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 2025-02-25.

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	14% 11% 4 10% 6% 6% 5% 4 6% 7% 27%	108280
	Night	12% 13% 5% 12% 7% 7% 6% 5% 6% 6% 21%	110589
Transparency	Day	56% 3 11% 22% 8%	111638
	Night	63% 3 9% 18% 7%	115393
Seeing	Day	20% 5% 23% 29% 18% 6%	16028
	Night	19% 5% 25% 33% 15% 2	25475

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 16% 7% 18% 11% 9% 7% 5% 7% 6% 10%	2719
	11th to 20th	Day	4 11% 6% 19% 11% 11% 11% 7% 8% 4 7%	3172
	21st to end	Day	10% 13% 6% 15% 8% 6% 7% 6% 10% 7% 12%	3982
February	1st to 10th	Day	3 12% 5% 11% 9% 9% 11% 9% 9% 8% 14%	1600
	11th to 20th	Day	5% 11% 4 11% 9% 8% 7% 8% 10% 8% 19%	1643
	21st to end	Day	3 10% 4 11% 7% 8% 9% 8% 10% 9% 22%	1610
March	1st to 10th	Day	5% 11% 4 11% 10% 8% 7% 6% 8% 7% 23%	3118
	11th to 20th	Day	8% 16% 6% 15% 10% 7% 6% 4 5% 5% 17%	3246
	21st to end	Day	10% 17% 5% 10% 7% 7% 6% 6% 6% 6% 18%	4160
April	1st to 10th	Day	10% 11% 5% 11% 7% 7% 6% 5% 6% 6% 27%	2280
	11th to 20th	Day	12% 13% 4 9% 6% 5% 4 3 5% 7% 31%	2404
	21st to end	Day	12% 10% 4 8% 6% 6% 5% 4 6% 7% 34%	2584
May	1st to 10th	Day	13% 12% 4 10% 6% 5% 5% 4 5% 7% 31%	4428
	11th to 20th	Day	19% 10% 4 7% 5% 4 5% 4 5% 6% 32%	4670
	21st to end	Day	22% 7% 3 6% 3 4 4 3 4 7% 37%	5185
June	1st to 10th	Day	20% 9% 3 6% 5% 4 5% 4 6% 7% 30%	3007
	11th to 20th	Day	16% 7% 2 6% 6% 6% 5% 4 6% 7% 35%	3040
	21st to end	Day	15% 7% 2 6% 6% 5% 5% 5% 6% 8% 35%	3040
July	1st to 10th	Day	13% 5% 2 6% 4 5% 5% 4 7% 8% 41%	5070
	11th to 20th	Day	14% 7% 3 7% 4 5% 5% 4 6% 7% 39%	4987
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 4 7% 9% 39%	4923
August	1st to 10th	Day	19% 5% 2 6% 4 5% 5% 4 6% 7% 37%	4423
	11th to 20th	Day	12% 5% 2 5% 4 4 4 3 5% 7% 48%	4356
	21st to end	Day	14% 6% 2 6% 5% 4 4 3 7% 8% 40%	4491
September	1st to 10th	Day	21% 10% 2 8% 4 4 5% 4 5% 6% 30%	2280
	11th to 20th	Day	25% 10% 4 9% 5% 4 5% 4 5% 6% 25%	2177
	21st to end	Day	21% 14% 4 6% 4 4 4 3 4 6% 30%	2090
October	1st to 10th	Day	25% 17% 4 9% 4 5% 4 3 4 5% 20%	1962
	11th to 20th	Day	23% 22% 5% 10% 5% 5% 4 3 3 5% 15%	1710
	21st to end	Day	21% 23% 7% 13% 6% 4 4 3 4 4 11%	1881
November	1st to 10th	Day	18% 23% 9% 14% 6% 6% 4 3 4 3 12%	1618
	11th to 20th	Day	19% 21% 8% 15% 10% 6% 4 3 3 4 8%	1400
	21st to end	Day	16% 22% 6% 19% 9% 5% 5% 3 3 4 7%	1400
December	1st to 10th	Day	6% 17% 9% 18% 9% 7% 8% 4 7% 4 13%	2280
	11th to 20th	Day	6% 15% 8% 16% 7% 7% 9% 5% 7% 6% 15%	2352
	21st to end	Day	13% 16% 7% 14% 7% 6% 6% 4 5% 6% 16%	2992
January	1st to 10th	Night	4 17% 7% 19% 9% 9% 8% 5% 6% 5% 10%	7247
	11th to 20th	Night	3 12% 9% 22% 10% 12% 8% 6% 8% 4 7%	6726
	21st to end	Night	6% 14% 7% 15% 8% 8% 10% 7% 7% 5% 13%	6996
February	1st to 10th	Night	4 9% 6% 13% 9% 9% 13% 8% 7% 5% 15%	2800
	11th to 20th	Night	5% 11% 5% 11% 8% 7% 9% 8% 10% 7% 18%	2641
	21st to end	Night	3 10% 5% 10% 7% 9% 9% 9% 8% 6% 24%	1939
March	1st to 10th	Night	8% 8% 2 9% 9% 9% 8% 6% 7% 6% 27%	3722
	11th to 20th	Night	11% 16% 5% 15% 10% 8% 5% 3 3 5% 18%	3713
	21st to end	Night	12% 14% 4 10% 6% 7% 6% 5% 6% 6% 23%	3498
April	1st to 10th	Night	11% 15% 3 8% 7% 6% 6% 4 5% 6% 30%	1900
	11th to 20th	Night	11% 12% 5% 9% 6% 6% 5% 5% 5% 6% 31%	1724
	21st to end	Night	11% 11% 2 8% 6% 5% 3 4 6% 7% 37%	1593
May	1st to 10th	Night	14% 12% 5% 11% 6% 4 4 3 4 5% 33%	2523
	11th to 20th	Night	19% 10% 3 7% 6% 5% 3 3 5% 6% 32%	2235
	21st to end	Night	21% 8% 3 7% 4 4 4 4 5% 7% 32%	2402
June	1st to 10th	Night	19% 9% 3 6% 5% 4 4 5% 5% 6% 33%	1169
	11th to 20th	Night	18% 5% 3 7% 5% 5% 4 4 6% 7% 37%	1140
	21st to end	Night	15% 7% 2 6% 6% 5% 4 4 6% 8% 37%	1140
July	1st to 10th	Night	13% 6% 2 7% 5% 5% 5% 4 6% 7% 41%	1900
	11th to 20th	Night	14% 6% 2 6% 6% 5% 5% 4 6% 8% 40%	1983
	21st to end	Night	9% 6% 3 7% 5% 5% 5% 4 7% 9% 41%	2638
August	1st to 10th	Night	21% 6% 2 5% 4 4 5% 5% 6% 8% 36%	2517
	11th to 20th	Night	12% 5% 1 4 3 3 3 3 6% 9% 51%	2483
	21st to end	Night	12% 8% 3 6% 4 5% 5% 4 7% 8% 38%	3164
September	1st to 10th	Night	15% 8% 3 7% 6% 5% 4 4 5% 6% 38%	1900
	11th to 20th	Night	21% 11% 4 8% 5% 4 5% 4 5% 6% 29%	1983
	21st to end	Night	21% 10% 3 6% 4 5% 5% 3 5% 6% 30%	2090
October	1st to 10th	Night	27% 16% 3 8% 4 4 3 3 4 5% 23%	2215
	11th to 20th	Night	22% 20% 6% 10% 5% 5% 4 3 5% 4 15%	2470
	21st to end	Night	20% 21% 7% 12% 6% 5% 5% 3 4 5% 13%	2717
November	1st to 10th	Night	20% 21% 8% 13% 7% 6% 4 2 3 4 12%	2675
	11th to 20th	Night	18% 21% 7% 16% 9% 5% 4 3 4 4 9%	3000
	21st to end	Night	15% 24% 8% 17% 8% 6% 5% 3 2 3 9%	3000
December	1st to 10th	Night	6% 18% 8% 18% 11% 8% 7% 5% 6% 3 10%	4910
	11th to 20th	Night	9% 14% 6% 16% 9% 8% 6% 6% 6% 5% 14%	5850
	21st to end	Night	11% 16% 5% 14% 8% 7% 6% 5% 6% 5% 16%	7986

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	73% 2 8% 9% 7% 1	2720
	11th to 20th	Day	77% 2 8% 12% 2	3201
	21st to end	Day	67% 2 7% 17% 8%	3982
February	1st to 10th	Day	62% 5% 9% 17% 8%	1600
	11th to 20th	Day	57% 3 10% 21% 9%	1651
	21st to end	Day	51% 5% 11% 19% 13%	1610
March	1st to 10th	Day	58% 2 8% 21% 11%	3120
	11th to 20th	Day	70% 2 8% 16% 4 1	3246
	21st to end	Day	65% 2 5% 17% 10% 1	4160
April	1st to 10th	Day	57% 3 8% 18% 13%	2280
	11th to 20th	Day	54% 2 7% 25% 11% 1	2404
	21st to end	Day	50% 2 7% 23% 16% 1	2584
May	1st to 10th	Day	56% 1 11% 25% 6% 1	4440
	11th to 20th	Day	54% 2 7% 22% 14% 2	4674
	21st to end	Day	49% 2 8% 29% 11%	5185
June	1st to 10th	Day	53% 3 8% 24% 12% 1	3007
	11th to 20th	Day	47% 4 9% 25% 15% 1	3040
	21st to end	Day	46% 4 13% 24% 12% 2	3040
July	1st to 10th	Day	40% 4 17% 29% 10%	4991
	11th to 20th	Day	43% 5% 15% 31% 6%	4900
	21st to end	Day	41% 5% 20% 30% 5%	4767
August	1st to 10th	Day	46% 4 15% 29% 6%	4408
	11th to 20th	Day	35% 3 12% 38% 11%	4398
	21st to end	Day	41% 4 16% 27% 10%	4490
September	1st to 10th	Day	56% 3 15% 19% 7%	2280
	11th to 20th	Day	62% 4 12% 19% 3	2177
	21st to end	Day	57% 3 14% 18% 7%	2090
October	1st to 10th	Day	70% 4 10% 12% 5%	3248
	11th to 20th	Day	57% 6% 13% 21% 3	2822
	21st to end	Day	71% 4 10% 13% 2	3081
November	1st to 10th	Day	79% 3 8% 9% 1	1618
	11th to 20th	Day	83% 3 7% 6% 2	1400
	21st to end	Day	83% 4 5% 7% 1	1400
December	1st to 10th	Day	73% 3 8% 14% 3	2280
	11th to 20th	Day	69% 3 5% 17% 6%	2352
	21st to end	Day	70% 2 8% 14% 6%	2992
January	1st to 10th	Night	75% 2 8% 9% 5% 1	7247
	11th to 20th	Night	77% 2 9% 10% 2	6772
	21st to end	Night	71% 2 5% 15% 8%	6996
February	1st to 10th	Night	66% 5% 9% 15% 5%	2800
	11th to 20th	Night	58% 4 11% 21% 6%	2643
	21st to end	Night	55% 4 11% 19% 11% 1	1939
March	1st to 10th	Night	55% 3 9% 21% 12%	3733
	11th to 20th	Night	70% 2 9% 15% 4	3714
	21st to end	Night	62% 2 4 21% 10% 1	3498
April	1st to 10th	Night	55% 3 6% 21% 15%	1900
	11th to 20th	Night	54% 3 6% 24% 12% 1	1724
	21st to end	Night	47% 3 8% 24% 18% 2	1593
May	1st to 10th	Night	55% 2 9% 23% 12% 1	2530
	11th to 20th	Night	54% 2 5% 20% 18% 2	2236
	21st to end	Night	52% 2 9% 24% 12%	2403
June	1st to 10th	Night	52% 3 7% 25% 12% 1	1169
	11th to 20th	Night	46% 4 9% 25% 15% 1	1140
	21st to end	Night	44% 3 10% 29% 13% 1	1140
July	1st to 10th	Night	42% 4 15% 31% 8%	1870
	11th to 20th	Night	41% 5% 14% 31% 9% 1	1947
	21st to end	Night	38% 5% 17% 34% 6%	2554
August	1st to 10th	Night	46% 5% 17% 26% 7%	2508
	11th to 20th	Night	30% 3 18% 42% 6%	2507
	21st to end	Night	43% 4 17% 22% 14%	3164
September	1st to 10th	Night	48% 3 17% 25% 7% 1	1900
	11th to 20th	Night	57% 4 15% 22% 2	1983
	21st to end	Night	54% 4 15% 19% 8%	2090
October	1st to 10th	Night	61% 3 12% 18% 5%	3709
	11th to 20th	Night	61% 4 12% 20% 4	4097
	21st to end	Night	74% 5% 7% 11% 4	4467
November	1st to 10th	Night	78% 3 8% 9% 2	2675
	11th to 20th	Night	80% 3 8% 7% 1	3000
	21st to end	Night	83% 2 6% 7% 2	3000
December	1st to 10th	Night	76% 4 8% 10% 2	4910
	11th to 20th	Night	69% 3 8% 16% 4	5849
	21st to end	Night	69% 2 7% 17% 4	7986

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	11% 2 34% 39% 14% 2	200
	11th to 20th	Day	9% 4 28% 30% 22% 7%	244
	21st to end	Day	16% 4 19% 32% 23% 7%	330
February	1st to 10th	Day	8% 5% 25% 38% 21% 4	300
	11th to 20th	Day	6% 3 33% 32% 18% 9%	300
	21st to end	Day	5% 5% 32% 36% 18% 4	237
March	1st to 10th	Day	12% 5% 22% 30% 21% 10%	270
	11th to 20th	Day	12% 4 28% 35% 16% 5%	317
	21st to end	Day	17% 5% 23% 28% 20% 7%	506
April	1st to 10th	Day	12% 6% 26% 31% 18% 7%	460
	11th to 20th	Day	21% 5% 25% 25% 18% 6%	452
	21st to end	Day	18% 3 24% 28% 20% 6%	574
May	1st to 10th	Day	24% 5% 23% 26% 17% 5%	653
	11th to 20th	Day	22% 5% 25% 28% 15% 5%	675
	21st to end	Day	24% 6% 23% 29% 16% 2	734
June	1st to 10th	Day	26% 4 20% 28% 16% 6%	680
	11th to 20th	Day	18% 5% 24% 29% 18% 6%	680
	21st to end	Day	19% 5% 21% 31% 18% 6%	680
July	1st to 10th	Day	18% 4 19% 30% 23% 6%	671
	11th to 20th	Day	16% 3 22% 34% 18% 7%	668
	21st to end	Day	18% 3 18% 27% 23% 11%	739
August	1st to 10th	Day	20% 5% 16% 30% 21% 9%	676
	11th to 20th	Day	19% 4 17% 28% 22% 10%	665
	21st to end	Day	25% 5% 19% 25% 21% 5%	553
September	1st to 10th	Day	26% 6% 25% 27% 13% 3	490
	11th to 20th	Day	25% 7% 22% 27% 15% 4	490
	21st to end	Day	27% 5% 26% 23% 15% 4	490
October	1st to 10th	Day	26% 10% 28% 22% 11% 2	367
	11th to 20th	Day	31% 9% 24% 20% 11% 6%	300
	21st to end	Day	26% 11% 28% 22% 10% 3	330
November	1st to 10th	Day	27% 10% 30% 21% 10% 1	277
	11th to 20th	Day	25% 7% 27% 28% 13% 1	200
	21st to end	Day	30% 8% 28% 23% 7% 6%	200
December	1st to 10th	Day	14% 6% 28% 37% 14% 3	200
	11th to 20th	Day	12% 9% 31% 34% 13% 2	200
	21st to end	Day	15% 5% 24% 36% 14% 6%	220
January	1st to 10th	Night	14% 5% 27% 38% 14% 2	1000
	11th to 20th	Night	15% 6% 27% 34% 15% 4	1000
	21st to end	Night	12% 5% 23% 36% 21% 4	1100
February	1st to 10th	Night	7% 4 30% 36% 22% 1	1000
	11th to 20th	Night	10% 4 25% 37% 20% 4	969
	21st to end	Night	9% 3 24% 36% 21% 6%	647
March	1st to 10th	Night	11% 4 26% 36% 20% 4	760
	11th to 20th	Night	14% 5% 33% 34% 12% 2	760
	21st to end	Night	16% 5% 26% 33% 16% 4	646
April	1st to 10th	Night	16% 6% 24% 38% 14% 2	570
	11th to 20th	Night	15% 5% 24% 37% 16% 2	563
	21st to end	Night	17% 2 27% 34% 18% 2	570
May	1st to 10th	Night	21% 5% 25% 34% 14% 1	570
	11th to 20th	Night	23% 6% 27% 34% 11%	407
	21st to end	Night	28% 4 24% 34% 11%	411
June	1st to 10th	Night	23% 3 28% 34% 11% 1	380
	11th to 20th	Night	21% 4 24% 34% 15% 1	380
	21st to end	Night	17% 4 24% 40% 13% 2	380
July	1st to 10th	Night	18% 3 20% 40% 18% 1	370
	11th to 20th	Night	16% 3 21% 41% 17% 1	368
	21st to end	Night	14% 3 17% 39% 25% 3	551
August	1st to 10th	Night	23% 4 13% 41% 17% 1	567
	11th to 20th	Night	19% 4 18% 34% 23% 2	564
	21st to end	Night	20% 4 19% 39% 16% 1	627
September	1st to 10th	Night	19% 4 22% 41% 13% 2	570
	11th to 20th	Night	29% 8% 23% 30% 9% 1	653
	21st to end	Night	27% 4 25% 31% 12%	760
October	1st to 10th	Night	36% 8% 23% 24% 8% 1	760
	11th to 20th	Night	32% 8% 21% 24% 13% 2	760
	21st to end	Night	30% 8% 25% 25% 11% 1	836
November	1st to 10th	Night	31% 9% 27% 22% 10% 1	876
	11th to 20th	Night	28% 6% 27% 28% 11%	1000
	21st to end	Night	26% 10% 29% 25% 8% 2	1000
December	1st to 10th	Night	17% 8% 32% 31% 12% 2	1000
	11th to 20th	Night	15% 4 28% 33% 17% 3	1000
	21st to end	Night	19% 4 25% 31% 16% 5%	1100

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