Lloydminster
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloydminster clear sky chart from 2005-11-06 to 2025-03-27.

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	9% 9% 3 9% 6% 5% 5% 4 6% 8% 34%	111852
	Night	7% 9% 4 10% 7% 6% 6% 4 6% 8% 34%	116072
Transparency	Day	46% 8% 17% 22% 7%	111593
	Night	47% 7% 16% 21% 8% 1	115977
Seeing	Day	13% 8% 27% 30% 17% 5%	16001
	Night	12% 6% 30% 35% 15% 2	25348

By Month

Percentage Cloud Cover NW (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	5% 11% 4 16% 11% 8% 6% 5% 6% 6% 23%	3179
	11th to 20th	Day	4 8% 3 8% 7% 8% 10% 7% 8% 7% 29%	3159
	21st to end	Day	7% 14% 5% 13% 5% 6% 5% 4 5% 8% 29%	3498
February	1st to 10th	Day	7% 13% 4 15% 8% 6% 6% 5% 7% 7% 23%	1672
	11th to 20th	Day	7% 12% 5% 13% 8% 7% 6% 4 7% 6% 24%	1755
	21st to end	Day	5% 12% 6% 11% 8% 6% 6% 6% 8% 8% 24%	1485
March	1st to 10th	Day	5% 10% 4 9% 7% 6% 7% 6% 9% 9% 26%	3258
	11th to 20th	Day	4 10% 4 13% 5% 4 4 4 8% 10% 33%	3599
	21st to end	Day	8% 11% 5% 15% 7% 6% 4 3 5% 6% 31%	3917
April	1st to 10th	Day	7% 13% 4 9% 7% 5% 5% 4 5% 7% 34%	2351
	11th to 20th	Day	12% 10% 4 9% 6% 5% 6% 4 7% 7% 31%	2440
	21st to end	Day	15% 10% 3 7% 5% 4 5% 4 6% 8% 33%	2553
May	1st to 10th	Day	15% 11% 4 11% 6% 6% 5% 3 5% 5% 29%	4430
	11th to 20th	Day	13% 10% 4 9% 6% 6% 5% 4 6% 6% 30%	4689
	21st to end	Day	12% 9% 3 8% 6% 6% 6% 5% 7% 9% 28%	5161
June	1st to 10th	Day	15% 7% 4 8% 5% 5% 6% 5% 7% 8% 32%	2926
	11th to 20th	Day	20% 9% 3 8% 6% 6% 5% 5% 7% 7% 24%	3040
	21st to end	Day	12% 6% 2 7% 5% 5% 5% 5% 8% 9% 35%	2982
July	1st to 10th	Day	8% 4 2 5% 4 5% 5% 5% 7% 9% 46%	4740
	11th to 20th	Day	8% 5% 2 7% 5% 5% 5% 5% 7% 9% 42%	4740
	21st to end	Day	8% 5% 2 5% 4 4 5% 4 7% 10% 47%	5138
August	1st to 10th	Day	14% 4 2 6% 4 4 4 4 5% 7% 46%	4628
	11th to 20th	Day	8% 5% 2 5% 5% 5% 5% 4 7% 11% 44%	4070
	21st to end	Day	8% 6% 2 7% 4 4 4 4 6% 8% 46%	4521
September	1st to 10th	Day	11% 5% 2 7% 4 5% 5% 4 6% 9% 43%	2347
	11th to 20th	Day	16% 8% 3 7% 3 4 4 3 5% 7% 40%	2199
	21st to end	Day	10% 6% 2 6% 5% 4 4 4 6% 9% 44%	2057
October	1st to 10th	Day	8% 10% 3 8% 4 5% 4 4 6% 8% 42%	3170
	11th to 20th	Day	9% 7% 3 7% 5% 5% 5% 3 7% 10% 39%	3125
	21st to end	Day	6% 9% 4 9% 5% 5% 6% 5% 6% 8% 37%	2854
November	1st to 10th	Day	13% 14% 5% 10% 8% 5% 3 3 6% 7% 26%	1568
	11th to 20th	Day	7% 14% 6% 14% 9% 6% 5% 4 6% 7% 23%	1600
	21st to end	Day	6% 12% 7% 13% 9% 5% 4 3 7% 8% 26%	1400
December	1st to 10th	Day	7% 13% 5% 11% 6% 7% 6% 6% 8% 8% 22%	2003
	11th to 20th	Day	6% 15% 6% 15% 8% 7% 6% 5% 6% 7% 19%	2259
	21st to end	Day	3 7% 4 12% 9% 6% 6% 4 5% 6% 37%	3339
January	1st to 10th	Night	4 8% 5% 14% 10% 9% 8% 6% 9% 6% 20%	6766
	11th to 20th	Night	3 9% 4 10% 9% 7% 8% 6% 7% 9% 27%	6739
	21st to end	Night	6% 12% 4 11% 8% 6% 5% 4 5% 7% 32%	7458
February	1st to 10th	Night	6% 11% 5% 11% 9% 6% 7% 5% 8% 8% 24%	2745
	11th to 20th	Night	5% 10% 4 11% 8% 7% 5% 5% 7% 7% 30%	2532
	21st to end	Night	3 10% 4 11% 8% 7% 6% 4 6% 8% 31%	2145
March	1st to 10th	Night	6% 12% 4 12% 7% 7% 6% 5% 6% 9% 26%	3827
	11th to 20th	Night	4 10% 3 9% 5% 5% 6% 5% 9% 9% 33%	3600
	21st to end	Night	7% 12% 5% 12% 6% 6% 6% 4 6% 8% 29%	3873
April	1st to 10th	Night	6% 9% 4 8% 6% 5% 5% 4 7% 8% 37%	1826
	11th to 20th	Night	9% 9% 4 9% 7% 5% 5% 5% 7% 8% 31%	1691
	21st to end	Night	14% 10% 4 8% 4 4 4 4 6% 8% 35%	1626
May	1st to 10th	Night	17% 10% 4 10% 5% 5% 4 3 5% 6% 29%	2540
	11th to 20th	Night	13% 9% 2 7% 5% 5% 5% 5% 7% 7% 35%	2200
	21st to end	Night	12% 9% 3 10% 6% 5% 6% 5% 7% 7% 28%	2414
June	1st to 10th	Night	11% 7% 3 9% 5% 6% 6% 4 6% 10% 32%	1249
	11th to 20th	Night	19% 10% 3 8% 5% 5% 5% 5% 6% 7% 28%	1140
	21st to end	Night	10% 6% 3 6% 5% 5% 5% 5% 8% 9% 39%	1191
July	1st to 10th	Night	8% 4 1 5% 4 4 5% 4 7% 9% 48%	2220
	11th to 20th	Night	6% 4 2 4 4 4 4 3 6% 7% 57%	2220
	21st to end	Night	7% 4 2 5% 4 3 3 4 6% 9% 55%	2414
August	1st to 10th	Night	11% 5% 1 6% 4 4 5% 4 7% 8% 45%	2305
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 4 7% 10% 46%	2768
	21st to end	Night	8% 5% 2 7% 4 4 4 3 6% 9% 49%	3146
September	1st to 10th	Night	11% 5% 2 6% 4 4 4 4 6% 7% 48%	1833
	11th to 20th	Night	12% 6% 2 5% 5% 4 5% 4 5% 7% 45%	1981
	21st to end	Night	7% 6% 3 6% 4 4 4 4 7% 9% 47%	2122
October	1st to 10th	Night	9% 8% 2 7% 4 4 4 4 5% 8% 44%	3800
	11th to 20th	Night	6% 7% 3 7% 5% 4 4 3 5% 8% 48%	3799
	21st to end	Night	7% 11% 5% 9% 5% 4 5% 4 6% 9% 36%	4673
November	1st to 10th	Night	14% 14% 5% 9% 6% 6% 4 4 5% 7% 27%	2730
	11th to 20th	Night	7% 12% 6% 14% 9% 7% 5% 4 6% 6% 25%	2800
	21st to end	Night	4 13% 6% 14% 7% 6% 5% 4 5% 7% 28%	2995
December	1st to 10th	Night	8% 14% 5% 14% 8% 7% 7% 5% 6% 6% 19%	5173
	11th to 20th	Night	6% 15% 6% 15% 9% 7% 6% 5% 6% 7% 19%	5933
	21st to end	Night	3 7% 3 11% 9% 7% 5% 4 5% 6% 39%	7598

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	61% 6% 9% 19% 5%	3179
	11th to 20th	Day	49% 7% 15% 17% 10% 1	3180
	21st to end	Day	55% 5% 19% 16% 5%	3498
February	1st to 10th	Day	60% 5% 13% 15% 7%	1672
	11th to 20th	Day	56% 7% 13% 15% 8% 1	1764
	21st to end	Day	54% 9% 13% 17% 7%	1485
March	1st to 10th	Day	48% 10% 19% 16% 7%	3258
	11th to 20th	Day	44% 9% 24% 17% 6%	3600
	21st to end	Day	51% 9% 11% 19% 9%	3917
April	1st to 10th	Day	47% 9% 15% 20% 9%	2351
	11th to 20th	Day	49% 8% 14% 20% 8% 1	2440
	21st to end	Day	47% 8% 15% 21% 8% 1	2553
May	1st to 10th	Day	55% 8% 11% 20% 7%	4430
	11th to 20th	Day	47% 10% 13% 20% 9% 1	4693
	21st to end	Day	45% 14% 17% 17% 8%	5162
June	1st to 10th	Day	46% 10% 16% 19% 8% 1	2926
	11th to 20th	Day	55% 10% 13% 16% 5% 1	3040
	21st to end	Day	41% 11% 20% 21% 6%	2982
July	1st to 10th	Day	33% 7% 25% 27% 8%	4666
	11th to 20th	Day	36% 8% 16% 29% 10%	4659
	21st to end	Day	33% 7% 23% 31% 7%	4976
August	1st to 10th	Day	36% 7% 20% 34% 3	4610
	11th to 20th	Day	35% 6% 24% 30% 6%	4110
	21st to end	Day	35% 6% 24% 30% 5%	4520
September	1st to 10th	Day	36% 10% 17% 25% 9% 2	2347
	11th to 20th	Day	43% 7% 18% 27% 6%	2199
	21st to end	Day	36% 8% 17% 28% 9% 2	2057
October	1st to 10th	Day	42% 4 22% 27% 5%	3170
	11th to 20th	Day	40% 4 16% 32% 7%	3125
	21st to end	Day	45% 5% 21% 24% 5%	2854
November	1st to 10th	Day	57% 7% 14% 17% 6%	1568
	11th to 20th	Day	60% 10% 15% 12% 4	1600
	21st to end	Day	55% 9% 16% 17% 4	1400
December	1st to 10th	Day	58% 8% 15% 14% 5% 1	2003
	11th to 20th	Day	63% 7% 13% 14% 3	2260
	21st to end	Day	48% 4 10% 25% 11% 1	3339
January	1st to 10th	Night	59% 6% 15% 13% 7%	6766
	11th to 20th	Night	52% 6% 13% 15% 13% 1	6780
	21st to end	Night	52% 6% 18% 20% 4	7458
February	1st to 10th	Night	55% 7% 12% 16% 9%	2745
	11th to 20th	Night	49% 7% 14% 18% 11%	2533
	21st to end	Night	47% 8% 14% 21% 10%	2145
March	1st to 10th	Night	51% 8% 16% 18% 6%	3827
	11th to 20th	Night	42% 11% 20% 19% 8%	3600
	21st to end	Night	47% 11% 12% 19% 11%	3873
April	1st to 10th	Night	41% 8% 15% 19% 16%	1826
	11th to 20th	Night	47% 8% 15% 18% 11% 2	1691
	21st to end	Night	46% 6% 13% 20% 12% 2	1626
May	1st to 10th	Night	52% 7% 11% 21% 8% 1	2540
	11th to 20th	Night	41% 10% 13% 22% 13% 1	2200
	21st to end	Night	46% 14% 19% 16% 5% 1	2414
June	1st to 10th	Night	45% 10% 15% 21% 8% 1	1249
	11th to 20th	Night	52% 10% 13% 16% 9%	1140
	21st to end	Night	36% 11% 25% 21% 6% 1	1191
July	1st to 10th	Night	31% 7% 26% 23% 12% 1	2185
	11th to 20th	Night	25% 6% 17% 38% 14%	2178
	21st to end	Night	26% 7% 22% 33% 12% 1	2337
August	1st to 10th	Night	35% 8% 22% 32% 3	2298
	11th to 20th	Night	33% 5% 24% 30% 8%	2794
	21st to end	Night	33% 5% 22% 33% 7%	3146
September	1st to 10th	Night	34% 8% 17% 26% 11% 5%	1833
	11th to 20th	Night	38% 8% 16% 29% 8% 1	1981
	21st to end	Night	33% 6% 16% 31% 12% 2	2122
October	1st to 10th	Night	38% 4 21% 30% 6%	3800
	11th to 20th	Night	35% 4 15% 36% 10%	3799
	21st to end	Night	45% 5% 22% 23% 5%	4673
November	1st to 10th	Night	57% 6% 13% 16% 7% 1	2730
	11th to 20th	Night	59% 8% 14% 15% 5%	2800
	21st to end	Night	54% 8% 16% 17% 4	2995
December	1st to 10th	Night	64% 6% 15% 11% 4 1	5173
	11th to 20th	Night	64% 5% 16% 12% 4	5931
	21st to end	Night	46% 5% 12% 22% 14% 2	7598

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% 6% 29% 31% 22% 3	200
	11th to 20th	Day	13% 9% 28% 30% 20% 2	200
	21st to end	Day	14% 12% 33% 28% 10% 3	220
February	1st to 10th	Day	7% 9% 38% 27% 15% 4	247
	11th to 20th	Day	10% 8% 30% 30% 18% 4	300
	21st to end	Day	7% 7% 29% 37% 14% 5%	249
March	1st to 10th	Day	8% 11% 31% 34% 15% 2	410
	11th to 20th	Day	10% 6% 34% 31% 16% 4	500
	21st to end	Day	12% 5% 29% 34% 16% 3	531
April	1st to 10th	Day	9% 10% 33% 33% 11% 3	460
	11th to 20th	Day	15% 8% 31% 29% 13% 4	452
	21st to end	Day	17% 9% 30% 30% 11% 2	543
May	1st to 10th	Day	12% 10% 26% 32% 14% 6%	653
	11th to 20th	Day	11% 9% 25% 31% 18% 7%	675
	21st to end	Day	16% 6% 22% 31% 17% 7%	734
June	1st to 10th	Day	16% 8% 30% 31% 12% 4	680
	11th to 20th	Day	20% 10% 27% 24% 14% 5%	680
	21st to end	Day	12% 5% 23% 29% 22% 9%	680
July	1st to 10th	Day	12% 4 19% 32% 27% 7%	671
	11th to 20th	Day	10% 5% 25% 32% 19% 9%	668
	21st to end	Day	9% 4 21% 31% 25% 9%	739
August	1st to 10th	Day	12% 6% 18% 30% 26% 8%	676
	11th to 20th	Day	10% 6% 21% 32% 23% 7%	507
	21st to end	Day	14% 5% 23% 29% 21% 8%	539
September	1st to 10th	Day	15% 7% 31% 27% 16% 5%	490
	11th to 20th	Day	23% 8% 21% 32% 13% 3	490
	21st to end	Day	12% 14% 27% 31% 14% 2	457
October	1st to 10th	Day	14% 7% 29% 35% 12% 3	300
	11th to 20th	Day	17% 9% 32% 28% 11% 3	300
	21st to end	Day	12% 12% 35% 25% 13% 2	330
November	1st to 10th	Day	16% 9% 30% 30% 13% 2	300
	11th to 20th	Day	13% 9% 44% 24% 10% 1	300
	21st to end	Day	7% 13% 36% 32% 8% 5%	200
December	1st to 10th	Day	8% 7% 31% 31% 18% 6%	200
	11th to 20th	Day	9% 9% 38% 32% 13% 1	200
	21st to end	Day	9% 5% 26% 34% 18% 7%	220
January	1st to 10th	Night	12% 7% 33% 34% 13% 1	1000
	11th to 20th	Night	11% 7% 34% 36% 11% 1	1000
	21st to end	Night	15% 10% 37% 30% 8% 1	1100
February	1st to 10th	Night	8% 7% 29% 38% 16% 2	838
	11th to 20th	Night	10% 5% 34% 32% 17% 2	784
	21st to end	Night	6% 5% 27% 38% 21% 4	660
March	1st to 10th	Night	10% 5% 32% 40% 12% 2	800
	11th to 20th	Night	10% 5% 32% 36% 15% 2	800
	21st to end	Night	13% 6% 27% 35% 15% 3	848
April	1st to 10th	Night	8% 6% 32% 35% 16% 3	570
	11th to 20th	Night	12% 7% 31% 34% 14% 1	563
	21st to end	Night	17% 8% 25% 34% 15% 1	570
May	1st to 10th	Night	12% 8% 28% 33% 18% 1	570
	11th to 20th	Night	12% 4 28% 35% 18% 3	375
	21st to end	Night	18% 4 19% 36% 20% 2	411
June	1st to 10th	Night	12% 8% 26% 35% 16% 2	380
	11th to 20th	Night	24% 6% 22% 28% 17% 3	380
	21st to end	Night	13% 2 19% 36% 27% 3	380
July	1st to 10th	Night	10% 2 18% 45% 24% 1	370
	11th to 20th	Night	11% 3 21% 42% 21% 2	368
	21st to end	Night	7% 5% 17% 42% 25% 5%	416
August	1st to 10th	Night	8% 3 19% 37% 29% 5%	434
	11th to 20th	Night	11% 4 20% 40% 23% 2	564
	21st to end	Night	10% 3 26% 38% 21% 1	627
September	1st to 10th	Night	14% 5% 20% 41% 18% 2	570
	11th to 20th	Night	15% 3 22% 43% 17%	651
	21st to end	Night	9% 6% 33% 36% 16% 1	760
October	1st to 10th	Night	15% 5% 29% 35% 14% 1	760
	11th to 20th	Night	12% 4 34% 34% 13% 2	760
	21st to end	Night	15% 8% 36% 30% 10%	964
November	1st to 10th	Night	20% 6% 33% 31% 9% 1	975
	11th to 20th	Night	13% 8% 33% 31% 13% 3	1000
	21st to end	Night	9% 8% 38% 35% 10% 1	1000
December	1st to 10th	Night	12% 7% 33% 30% 13% 4	1000
	11th to 20th	Night	12% 9% 36% 31% 11% 2	1000
	21st to end	Night	9% 5% 32% 34% 16% 4	1100

Page generated at 2025-03-24 07:04:27. Version ac07

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