3 9% 8% 6% 6% 6% 6% 7% 27%	2371
April	1st to 10th	Day	11% 10% 6% 10% 8% 6% 6% 6% 5% 5% 26%	2160
	11th to 20th	Day	12% 12% 5% 7% 8% 4 4 4 5% 7% 32%	2276
	21st to end	Day	11% 10% 5% 7% 6% 4 6% 4 5% 7% 35%	2448
May	1st to 10th	Day	16% 13% 4 10% 7% 4 4 5% 5% 7% 26%	2520
	11th to 20th	Day	19% 9% 4 6% 6% 2 5% 5% 5% 6% 33%	2624
	21st to end	Day	21% 8% 4 6% 5% 4 5% 4 5% 7% 31%	2919
June	1st to 10th	Day	20% 9% 4 5% 6% 3 5% 5% 6% 7% 31%	2848
	11th to 20th	Day	16% 6% 3 6% 6% 4 5% 6% 5% 7% 36%	2880
	21st to end	Day	16% 6% 3 5% 7% 4 5% 6% 6% 8% 35%	2880
July	1st to 10th	Day	15% 5% 3 6% 6% 4 6% 6% 8% 9% 34%	2880
	11th to 20th	Day	14% 6% 3 6% 6% 3 6% 6% 7% 7% 37%	2836
	21st to end	Day	17% 6% 3 5% 5% 3 5% 5% 6% 9% 37%	2810
August	1st to 10th	Day	16% 6% 3 6% 6% 4 5% 5% 6% 7% 36%	2507
	11th to 20th	Day	19% 6% 2 6% 6% 3 5% 5% 6% 8% 32%	2479
	21st to end	Day	19% 8% 3 6% 6% 3 4 5% 7% 8% 31%	2561
September	1st to 10th	Day	22% 10% 2 7% 6% 3 5% 5% 5% 6% 30%	2160
	11th to 20th	Day	26% 10% 4 8% 5% 3 5% 5% 5% 6% 24%	2063
	21st to end	Day	22% 13% 5% 6% 5% 3 4 4 4 6% 29%	1980
October	1st to 10th	Day	25% 16% 5% 9% 5% 4 4 3 3 5% 21%	1860
	11th to 20th	Day	24% 23% 5% 9% 6% 3 5% 3 3 4 14%	1620
	21st to end	Day	22% 23% 8% 11% 8% 2 4 4 4 4 11%	1782
November	1st to 10th	Day	19% 21% 10% 13% 8% 4 5% 3 4 3 11%	1536
	11th to 20th	Day	19% 19% 8% 14% 12% 5% 5% 3 3 4 8%	1330
	21st to end	Day	17% 20% 7% 18% 11% 5% 5% 4 3 4 7%	1330
December	1st to 10th	Day	8% 17% 9% 13% 12% 4 6% 6% 6% 5% 12%	1330
	11th to 20th	Day	6% 14% 7% 12% 9% 5% 11% 8% 7% 6% 16%	1493
	21st to end	Day	11% 14% 7% 11% 11% 5% 7% 5% 6% 7% 16%	2090
January	1st to 10th	Night	6% 14% 7% 15% 10% 7% 11% 9% 8% 5% 8%	5057
	11th to 20th	Night	5% 11% 8% 16% 13% 8% 9% 9% 9% 4 7%	4743
	21st to end	Night	9% 17% 9% 16% 10% 6% 8% 7% 5% 4 10%	4884
February	1st to 10th	Night	4 7% 6% 11% 11% 7% 14% 11% 7% 6% 16%	2583
	11th to 20th	Night	5% 11% 6% 10% 8% 5% 9% 10% 9% 8% 19%	2370
	21st to end	Night	3 9% 5% 8% 8% 6% 10% 11% 8% 7% 24%	1776
March	1st to 10th	Night	6% 10% 4 10% 8% 6% 9% 8% 6% 6% 27%	2149
	11th to 20th	Night	8% 11% 4 10% 8% 6% 8% 6% 5% 8% 27%	2115
	21st to end	Night	11% 10% 3 7% 7% 5% 6% 6% 6% 7% 33%	1998
April	1st to 10th	Night	12% 14% 4 7% 8% 4 5% 5% 5% 6% 29%	1800
	11th to 20th	Night	11% 11% 5% 8% 7% 4 5% 6% 5% 6% 32%	1633
	21st to end	Night	11% 10% 3 7% 6% 4 4 4 6% 7% 37%	1510
May	1st to 10th	Night	16% 11% 5% 9% 7% 3 5% 5% 5% 7% 29%	1440
	11th to 20th	Night	19% 7% 3 6% 7% 3 4 4 6% 6% 35%	1271
	21st to end	Night	22% 9% 3 6% 5% 3 5% 5% 5% 7% 29%	1357
June	1st to 10th	Night	18% 8% 4 5% 6% 3 4 6% 5% 6% 34%	1108
	11th to 20th	Night	19% 4 3 6% 5% 4 5% 5% 5% 7% 36%	1080
	21st to end	Night	16% 6% 2 5% 7% 4 4 6% 6% 8% 38%	1080
July	1st to 10th	Night	15% 6% 3 6% 6% 4 6% 6% 6% 8% 34%	1080
	11th to 20th	Night	14% 5% 3 6% 6% 4 5% 6% 6% 7% 37%	1124
	21st to end	Night	12% 6% 3 5% 6% 5% 6% 5% 7% 8% 36%	1505
August	1st to 10th	Night	18% 7% 2 5% 4 3 5% 5% 6% 7% 38%	1432
	11th to 20th	Night	16% 6% 2 5% 5% 3 5% 5% 6% 8% 38%	1422
	21st to end	Night	16% 9% 3 5% 5% 4 5% 4 7% 7% 34%	1794
September	1st to 10th	Night	16% 8% 3 6% 7% 4 4 4 5% 6% 37%	1800
	11th to 20th	Night	22% 10% 4 7% 6% 3 5% 5% 5% 6% 27%	1878
	21st to end	Night	22% 10% 3 5% 5% 4 5% 4 5% 7% 29%	1980
October	1st to 10th	Night	27% 16% 3 6% 5% 3 3 4 4 5% 23%	2097
	11th to 20th	Night	24% 19% 6% 9% 6% 4 5% 4 5% 4 15%	2340
	21st to end	Night	20% 20% 8% 10% 7% 4 5% 5% 4 5% 13%	2574
November	1st to 10th	Night	22% 20% 8% 12% 9% 4 4 3 3 3 11%	2537
	11th to 20th	Night	18% 18% 9% 14% 12% 4 5% 4 4 4 9%	2850
	21st to end	Night	15% 22% 8% 16% 9% 5% 6% 4 3 4 10%	2850
December	1st to 10th	Night	10% 17% 8% 14% 12% 6% 7% 6% 5% 3 12%	2850
	11th to 20th	Night	9% 14% 6% 12% 11% 7% 8% 7% 6% 5% 15%	3699
	21st to end	Night	10% 13% 5% 12% 10% 6% 7% 6% 6% 6% 19%	5577

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	72% 2 10% 13% 3	1900
	11th to 20th	Day	71% 2 10% 15% 2	2220
	21st to end	Day	73% 2 5% 15% 5%	2783
February	1st to 10th	Day	60% 6% 8% 18% 9%	1472
	11th to 20th	Day	57% 3 10% 21% 9%	1483
	21st to end	Day	50% 5% 12% 20% 13%	1480
March	1st to 10th	Day	58% 3 9% 20% 9%	1800
	11th to 20th	Day	56% 3 11% 21% 6% 1	1844
	21st to end	Day	56% 3 7% 21% 11% 2	2371
April	1st to 10th	Day	59% 3 8% 18% 11%	2160
	11th to 20th	Day	53% 2 7% 26% 11% 1	2276
	21st to end	Day	50% 2 7% 23% 17% 1	2448
May	1st to 10th	Day	59% 2 9% 21% 7% 2	2520
	11th to 20th	Day	52% 3 8% 23% 13% 1	2628
	21st to end	Day	53% 3 7% 24% 12% 1	2919
June	1st to 10th	Day	52% 3 8% 24% 12% 1	2848
	11th to 20th	Day	47% 4 9% 25% 14% 1	2880
	21st to end	Day	47% 4 13% 23% 12% 2	2880
July	1st to 10th	Day	44% 3 15% 30% 8%	2801
	11th to 20th	Day	44% 4 15% 28% 8% 1	2749
	21st to end	Day	45% 4 18% 26% 7%	2654
August	1st to 10th	Day	47% 3 19% 25% 6%	2492
	11th to 20th	Day	50% 3 17% 24% 5%	2479
	21st to end	Day	50% 5% 19% 19% 6% 1	2561
September	1st to 10th	Day	56% 3 15% 19% 7%	2160
	11th to 20th	Day	62% 3 12% 19% 3	2063
	21st to end	Day	58% 3 15% 17% 7%	1980
October	1st to 10th	Day	69% 2 11% 14% 5%	1860
	11th to 20th	Day	76% 3 9% 10% 3	1620
	21st to end	Day	78% 3 9% 8% 2	1782
November	1st to 10th	Day	80% 3 7% 8% 1	1536
	11th to 20th	Day	83% 3 7% 6% 1	1330
	21st to end	Day	82% 4 5% 8% 1	1330
December	1st to 10th	Day	72% 4 8% 11% 4	1330
	11th to 20th	Day	67% 3 6% 14% 9%	1493
	21st to end	Day	68% 2 8% 14% 8% 1	2090
January	1st to 10th	Night	74% 2 11% 11% 2	5057
	11th to 20th	Night	74% 3 11% 10% 2	4743
	21st to end	Night	77% 2 4 12% 4	4884
February	1st to 10th	Night	64% 5% 9% 16% 6%	2583
	11th to 20th	Night	57% 4 11% 22% 6%	2372
	21st to end	Night	54% 4 11% 20% 10% 1	1776
March	1st to 10th	Night	55% 4 11% 19% 10%	2160
	11th to 20th	Night	56% 3 11% 22% 8% 1	2116
	21st to end	Night	50% 3 8% 23% 15% 1	1998
April	1st to 10th	Night	56% 3 6% 21% 14%	1800
	11th to 20th	Night	54% 3 6% 23% 12% 1	1633
	21st to end	Night	46% 3 8% 23% 19% 2	1510
May	1st to 10th	Night	55% 4 7% 25% 8% 1	1440
	11th to 20th	Night	50% 3 5% 21% 18% 2	1272
	21st to end	Night	54% 4 8% 20% 12% 1	1358
June	1st to 10th	Night	52% 3 7% 25% 13% 1	1108
	11th to 20th	Night	47% 4 8% 26% 14% 1	1080
	21st to end	Night	44% 3 10% 29% 13% 1	1080
July	1st to 10th	Night	47% 4 13% 25% 11%	1050
	11th to 20th	Night	43% 5% 14% 29% 8% 1	1088
	21st to end	Night	44% 4 18% 26% 7%	1421
August	1st to 10th	Night	45% 4 21% 25% 5%	1423
	11th to 20th	Night	43% 5% 20% 27% 5%	1422
	21st to end	Night	49% 4 18% 24% 6%	1794
September	1st to 10th	Night	48% 3 17% 24% 7% 1	1800
	11th to 20th	Night	58% 4 15% 21% 3	1878
	21st to end	Night	55% 4 16% 18% 7%	1980
October	1st to 10th	Night	65% 3 13% 16% 3	2097
	11th to 20th	Night	73% 3 11% 11% 2	2340
	21st to end	Night	75% 4 9% 10% 2	2574
November	1st to 10th	Night	79% 3 7% 8% 2	2537
	11th to 20th	Night	80% 3 9% 7% 1	2850
	21st to end	Night	82% 2 7% 8% 2	2850
December	1st to 10th	Night	75% 4 8% 11% 3	2850
	11th to 20th	Night	68% 4 7% 15% 5%	3698
	21st to end	Night	65% 2 7% 20% 6%	5577

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	12% 1 31% 40% 14% 2	180
	11th to 20th	Day	10% 4 26% 32% 21% 7%	219
	21st to end	Day	18% 4 17% 30% 24% 8%	297
February	1st to 10th	Day	4 5% 26% 39% 22% 4	252
	11th to 20th	Day	7% 3 38% 30% 15% 7%	240
	21st to end	Day	4 4 27% 39% 21% 5%	198
March	1st to 10th	Day	12% 4 21% 32% 22% 10%	240
	11th to 20th	Day	11% 5% 30% 33% 16% 5%	284
	21st to end	Day	16% 5% 24% 28% 19% 7%	462
April	1st to 10th	Day	14% 6% 28% 30% 17% 5%	420
	11th to 20th	Day	22% 5% 24% 25% 18% 6%	412
	21st to end	Day	17% 4 23% 28% 20% 7%	528
May	1st to 10th	Day	25% 5% 23% 25% 17% 5%	603
	11th to 20th	Day	22% 5% 25% 28% 14% 5%	625
	21st to end	Day	23% 6% 25% 29% 15% 2	679
June	1st to 10th	Day	26% 4 20% 28% 17% 6%	630
	11th to 20th	Day	18% 4 23% 29% 19% 7%	630
	21st to end	Day	19% 5% 21% 31% 18% 7%	630
July	1st to 10th	Day	17% 4 19% 30% 22% 6%	621
	11th to 20th	Day	17% 3 21% 33% 18% 8%	618
	21st to end	Day	19% 3 18% 28% 22% 10%	684
August	1st to 10th	Day	19% 5% 15% 30% 22% 9%	626
	11th to 20th	Day	20% 5% 17% 28% 22% 8%	615
	21st to end	Day	26% 4 18% 26% 21% 5%	509
September	1st to 10th	Day	27% 7% 25% 26% 12% 4	450
	11th to 20th	Day	26% 7% 22% 26% 16% 4	450
	21st to end	Day	28% 5% 25% 23% 15% 4	450
October	1st to 10th	Day	26% 9% 28% 22% 13% 3	334
	11th to 20th	Day	34% 9% 21% 19% 11% 7%	270
	21st to end	Day	28% 10% 25% 23% 11% 3	297
November	1st to 10th	Day	26% 11% 31% 20% 11% 2	250
	11th to 20th	Day	24% 6% 27% 29% 13% 1	180
	21st to end	Day	28% 8% 27% 23% 8% 6%	180
December	1st to 10th	Day	14% 4 28% 36% 14% 3	180
	11th to 20th	Day	12% 8% 29% 34% 14% 2	180
	21st to end	Day	14% 6% 24% 34% 16% 7%	198
January	1st to 10th	Night	14% 5% 27% 37% 14% 2	950
	11th to 20th	Night	15% 6% 27% 33% 14% 4	950
	21st to end	Night	12% 5% 22% 36% 21% 4	1045
February	1st to 10th	Night	7% 4 29% 37% 22% 1	923
	11th to 20th	Night	11% 4 26% 36% 19% 4	870
	21st to end	Night	8% 2 24% 36% 23% 7%	592
March	1st to 10th	Night	11% 4 25% 36% 20% 4	720
	11th to 20th	Night	13% 6% 34% 34% 12% 2	720
	21st to end	Night	15% 5% 27% 33% 16% 4	612
April	1st to 10th	Night	16% 7% 24% 38% 13% 2	540
	11th to 20th	Night	15% 5% 23% 38% 16% 2	533
	21st to end	Night	17% 2 26% 34% 18% 3	540
May	1st to 10th	Night	21% 6% 25% 34% 14% 1	540
	11th to 20th	Night	23% 6% 28% 33% 11%	386
	21st to end	Night	28% 4 23% 34% 11%	389
June	1st to 10th	Night	22% 3 29% 34% 11% 1	360
	11th to 20th	Night	22% 5% 23% 34% 15% 1	360
	21st to end	Night	18% 4 24% 40% 13% 2	360
July	1st to 10th	Night	18% 3 21% 40% 17% 1	350
	11th to 20th	Night	16% 3 22% 40% 18% 1	348
	21st to end	Night	14% 2 17% 39% 24% 3	521
August	1st to 10th	Night	22% 3 13% 42% 18% 1	537
	11th to 20th	Night	19% 4 19% 35% 22% 2	534
	21st to end	Night	21% 4 19% 39% 16% 1	594
September	1st to 10th	Night	19% 4 22% 40% 12% 2	540
	11th to 20th	Night	30% 7% 22% 29% 10% 1	618
	21st to end	Night	28% 4 25% 30% 13%	720
October	1st to 10th	Night	36% 8% 22% 24% 9% 1	720
	11th to 20th	Night	33% 7% 20% 24% 13% 2	720
	21st to end	Night	30% 8% 25% 25% 11% 1	792
November	1st to 10th	Night	32% 9% 26% 21% 11% 1	831
	11th to 20th	Night	28% 6% 27% 28% 11%	950
	21st to end	Night	25% 9% 29% 26% 9% 2	950
December	1st to 10th	Night	17% 8% 32% 29% 12% 2	950
	11th to 20th	Night	15% 5% 28% 32% 17% 3	950
	21st to end	Night	19% 4 24% 31% 17% 5%	1045

Page generated at 2024-02-02 05:20:30. Version ac07

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